I have two 8800GTX cards on a Windows machine (Intel Q6600 CPU, 2x1GB DDR2 RAM, Asus Striker Extreme NForce680i SLI motherboard).
I have speed problem in “multiGPU” example of CUDA SDK. When i run in 2-GPU mode the processing time is 10x slower than the 1-GPU mode:
2 GPUs found Processing time: 472.811005 (ms) Only one GPU found Processing time: 40.686001 (ms)
I attached two 600W psu to each of the cards. I think there is no power problem.
Has anyoen ever tried to run this application in 2-GPU mode? What would I see after the execution of this “multiGPU” application. Any help/suggestion will be useful.