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32bit vs 64bit crunching

Bradtech519

Bradtech519

Senior member
Is there a difference in performance when crunching from an XP SP3 box and a Windows 7 or Linux 64bit machine?
 
On PrimeGrid, definitely. But only on the sieves, so far. I'm not sure about other projects; Collatz might be faster on 64-bit, but I'm not sure.
 
Yea I'd like to know about on F@H on 64bit, I might install Win7 64 soon.

DPAD is slower with 64bit as it hasn't been updated for it!
 
From my own experience, there's basically no difference for 32 and 64 bit for F@H. The one machine that I moved from XP to 7 produced the same PPD in both OSes.
 
There's no difference with F@H since it's still an x86-based client.

With BOINC it makes a significant difference, at least as far as the benchmark is concerned. Just going between Windows 32 and 64-bit I saw a 33% increase in Dhrystone performance (RAM-limited, I think), not sure how much each project is dependent on integer calculations, though. Linux managed to muscle even more out of my file server on an old s939 4000+.
 
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