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Old 10-05-2009, 04:21 PM   #1
fmyhr
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How to find and display RAM frequency and timings?


Hi,

I want to verify the speed and timings of installed RAM from within Linux. In Windows, this is easily done with CPU-Z (screenshot).

In Linux I've tried:

lshw
Shows DIMM size in each bank.
Shows "clock" of 800MHz. Unclear whether that's from SPD (these are DDR2-800 DIMMs), or actual current speed.
Shows no info about CL, tRCD, tRP, tRAS or other timings that CPU-Z can display.

dmidecode
Shows pretty much same info as lshw.

Anyone know how to find detailed RAM timings in Linux? Would appreciate any pointers to software, or where to look inside /sys or /proc.

Thanks,
Frank
 
Old 10-05-2009, 06:57 PM   #2
highfructose327
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Did you run lshw as root? As root it gives more info,use this
Quote:
sudo lshw -html > ~/lshw.html
it will pipe it to a nice sorted html file in your home directory. You could also try when you boot and grub starts hit esc and select from the menu memtest+86. I read somewhere the CPU-Z runs in Wine so that might be another option.
 
Old 10-05-2009, 07:02 PM   #3
GlennsPref
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Hi, the system reads the info from bios output.

If you have spd set, it will be that, but otherwise it should be the real-time settings.

I have been able to see the settings with memtest.

HTH, Glenn
 
Old 10-05-2009, 08:16 PM   #4
fmyhr
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Thanks for the help, guys.

I should have mentioned that I was running lshw as root; it simply doesn't give as much info as CPU-Z does about RAM timings. Good to know that it's reporting the actual bus frequency, though. That's the most important thing for my present purposes.

Memtest86+ is what I usually use, as well. But with this hardware (AMD 770 North Bridge), Memtest v4.00 seems to report erroneous bus speed: it shows the DDR2-800 RAM running at DDR924, which I'm pretty sure is impossible for this non-exotic RAM. I reported this to the author of Memtest86+, who asked me to send him a CPU-Z dump... thus my question here.

Have seen mixed reports about running CPU-Z in Wine. I prefer not to do that right now.

Pity that lshw cannot show all the details that CPU-Z can. If I were a better programmer with more time, I'd try to add that.

Thanks again,
Frank
 
Old 10-05-2009, 08:21 PM   #5
thorkelljarl
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Overclock...

I have a motherboard that allows the RAM to be tweaked as part of overclocking, something that also shows the RAM settings. Even if your board is not for OC, your BIOS might tell you what your RAM is set at, or give you a possibility to change the speed and timing.

Otherwise, as stated by GlennsPref, memtest will measure the speed and timing of your RAM as it now runs.
 
Old 10-05-2009, 09:22 PM   #6
jefro
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http://www.overclock.net/linux-unix/...ram-linux.html

For a CPU-Z like graphical app.

dmidecode -d /dev/mem
 
Old 10-15-2009, 10:29 PM   #7
highfructose327
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fmyhr,

I saw this article being touting cpu-g as similar to cpu-z http://webupd8.blogspot.com/2009/10/...ntu-cpu-g.html I know it may be well after the fact for you. Thought it might be of interest anyhow.
 
  


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