I recently added a second GTX 580 to my system. The two cards seem to be working decently well in most games/benchmarks, but Battlefield 3 is virtually unplayable, as FPS swings from ~60 down to a slideshow every 5 or 10 seconds and then back up to 60. The effect seems to get worse the longer the game is played and seems most noticeable in large, bright, open areas. Temps are good, I have an 850W PSU and an i5 2500K, so I'd be surprised if any component other than the graphics card were causing the problem. It looks like the GPU memory usage for each card is at 1500+ pretty much constantly, which is, of course, 100%, so that could be the problem. I deleted my old drivers and installed the latest drivers from NVIDIA's website, to no avail. I'm not sure what to do next. Could 3Gb of memory really not be enough for BF3?
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6/27/12 at 7:53pm