CUDA low speed

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exoomer
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CUDA low speed

Post by exoomer » Sat Jul 30, 2011 1:41 pm

Hi, I've seen a table that shows a 4870x2 doing about 2400 M/s. I have a 5570 and Core2Duo e6600 @ 2,4 GHz, and I'm doing about 450M/s on my GPU, and about 50M/s on my CPU (25/s each core) - i'm running it on a Win 7 32bit. It's very good for me, but my friend has a Core i7 870 - 4 cores and a gtx 460. So I was expecting alot with that PC, but he only got about 850M/s for the GPU and 30M/s for each core = 120M/s for the CPU. He has a Win 7 64bit, so he's using BarsWF CUDA 64bit. Is this speed normal? I know, it's extremly fast, and other programs are way back behing BarsWF, but how can a 4870 make 2400M and a gtx 460 only 850? And how can my CPU make 25M/s (per core) and an i7 only 30M/s (per core)?

Thx
CPU: C2D E6600 at 2,4GHz | MB: ASUS P5B Deluxe | GPU: 8800GTS 640MB | RAM: 3x1024MB DDR2 Kingston 667MHz | Power: Fortron 700W | HDD: WD 400GB + WD 500GB | LCD: 22" LCD Samsung 223BW (16:10) + 19" Samsung 931c (4:3) | OS: Win7

Sc00bz
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Re: CUDA low speed

Post by Sc00bz » Sun Jul 31, 2011 2:08 am

With the Core i7 you might want to try 8 CPU threads since it has hyper threading. 25 * 2.93 / 2.4 = 30.5.

Nvidia cards have a lower clock-core vs ATI but Nvidia cards are more efficient per clock-core.
5570 is 650 MHz * 400 cores = 260,000 Mclock-cores
460 is 1300 MHz * 336 cores = 436,800 Mclock-cores
450 * 436,800 / 260,000 = 756
850 / 756 = 1.1243
So in this case, Nvidia is 12.43% more efficient per clock-core than ATI.

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