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Results of latency test, list of computers tested for use with LinuxCNC
08 Oct 2021 16:27 #222560
by radom
Replied by radom on topic Results of latency test, list of computers tested for use with LinuxCNC
ok, I added isolcpus=1 noirqbalance and it looks like latency is half of what it was before
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29 Oct 2021 07:07 #224630
by zfa
Replied by zfa on topic Results of latency test, list of computers tested for use with LinuxCNC
Hi, my ITX-ASRock880GXH with one onboard Parport and one PCIe Parport:The "GRUB_CMDLINE_LINUX_DEFAULT" I copied from other users in this thread, with the option "nomodeset" I could get rid the graphic driver, with this I got better results for driving a machine with parport.
LinuxCNC pc tests, version 20200930, started 14.10.2021 11:00:13
********************************************************************************
General info:
ASRock, To Be Filled By O.E.M.
Bios version P1.30, dated 05/04/2018
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Celeron(R) J4005 CPU @ 2.00GHz
cpu cores : 2
stepping : 1
cache size : 4096 KB
================================================================================
RAM related data:
Maximum Capacity: 256 GB
Maximum Voltage: 1.5 V
Maximum Voltage: Unknown
Size: 4096 MB
Size: No Module Installed
================================================================================
GPU related data:
product: UHD Graphics 605
configuration: latency=0
================================================================================
Parallel port related data:
number of parallel ports is 2
parport0: PC-style at 0x378, irq 5 [PCSPP]
parport1: PC-style at 0xe010 (0xe000), irq 22 [PCSPP,TRISTATE,EPP]
================================================================================
Os and desktop related data:
PRETTY_NAME="Linux Mint 20.2"
Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency
Desktop environment : lightdm
Windowmanager : Xfwm4
Displaymanager : lightdm
================================================================================
Kernel related data:
Kernel 5.10.0-0.bpo.8-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset isolcpus=1"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Microsoft Microsoft 3-Button Mouse with IntelliEye(TM)
Mice attached to USB:
Microsoft Corp. Wheel Mouse Optical
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.2.52.ga5f8e5cc0
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 60817451
================================================================================
Command for latency test is:
su rb -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee -a 50k.lat &"
Latency testing loop started Thu 14 Oct 2021 11:00:33 AM CEST,
should end after Thu 14 Oct 2021 01:00:33 PM CEST
================================================================================
Swap useage: prerun: 0, running: 0
================================================================================
CPU core temperatures:
Core 0: Tmin: 40.0°C, Tmax: 49.0°C, (high = +105.0°C, crit = +105.0°C)
Core 1: Tmin: 41.0°C, Tmax: 49.0°C, (high = +105.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
7202 secs servo min: -19.300 uS max: 18.000 uS sdev: 0.600 uS
7204 secs base min: -30.000 uS max: 32.400 uS sdev: 1.300 uS
LinuxCNC pc tests, version 20200930, started 27.10.2021 09:11:47
********************************************************************************
General info:
ASRock, To Be Filled By O.E.M.
Bios version P1.30, dated 05/04/2018
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Celeron(R) J4005 CPU @ 2.00GHz
cpu cores : 2
stepping : 1
cache size : 4096 KB
================================================================================
RAM related data:
Maximum Capacity: 256 GB
Maximum Voltage: 1.5 V
Maximum Voltage: Unknown
Size: 4096 MB
Size: No Module Installed
================================================================================
GPU related data:
product: UHD Graphics 605
configuration: latency=0
================================================================================
Parallel port related data:
number of parallel ports is 2
parport0: PC-style at 0x378, irq 5 [PCSPP]
parport1: PC-style at 0xe010 (0xe000), irq 22 [PCSPP,TRISTATE,EPP]
================================================================================
Os and desktop related data:
PRETTY_NAME="Linux Mint 20.2"
Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency
Desktop environment : lightdm
Windowmanager : Xfwm4
Displaymanager : lightdm
================================================================================
Kernel related data:
Kernel 5.10.0-0.bpo.8-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet isolcpus=1 nomodeset mitigations=off intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll acpi_irq_nobalance noirqbalance"
Cpu idle driver: none
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Microsoft Microsoft 3-Button Mouse with IntelliEye(TM)
Mice attached to USB:
Microsoft Corp. Wheel Mouse Optical
Keyboards attached to USB:
Chicony Electronics Co., Ltd KU-0833 Keyboard
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.2.53.gab788522d
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID
================================================================================
Command for latency test is:
su rb -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee -a 50k.lat &"
Latency testing loop started Wed 27 Oct 2021 09:12:07 AM CEST,
should end after Wed 27 Oct 2021 11:12:07 AM CEST
================================================================================
Swap useage: prerun: 0, running: 0
================================================================================
CPU core temperatures:
Core 0: Tmin: 34.0°C, Tmax: 49.0°C, (high = +105.0°C, crit = +105.0°C)
Core 1: Tmin: 34.0°C, Tmax: 49.0°C, (high = +105.0°C, crit = +105.0°C)
================================================================================
last latency data is as follows:.
7203 secs base min: -23.500 uS max: 24.300 uS sdev: 0.300 uS
7203 secs servo min: -15.600 uS max: 16.200 uS sdev: 0.600 uS
The following user(s) said Thank You: seuchato, tommylight
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05 Jan 2022 00:30 #230815
by seuchato
Greez
Chris
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
To me, that looks very good, indeed!Hi, my ITX-ASRock880GXH with one onboard Parport and one PCIe Parport:
... CPU related data: model name : Intel(R) Celeron(R) J4005 CPU @ 2.00GHz ... ================================================================================ Parallel port related data: number of parallel ports is 2 parport0: PC-style at 0x378, irq 5 [PCSPP] parport1: PC-style at 0xe010 (0xe000), irq 22 [PCSPP,TRISTATE,EPP] ================================================================================ Os and desktop related data: PRETTY_NAME="Linux Mint 20.2" ... ================================================================================ Kernel related data: Kernel 5.10.0-0.bpo.8-rt-amd64 GRUB_CMDLINE_LINUX_DEFAULT="quiet splash nomodeset isolcpus=1" Cpu idle driver: intel_idle ================================================================================ ... ================================================================================ Command for latency test is: su rb -c "latency-histogram --bbinsize 1000 --base 50000 --sbinsize 1000 --nox 2>&1 | tee -a 50k.lat &" ... ================================================================================ last latency data is as follows:. 7202 secs servo min: -19.300 uS max: 18.000 uS sdev: 0.600 uS 7204 secs base min: -30.000 uS max: 32.400 uS sdev: 1.300 uS LinuxCNC pc tests, version 20200930, started 27.10.2021 09:11:47 ******************************************************************************** ... ================================================================================ last latency data is as follows:. 7203 secs base min: -23.500 uS max: 24.300 uS sdev: 0.300 uS 7203 secs servo min: -15.600 uS max: 16.200 uS sdev: 0.600 uS
Greez
Chris
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27 Jan 2022 23:16 #233326
by arvidb
Replied by arvidb on topic Results of latency test, list of computers tested for use with LinuxCNC
Another data point:
I got a used Lenovo Thinkcentre M710q Tiny i3-7100T via Ebay thinking it might be a neat LinuxCNC computer.
This is with SpeedStep, Hyper Threading, and audio disabled in BIOS, but with C1E+C3+C6 enabled (disabling these didn't seem to make much of a difference, if any). "Trusted computing", Secure boot, and all the Intel Management stuff is disabled too.
The OS is Debian 11.2 with RT_PREEMP kernel 5.10.0-11-rt-amd64 (installed using packages linux-image-rt-amd64 and linux-headers-rt-amd64). I've installed iwlwifi firmware from non-free repo and WiFi is enabled in BIOS, but was't used during this test.
The test below is without isolcpus; adding isolcpus=1 seems to reduce the latency to about 80 µs.
I also spent some time removing unused kernel modules and re-testing but it made no real difference.
Sorry, only had the patience to run the test for about 20 minutes...
I got a used Lenovo Thinkcentre M710q Tiny i3-7100T via Ebay thinking it might be a neat LinuxCNC computer.
This is with SpeedStep, Hyper Threading, and audio disabled in BIOS, but with C1E+C3+C6 enabled (disabling these didn't seem to make much of a difference, if any). "Trusted computing", Secure boot, and all the Intel Management stuff is disabled too.
The OS is Debian 11.2 with RT_PREEMP kernel 5.10.0-11-rt-amd64 (installed using packages linux-image-rt-amd64 and linux-headers-rt-amd64). I've installed iwlwifi firmware from non-free repo and WiFi is enabled in BIOS, but was't used during this test.
The test below is without isolcpus; adding isolcpus=1 seems to reduce the latency to about 80 µs.
I also spent some time removing unused kernel modules and re-testing but it made no real difference.
Sorry, only had the patience to run the test for about 20 minutes...
LinuxCNC pc tests, version 20200930, started 27.01.2022 23:47:11
********************************************************************************
General info:
LENOVO, 10MR00xxxx
Bios version M1AKT28A, dated 09/13/2017
Chipset: Intel Corporation 200 Series/Z370
Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Core(TM) i3-7100T CPU @ 3.40GHz
cpu cores : 2
stepping : 9
cache size : 3072 KB
================================================================================
RAM related data: (single 8 GiB DDR4 SO-DIMM)
================================================================================
GPU related data:
product: HD Graphics 630
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux 11 (bullseye)"
Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency
Desktop environment : lightdm (actually Xfce4)
Windowmanager : Xfwm4
Displaymanager : lightdm
================================================================================
Kernel related data:
Kernel 5.10.0-11-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet"
Cpu idle driver: intel_idle
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : Microsoft Comfort Optical Mouse 1000
Mice attached to USB:
Microsoft Corp. Comfort Optical Mouse 1000
Keyboards attached to USB:
Elan Microelectronics Corp. ActiveJet K-2024 Multimedia Keyboard
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.9-pre (7b27504b...)
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 65011800
================================================================================
Command for latency test is:
latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee -a 1643323630.lat &
should end after fre 28 jan 2022 01:47:22 CET
Latency testing loop started tor 27 jan 2022 23:47:22 CET,
Manual termination requested at 28.01.2022 00:08:02
================================================================================
Swap useage: prerun: 0, running: 0
================================================================================
CPU core temperatures:
Core 0: Tmin: 41.0°C, Tmax: 58.0°C, (high = +76.0°C, crit = +92.0°C)
Core 1: Tmin: 42.0°C, Tmax: 58.0°C, (high = +76.0°C, crit = +92.0°C)
================================================================================
last latency data is as follows:
1238 s servo min:-117.300 us max: 116.900 us sdev: 11.300 us
1239 s servo min:-117.300 us max: 116.900 us sdev: 11.300 us
The following user(s) said Thank You: seuchato
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27 Jan 2022 23:47 - 27 Jan 2022 23:48 #233327
by arvidb
Replied by arvidb on topic Results of latency test, list of computers tested for use with LinuxCNC
The same system with isolcpus=1 (and noirqbalance, but the latter doesn't seem to make a noticeable difference). The "standard" vimeo video was running, as well as a YouTube video.
Attachments:
Last edit: 27 Jan 2022 23:48 by arvidb.
The following user(s) said Thank You: seuchato, tommylight
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02 Feb 2022 14:17 - 02 Feb 2022 14:36 #233799
by deus
Replied by deus on topic Results of latency test, list of computers tested for use with LinuxCNC
Hi ,I am currently testing my Intel NUC7i5BNH which I plan to use with a MESA 7i76E.
First, I needed to change from nm-tray to network manager as I got a long list of icons on the top right:
sudo apt remove nm-tray
sudo apt install network-manager-gnome
Subsequently, I tried everything under the sun to get the latency down:
I disabled pretty much everything in the BIOS such as CPU related options (power saving, hyper-threading, turbo boost, 1 core only), any devices that are not needed (bluetooth, audio, microphone) and set the energy management to max performance. The only thing that I did not disabled (which I believe may affect latency according to other posts) is cooling, LAN and wireless which I intend to use during operations. But even when I switched them off they didn't seem to have a great impact on the latency.
I also added a long list of grub commands:
GRUB_CMDLINE_LINUX_DEFAULT="quiet transparent_hugepage=never splash mitigations=off isolcpus=1 acpi_irq_nobalance noirqbalance lapic nohlt idle=poll radeon.modeset=0 intel_idle.max_cstate=0 processor.max_cstate=0 ipv6.disable=1 pci=routeirq"
I added 'vm.swappiness=0' to /etc/sysctl.conf
I added 'hardware−irq−coalesce−rx−usecs 0' to /etc/network/interfaces
I used the following command to avoid any sleep modes:
'sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target'
My latest latency data is below!
If anybody has some suggestions to further improve the latency that would be very much appreciated?!
I was also wondering if the below latency numbers are good enough to use the MESA 7i76E board?
In retrospect (considering the results I have seen in this thread), I should have gone for a Dell Optiplex 980 (i5) which would have been a 'hassle-free' to setup with superb latency performance. However, I really like the form factor of the NUC.
Thank you!
First, I needed to change from nm-tray to network manager as I got a long list of icons on the top right:
sudo apt remove nm-tray
sudo apt install network-manager-gnome
Subsequently, I tried everything under the sun to get the latency down:
I disabled pretty much everything in the BIOS such as CPU related options (power saving, hyper-threading, turbo boost, 1 core only), any devices that are not needed (bluetooth, audio, microphone) and set the energy management to max performance. The only thing that I did not disabled (which I believe may affect latency according to other posts) is cooling, LAN and wireless which I intend to use during operations. But even when I switched them off they didn't seem to have a great impact on the latency.
I also added a long list of grub commands:
GRUB_CMDLINE_LINUX_DEFAULT="quiet transparent_hugepage=never splash mitigations=off isolcpus=1 acpi_irq_nobalance noirqbalance lapic nohlt idle=poll radeon.modeset=0 intel_idle.max_cstate=0 processor.max_cstate=0 ipv6.disable=1 pci=routeirq"
I added 'vm.swappiness=0' to /etc/sysctl.conf
I added 'hardware−irq−coalesce−rx−usecs 0' to /etc/network/interfaces
I used the following command to avoid any sleep modes:
'sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target'
My latest latency data is below!
If anybody has some suggestions to further improve the latency that would be very much appreciated?!
I was also wondering if the below latency numbers are good enough to use the MESA 7i76E board?
In retrospect (considering the results I have seen in this thread), I should have gone for a Dell Optiplex 980 (i5) which would have been a 'hassle-free' to setup with superb latency performance. However, I really like the form factor of the NUC.
Thank you!
LinuxCNC pc tests, version 20200930, started 02.02.2022 13:32:31
********************************************************************************
General info:
Intel Corporation, NUC7i5BNH
Bios version BNKBL357.86A.0087.2021.1210.1903, dated 12/10/2021
Chipset: Harddisk is non-rotational, ie. SSD
The amount of swap currently used is 0
================================================================================
CPU related data:
model name : Intel(R) Core(TM) i5-7260U CPU @ 2.20GHz
cpu cores : 1
stepping : 9
cache size : 4096 KB
================================================================================
RAM related data:
Maximum Capacity: 32 GB
Maximum Voltage: 1.2 V
Maximum Voltage: 1.2 V
Size: 8192 MB
Size: 8192 MB
================================================================================
GPU related data:
product: Intel Corporation
configuration: driver=i915 latency=0
================================================================================
Parallel port related data:
number of parallel ports is 0
================================================================================
Os and desktop related data:
PRETTY_NAME="Debian GNU/Linux 10 (buster)"
Should the info below not match with your machine,
kindly post the output of pstree here, including a brief
desciption of your desktop environment, window manager and
display manager. Tia
https://forum.linuxcnc.org/18-computer/39370-script-for-automated-testing-of-computer-latency
Desktop environment : xfce4
Windowmanager : Xfwm4
Displaymanager : lightdm
================================================================================
Kernel related data:
Kernel 4.19.0-18-rt-amd64
GRUB_CMDLINE_LINUX_DEFAULT="quiet transparent_hugepage=never splash mitigations=off isolcpus=1 acpi_irq_nobalance noirqbalance lapic nohlt idle=poll radeon.modeset=0 intel_idle.max_cstate=0 processor.max_cstate=0 ipv6.disable=1 pci=routeirq"
Cpu idle driver: none
================================================================================
Kernel modules data:
Check if pcspkr is loaded: No, which is good!
Check if snd modules are loaded: No, which is good!
================================================================================
Keyboard & Mouse related data:
Number of mice: 1
Mouse 0 : HP HP USB 1000dpi Laser Mouse
Mice attached to USB:
HP, Inc HID-compliant mouse
Keyboards attached to USB:
================================================================================
LinuxCNC related data:
LinuxCNC version is: 2.8.2.11.g6a3d0a434
================================================================================
Preparing for latency test:
Started glxgears No. 1, 2, 3, 4, 5
..........
Started firefox with 'https://vimeo.com/150574260', WID 50331651
================================================================================
Command for latency test is:
su cnc -c "latency-histogram --nobase --sbinsize 1000 --nox 2>&1 | tee -a 1643779951.lat &"
Latency testing loop started Wed 2 Feb 13:32:44 AWST 2022,
should end after Wed 2 Feb 15:32:44 AWST 2022
================================================================================
Swap useage: prerun: 0, running: 0
================================================================================
CPU core temperatures:
Core 0: Tmin: 49.0°C, Tmax: 55.0°C, (high = +100.0°C, crit = +100.0°C)
================================================================================
last latency data is as follows:.
7204 secs servo min: -83.700 uS max: 86.400 uS sdev: 4.800 uS
7205 secs servo min: -83.700 uS max: 86.400 uS sdev: 4.800 uS
Last edit: 02 Feb 2022 14:36 by deus.
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02 Feb 2022 15:56 #233811
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Hi deus
But, honestly, I think the latency figures you get should be OK with ethernet based cards. I guess tommylight can give you a much more quilified answer, as I have not received my mesa cards to date.
Greez
chris
I think these are a LOT of options. I am not sure if one might bite the other. In order to rule out any bad influence by changing/adding just on option at a time, run the test and record the numbers along with a protocol of what you have changed. Guess that will keep you busy for quite a whileGRUB_CMDLINE_LINUX_DEFAULT="quiet transparent_hugepage=never splash mitigations=off isolcpus=1 acpi_irq_nobalance noirqbalance lapic nohlt idle=poll radeon.modeset=0 intel_idle.max_cstate=0 processor.max_cstate=0 ipv6.disable=1 pci=routeirq"
I added 'vm.swappiness=0' to /etc/sysctl.conf
I added 'hardware−irq−coalesce−rx−usecs 0' to /etc/network/interfaces
I used the following command to avoid any sleep modes:
'sudo systemctl mask sleep.target suspend.target hibernate.target hybrid-sleep.target'
But, honestly, I think the latency figures you get should be OK with ethernet based cards. I guess tommylight can give you a much more quilified answer, as I have not received my mesa cards to date.
Greez
chris
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02 Feb 2022 16:51 #233813
by arvidb
This is probably a bad idea. The swappiness parameter sets the ratio between file page and anonymous page reclamation. Probably not what you wanted.
Read more here if you want: www.howtogeek.com/449691/what-is-swapine...nd-how-to-change-it/
Replied by arvidb on topic Results of latency test, list of computers tested for use with LinuxCNC
I added 'vm.swappiness=0' to /etc/sysctl.conf
This is probably a bad idea. The swappiness parameter sets the ratio between file page and anonymous page reclamation. Probably not what you wanted.
Read more here if you want: www.howtogeek.com/449691/what-is-swapine...nd-how-to-change-it/
The following user(s) said Thank You: seuchato
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02 Feb 2022 20:01 #233829
by seuchato
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
arvidb
Thx for the link. Read it once, will have to read it again, probably various times.
Greez
chris
Thx for the link. Read it once, will have to read it again, probably various times.
Greez
chris
The following user(s) said Thank You: arvidb
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02 Feb 2022 20:18 - 02 Feb 2022 20:23 #233833
by seuchato
I have question regarding the MoBo:
remark to myself: have to add code in the script to depict as closely as possible the MoBo manufacturer and model
Greez
chris
PS: could it be this Mobo ?
Replied by seuchato on topic Results of latency test, list of computers tested for use with LinuxCNC
Hi, my ITX-ASRock880GXH with one onboard Parport and one PCIe Parport:
... ================================================================================ CPU related data: model name : Intel(R) Celeron(R) J4005 CPU @ 2.00GHz cpu cores : 2 stepping : 1 cache size : 4096 KB ...
I have question regarding the MoBo:
- 880GXH suggests, the MoBo is for an AMD based one, see hereffff
- But that cannot be, as far as I know, an Intel CPU would probably ieek itself out of an AMD socket ("Intel(R) Celeron(R) J4005 CPU @ 2.00GHz")
remark to myself: have to add code in the script to depict as closely as possible the MoBo manufacturer and model
Greez
chris
PS: could it be this Mobo ?
Last edit: 02 Feb 2022 20:23 by seuchato. Reason: typos and link to intel MoBo
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