Some nVidia gpu's are "duals" such as this eVGA gtx460

Do these type of cards run a single task faster or is it capable of running two tasks?

I have 2 gtx570 and each runs a task even in SLI mode. I am considering buying a "duallie" but only if it runs two tasks. I searched at gpugrid.net but didnt see any info about duallies'.

thanks for looking!

Yes, a single physical card with dual GPUs (like that one) will be seen by BOINC as two separate cards. You will be able to run one task (from the same or different projects) on each of the two 'halves'.

It won't be able to run a single task at double the speed by using both halves.

I just went through some of this. I had twin GTX 580's. SLI was enabled. I did not really understand what was happening. I set cc.config to <run_all_gpus> and ran two tasks at the same time.

I no longer have the GTX 580's, problems with the liquid cooler. I now have air cooled GTX670's, SLI enabled, but <ignore_cuda_dev>1 (I run BOINC 6.12.34). What I saw was that BOINCstats showed me that I was doing as much work and getting as much credit ignoring device 1, as I had running both devices.

SLI makes one gonzo GPU and runs each task much faster, completing in way less time and on to the next task.

Anyway, that is my experience.

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Thanks Mitrichr

I have a pair of Asus gtx570's that take up 3 slots each. They run very cool 24/7 but I found on prime grid that the fans must be set manually at 100% to keep the temps down. I had them in SLI mode for a while but ran two tasks. I didn't think to try running just one like you did.

However, I took them out of SLI mode when I ran into a performance issue with DVDFab's blu ray copy program as shown here Using a gtx570 in sli mode to compress a movie from 50gb down to 25gb was not as good as just using my Q9550 CPU by itself with no assistance from the GPU. A single gtx570 was always better then my Q9550 CPU by itself. I was also getting motion sickness with elder scrolls and plants-vs-zombies did not need sli.

I borrowed a gtx670 for testing two weeks ago. It did not work with DVDFab nor with setiathome. DVDFab just released 8.202 version that works with kepler but I no longer have the 670 as it went to one of my kids.

will start new thread for my praw...