Doin some testing on mine today and noticed Crysis studdering from time to time. I did a furmark test and sure enough, my GPU1 throttles back after a few minutes.
Looks like its time to watercool.
__________________ Ivy Bridge 3770K @ 5.0 Ghz (delidded) Asus P8Z77 WS 16GB Gskil DDR3-2400 EVGA GTX 670 FTW (x2) SLi Surround | Dell 2709W (x3) OCZ Vertex 3/Corsair Force GT Raid 0 480Gb - Windows 7 x64 SP1 OCZ Vertex 120Gb SSD Cache for Seagate 2Tb - File backup Corsair Obsidian 800D | Enermax Revolution85+ 1050W HeatKiller 3.0 | EK GTX680 WB (x2) | TFC Exchanger Quad Rad | (x4) Scythe Gentle Typhoon |Swiftech MCP655 | EK drive bay Res.  |