Hello Everybody !
Happy new year !

There is something that annoys me a little: if you take a look @ my computers, id 54975 & ID 114761, you can see they use the same CPU, Q6600 @ 2.4G.
Matador is overclocked @ 3.2.
If you look at the details, there is a huge difference in MIPS & Gflops.
Matador is @ 4Gflops and 16000 Mips, while the other is only @ 2.3Gflops and only at 4000 Mips.
even if matador is 25% faster on clock, I don't think it can make a so huge difference.

Do you think the OS can explain this ?

The benchmark system is a Boinc feature, rather than a project issue. Linux and Windows tend to be somewhat unequal. IIRC Linux under-reports but generally does more work (on the CPU). GPUGrid is a GPU project so reported performance of the CPU is largely irrelevant to actual GPU task performance and credit. As some CPU is needed, the faster the CPU the better, but a generic benchmark does not accurately measure real performance on a real project.

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The benchmark of the 32 bit and the 64 bit BOINC manager are different. I have changed my WinXP from 32 bit to 64 bit recently, and the benchmark results of the 32 bit and the 64 bit BOINC manager are different even on the same hardware.
I don't exactly remember the numbers, but on the 64 bit client the floating point ops are lower by ~10%, and the integer MIPS are higher by ~40% on the same hardware.
I still have a 32 bit client, almost the same hardware as one of my 64 bit clients: (Core i7-870)
on the 64 bit client:
3623.97 MFLOPS
12621.2 MIPS
On the 32 bit client:
4200.95 MFLOPS
9044.98 MIPS

Hello.
Yes i know it is a boinc feature, and GPUgrid does not really mind about cpu power, but i found this surprising.
The windows machine is 32 bits, while the gentoo machine is 64bits.
Having so much difference between two same processors caught my attention....
Thank you for your answers...