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Old 2006-08-26, 15:54   #1
Axel Fox
 
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Default Windows x64 better for Prime95 ?

Hi,

I'm currently running 2 instances of Prime95 on my new dualcore Pentium D 945. This CPU supports EM64T, but it is currently running a normal (32-bit) Windows XP Home. Would Prime95 benefit from me installing a 64-bit Windows XP ? And if so, how much more speed can I expect ?

Greets,
AxelFox.
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Old 2006-08-26, 16:28   #2
Mystwalker
 
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Trial Factoring (TF) nearly doubles speed, LL and P-1 won't increase performance, as the code is still 32 bit (and much harder to port to 64 bit than the TF code).
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Old 2006-08-26, 17:30   #3
Axel Fox
 
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Ah, I see.

So would it be better to set Prime95 to only Trial Factoring, or would it be better to keep letting PrimeNet decide what to assign ?

Greets,
AxelFox.
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Old 2006-08-26, 18:47   #4
Prime95
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TF doubles speed on an AMD64. I'm not sure what the difference is on a P4 architecture.

Don't bother upgrading. We need LL testers more than anything else and that will be the same speed whether you are running 32-bit or 64-bit prime95.
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Old 2006-09-14, 09:09   #5
Dresdenboy
 
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TF speedup in 64 bit mode using version 24.11:
On P4 (actually a Xeon with Nocona core):
http://mersenneforum.org/showpost.ph...4&postcount=95

On K8:
http://mersenneforum.org/showpost.ph...5&postcount=21

During my quick search I didn't find any comparison of 32 bit vs. 64 bit TF on Core 2 Duo. It might also be a significant change as it is on K8, while the SSE2 code in 32 bit mode is also doing fine thanks to the higher throughput SSEn units.
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Old 2006-09-14, 13:18   #6
Cruelty
 
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Quote:
Originally Posted by Dresdenboy View Post
During my quick search I didn't find any comparison of 32 bit vs. 64 bit TF on Core 2 Duo.
http://www.mersenneforum.org/showpos...&postcount=236
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