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tonyhouse
n00b
Joined: 18 Jan 2005
Posts: 6
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 Posted: Mon Mar 07, 2005 6:19 pm Post subject: change voltage of the processor |
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in windows there is an utility called rmclock, with it I made the feature cool'n quiet working with these specs:
multiplier frequency vcore
4x 800 0,8
9x 1800 1,2
this is a STABLE system with full functionality and less heat production...of course...
this was the original configuration:
multiplier frequency vcore
4x 800 1,1
9x 1800 1,5
if I would apply the same settings for my gentoo64 wich setting I have to change?
thanks |
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Fran
Guru
Joined: 29 Feb 2004
Posts: 530
Location: Coruña (Spain)
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| Posted: Mon Mar 07, 2005 7:18 pm Post subject: Re: change voltage of the processor |
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| tonyhouse wrote: | | if I would apply the same settings for my gentoo64 wich setting I have to change? |
You must patch the kernel. Specifically, arch/i386/kernel/cpu/cpufreq/powernow-k8.c. I've made a patch to have my athlon at 1.4V when it's at full speed (instead of 1.5V). In my case, the patch (for 2.6.11) is:
| Code: | *** powernow-k8.c 2005-03-05 16:21:02.000000000 +0100
--- powernow-k8.c 2005-03-05 16:44:54.000000000 +0100
***************
*** 522,527 ****
--- 522,529 ----
static void print_basics(struct powernow_k8_data *data)
{
int j;
+ if (data->numps >= 0)
+ data->powernow_table[0].index += (4 << 8);
for (j = 0; j < data->numps; j++) {
if (data->powernow_table[j].frequency != CPUFREQ_ENTRY_INVALID)
printk(KERN_INFO PFX " %d : fid 0x%x (%d MHz), vid 0x%x (%d mV)\n", j, |
Adding (4 << 8) has the effect of decreasing the voltage 0.1V (each (1 << 8) means -25mV). So if you want to get 0.3V less, you must add (12 << 8) to the corresponding value in data->powernow_table[j].index. The value of j depends on the bios and m/b. In my case, 0 is for 2.2GHz, 1 for 1.8GHz and 2 for 1GHz. So I only change powernow_table[0].
Do this under your own responsability, of course. This worked for me, but I can't promise you your computer won't explode :P. |
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tonyhouse
n00b
Joined: 18 Jan 2005
Posts: 6
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| Posted: Tue Mar 08, 2005 11:31 am Post subject: |
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thanks a lot!!!
I made it and the voltage are so low as I can....
there is my dmesg on start...
| Code: | ##########################
Chanching voltage values
powernow-k8: 0 : fid 0xa (1800 MHz), vid 0xe (1200 mV)
powernow-k8: 1 : fid 0x8 (1600 MHz), vid 0x12 (1100 mV)
powernow-k8: 2 : fid 0x0 (800 MHz), vid 0x1e (800 mV)
Stanza's patch
##########################
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Fran
Guru
Joined: 29 Feb 2004
Posts: 530
Location: Coruña (Spain)
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| Posted: Tue Mar 08, 2005 4:45 pm Post subject: |
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| tonyhouse wrote: | thanks a lot!!!
I made it and the voltage are so low as I can....
there is my dmesg on start...
| Code: | ##########################
Chanching voltage values
powernow-k8: 0 : fid 0xa (1800 MHz), vid 0xe (1200 mV)
powernow-k8: 1 : fid 0x8 (1600 MHz), vid 0x12 (1100 mV)
powernow-k8: 2 : fid 0x0 (800 MHz), vid 0x1e (800 mV)
Stanza's patch
##########################
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Mmm, 1.2V... I'm tempted to lower my voltage a few decivolts  . I set it to 1.4 because that was the maximum voltage which allowed me to set the zalman at min speed (1400 rpms) without the temp raising to >64º. Seeing yours I thing I'll try with 1.3V@2.2GHz. |
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Gentoo on AMD64
