You overclocked in the wrong tab. If you put the card up from 300/600 that means you changed the 2D settings of the card.The 3D settings are at 400/800. There is a 2D/3D selection tab where the clock settings are.
Other than that, I managed to take my Point of View card to 500/950, I get artifacts in certain games if I use anything higher. Also, try running the Dawn Ultra demo with 8XAA/8XAF, that usually shows if your ram can take the clock speed you set it on.
Fafnir: Intel Core 2 Quad email@example.comGhz|eVGA 780i SLI|PNY GTX480 |Kingston DDR667 4096MB|WD Black Caviar 500GB|Seagate SATA 250GB|Seagate SATA 200GB| Seagate SATA 160GB|OptiArc AD-7173S DVDRW|Nec 3351 DVDRW|Creative X-FI XM|LG Flatron W2261V|Logitech X-530|Thermaltake Armor|Amptac 850W SLI PSU|Logitech G9 Mouse|Xigmatek HDT S-1283 CPU Cooler|Windows 7/FW 257.21
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