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Old 2009-11-06, 19:48   #3
willmore's Avatar
Aug 2002

22·3·5 Posts

Hey, joe, thanks for the input. I did check that. :) When I see dissimilar performance like that, it's the first thing that comes to mind--"Hey, something is using up part of that die, let's check it out."

But, sadly, that's not the case.

Here's what I've found. I have downloaded fresh from the source the 32 and 64 bit versions of 25.9 and 25.11. p95 config is two workers each with two threads--basically, one die per worker, so they're sharing the same 4M L2.

25.9/32 30.5 & 37.0
25.11/32 30.5 & 37.2
25.9/64 30.8 & 30.9
25.11/64 30.8 & 31.0

Now, these numbers aren't likely to be horribly accuract, but they show the difference I see. The 32 bit clients run one core a bit slower while the 64 bit cores seem fine.

Here's something even *more* interesting. To do my testing, I coppied my prime95 folder out of Program Files and onto the desktop. Running things there *immediately* sped things up. If I go back to the 25.9/32 that I have in the Program Files directory, I get 44.5 & 43.0. WTF? Wierd.

So, there seems to be some strange magic going on with the version in the Program Files directory. Maybe that'll provide someone with a clue as to what's going on. For now, I'm moving Prime95 out of Program Files and I'm using the 64 bit client. Very odd. But, at least it's partially solved.
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