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Overclocked i5 2500K only shows 3.30GHz

post #1 of 10
Thread Starter 
i just got my ASUS P8Z68-V Pro/GEN3 system setup with an i5 2500K overclocked to 4.5GHz and even with the latest kernels and firmwares /proc/cpuinfo, cpufreq-info and others still only show 3.30GHz as the maximum available option.

Settings in UEFI:

Target CPU Turbo-Mode Speed: 4532MHz
Target DRAM Speed: 1648MHz
BCLK: 103
Turbo Ratio: 44
CPU Voltage: 1.35
DRAM Voltage: 1.5

I'm running Ubuntu 12.04 LTS, but after reading a thread here it looks like I'm running into a Linux limitation.

Anyone else running an overclocked i5/i7 on p67/z68 with success?

P.S. I have ran all kinds of stress testing software like "stress", prime95, etc.
post #2 of 10
maybe the cpuinfo only shows the stock clock..
can you use cpu-z on linux yet? i havernt kept up or do you still have to use Cuda-z??
try one of them and see smile.gif
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post #3 of 10
Thread Starter 
Quote:
Originally Posted by stubass View Post

maybe the cpuinfo only shows the stock clock..
can you use cpu-z on linux yet? i havernt kept up or do you still have to use Cuda-z??
try one of them and see smile.gif

good point, after some googling though came across these interesting discoveries:

"dmidecode" is the raw data direct from the kernel bout the cpu and other hardware, worked well.

there is a governor that limits the speed of the cpu at the kernel level. it is a daemon that has a max/min setting that can be changed in templates in /sys/devices/system/cpu/cpu0/cpufreq/scaling_available_governors

ugly right?

so yea, it sounds like i5/i7 may be beyond linux at this point and manual intervention is required, or none of the developers have such "advanced" hardware to play with yet, no idea. but i guess i have a lot of reading ahead of me now.
post #4 of 10
check out i7z

http://code.google.com/p/i7z/

gentoo has a package for it, i'd imagine ubuntu does as well. I believe this is aware of intel's "turbo" mode whereas the native cpufreq tools are not yet. it will probably show you the numbers that you are used to seeing under windows
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post #5 of 10
Windows 7 does the same thing. No big deal.

155
Edited by metal_gunjee - 3/26/12 at 8:20pm
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post #6 of 10
Thread Starter 
Quote:
Originally Posted by lloyd mcclendon View Post

check out i7z
http://code.google.com/p/i7z/
gentoo has a package for it, i'd imagine ubuntu does as well. I believe this is aware of intel's "turbo" mode whereas the native cpufreq tools are not yet. it will probably show you the numbers that you are used to seeing under windows

awesome.. that worked a treat!
Code:
Socket [0] - [physical cores=4, logical cores=4, max online cores ever=4]
  TURBO ENABLED on 4 Cores, Hyper Threading OFF
  True Frequency 3502.00 MHz (103.00 x [34])
  Max TURBO Multiplier (if Enabled) with 1/2/3/4 Cores is  59x/59x/59x/59x
  Current Frequency 4532.00 MHz [103.00 x 44.00] (Max of below)
        Core [core-id]  :Actual Freq (Mult.)      C0%   Halt(C1)%  C3 %   C6 %
        Core 1 [0]:       4532.00 (44.00x)       100       0       0       0
        Core 2 [1]:       4532.00 (44.00x)       100       0       0       0
        Core 3 [2]:       4532.00 (44.00x)       100       0       0       0
        Core 4 [3]:       4532.00 (44.00x)       100       0       0       0

post #7 of 10
Thread Starter 
Quote:
Originally Posted by metal_gunjee View Post

Windows 7 does the same thing. No big deal.
155

its actually important when you want to use cpufreq to manage the cpu frequencies in linux.
post #8 of 10
Thread Starter 
back again, just wanted to show off this byobu setup with a small python script i made that shows the cpufreq

319

mprime95 is running and i7z is outputting to a log file. you can see the 4532.00 at the bottom which is the realtime freq, with temp and cpufan next to it.
post #9 of 10
This has been a problem with the kernel ever since the first Core i7's came out. It's just a display issue; the CPU is actually running at the correct frequency, as you discovered already. The response I got from the driver maintainer was "Don't overclock." Not very satisfying.
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post #10 of 10
Thread Starter 
back with another fun update. so i like visuals and monitoring, been wanting to try out graphite for monitoring and thought this would be a nice project to get hands on with it.

264

what you're seeing from top left is load average, memory usage, cpu percentage used, then the bottom right graph is the cpu frequency. i set the max to be 4532 as that's the max mine is set to run at.
Edited by diecast - 3/29/12 at 2:36pm
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