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Old 2017-02-10, 18:56   #1
marigonzes
 
Feb 2017

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Default FP64 or FP32

I have a question about the software. I was wondering if it makes more use of FP64 or FP32, i.e, double precision or single precision operations. I am thinking of acquiring a graphics card and I would like to take into account the needs of prime95.

Thank you.
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Old 2017-02-10, 20:22   #2
Mark Rose
 
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Prime95 doesn't use a graphics card, but performs best with Intel CPUs supporting AVX2 and the all the memory channels populated with the fastest dual-rank memory supported by the CPU.
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Old 2017-02-10, 20:28   #3
marigonzes
 
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Ok. And what about Trial Factoring on a GPU? Does it make a difference in that case?
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Old 2017-02-10, 21:02   #4
VBCurtis
 
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The version of the software that does use a GPU, CUDALucas, uses DP operations for the lucas-lehmer test.
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Old 2017-02-10, 23:13   #5
henryzz
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Quote:
Originally Posted by marigonzes View Post
Ok. And what about Trial Factoring on a GPU? Does it make a difference in that case?
Trial factoring uses SP
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Old 2017-02-11, 01:06   #6
TheJudger
 
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TF on GPU (mfakt[co]) is using 32bit (unsigned) integers most of the time.

Last fiddled with by TheJudger on 2017-02-11 at 01:06
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