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Old 2012-01-13, 18:50   #1
laich2
 
Jan 2012

110 Posts
Talking How to manually correct CPU GHz in prime net

I am under-clocking my CPU for cooler and quieter operation. I do it by changing FID and VID after Linux booted up. However, since the speed in BIOS is not changed (so does /proc/cpuinfo), so does CPU speed appears in mersenne.net. That mean mersenne sees my cpus as 2.9GHz but in fact it is running at 2.7GHz only. (may be I am cheating extra GHz-hrs. . .)
Is there a way to correct this number in either prime95 v2.6, or in the mersene.net cpu record?

best regards
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Old 2012-01-13, 20:46   #2
ckdo
 
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Exit Prime95. Add a line like CpuSpeed=2700 to the top section of local.txt. Start Prime95 and let it communicate with PrimeNet. Read undoc.txt at times.
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Old 2012-01-15, 22:49   #3
dabaichi
 
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Does GHz-Days on PrimeNet depend on CPU speed?
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Old 2012-01-15, 22:57   #4
bcp19
 
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Quote:
Originally Posted by dabaichi View Post
Does GHz-Days on PrimeNet depend on CPU speed?
No
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Old 2012-01-15, 22:58   #5
Mini-Geek
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"Tim Sorbera"
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Quote:
Originally Posted by dabaichi View Post
Does GHz-Days on PrimeNet depend on CPU speed?
No, the CPU speed reported on PrimeNet doesn't affect how much credit you get for the work it completes.
GHz-days depends on how long it would have taken on a reference machine (IIRC, a 1 GHz Core 2), not on the speed PrimeNet believes your CPU to be clocked at. Of course, your CPU's actual speed affects how quickly it completes work, and so the rate at which it earns GHz-days.
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Old 2012-01-15, 22:59   #6
diamonddave
 
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Quote:
Originally Posted by dabaichi View Post
Does GHz-Days on PrimeNet depend on CPU speed?
No, the work produced determine the Ghz-Days. You could use a Pentium 90 to get the result, in the end you would get the same Ghz-Days.
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Old 2012-01-16, 04:51   #7
dabaichi
 
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Quote:
Originally Posted by Mini-Geek View Post
No, the CPU speed reported on PrimeNet doesn't affect how much credit you get for the work it completes.
GHz-days depends on how long it would have taken on a reference machine (IIRC, a 1 GHz Core 2), not on the speed PrimeNet believes your CPU to be clocked at. Of course, your CPU's actual speed affects how quickly it completes work, and so the rate at which it earns GHz-days.
I see. Thank you all!
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