question on quad core processor speeds

Happy New Year, everyone. I have a question about the processor in my wife’s new computer. It’s an AMD Phenom II X 4 920.

The processor speed is supposed to be 2.8 Ghz (2800 Mhz). But when I look in YaST > Hardware > Hardware Information I see the following.

core id 0, 800 Mhz
core id 1, 2800 Mhz
core id 2, 2800 Mhz
core id 3, 800 Mhz

And when I look at My Computer > CPU Information it shows the CPU speed as 800 Mhz.

Is this indicating something wrong with two of the cores? Are they seriously under performing the other two cores?

Thanks! :slight_smile:

socref

Hi
Run cpufreq-info and you can change it if you want, I’m guessing it’s
set to ondemand which is normal. Run something like prime95 or boinc
and you will see them all come up to speed.


Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel 2.6.27.39-0.3-default
up 14:18, 4 users, load average: 0.14, 0.24, 0.18
GPU GeForce 8600 GTS Silent - CUDA Driver Version: 190.18

Thanks! I ran cpufreq-info and it does mention “ondemand” though I don’t see any means to change that setting. Appreciate the reply.
socref

Hi
have a look at the man page for various options, there are two other
commands, cpufreq-selector and cpufreq-set. Check the man pages for
those :wink:


Cheers Malcolm °¿° (Linux Counter #276890)
SUSE Linux Enterprise Desktop 11 (x86_64) Kernel 2.6.27.39-0.3-default
up 1 day 16:49, 5 users, load average: 0.16, 0.11, 0.09
GPU GeForce 8600 GTS Silent - CUDA Driver Version: 190.18

This is probably not a defective chip. The AMD Phenom II X4 has a dynamic power savings feature. The clock speed dynamically adjusts according to computing demand. Given that power consumption increases at the square of frequency, slightly lowering CPU speeds can achieve an enormous savings in power.

To test if the chip is working correctly, try opening a number of computationally demanding programs (as was suggested by malcom). If the clock speeds don’t increase correspondingly, you might have a defect. You could also attempt over-clocking using you motherboard’s BIOS. Be careful, over-clocking can destroy your CPU and MB.

Thanks for this reply. I am nowhere near knowledgeable enough to attempt over-clocking, so no worries about breaking anything! rotfl!

Are there any programs within SuSE that I can use to test the processor? I could hunt for bionc or prime95 and then try to figure out how to use them. But if there is something within SuSE that will similarly put the processor through its paces, that would be simpler for sure.

Thx!
socref

It’s not a defect, it’s a feature. Dual cores have it too. Sometimes I have one core running at another freq than the other. Yast’s hwinfo shows it like that. Another time they run at the same freq, hwinfo shows that.

Thanks for this info. :o)
socref