I've been getting some very strange issues with my system that appear to only happen when my GPU is overclocked. Darkplaces, an advanced Quake engine, crashes. L4D2 was acting up on me... it stalls and plays the last sound byte (for about a second), but doesn't actually crash (it did once as soon as I joined a game, though). Sometimes, folding@home crashes on start (generic Windows error message... folding@home has stopped working and needs to close). It occurs to me that none of these issues are present when my GPU is overclocked. I've run 2.5 hours of the OCCT GPU test on it without a single error, so the card itself should be stable. This leads me to wonder if my psu is giving out under the added load an overclocked GPU imposes. The GTX260 is a pretty heavy GPU, the first I've ever owned that required two 6-pin connectors. It doesn't fail in the stability test, but messes with my games (which would impose load on the entire system rather than just the GPU like the OCCT test). I've tested the rest of my system with 10+ hours of OCCT Linpack, and I've ran memtest86+ for 4.5 hours (enough time for at least 3 passes), so I know the rest of my system should be good to go. Power supply is an Antec NeoHe 550w. I would guess this ought to be enough to handle an overclocked GTX260, however, it's one of those "multiple" +12v rail units (all 3 rated for 18A), which really isn't 3 rails, just a single rail split up into 3. And so, I'm thinking the PSU can't handle it. What are your thoughts?