I just got my GTS 512 in today and I'm currently running 800 on the core, 1100 on the memory and 1998 on the shaders, and that's 100% stable no artifacts. Honestly, I'm not seeing any reason for the GTX if the GTS 512 has the same GPU headroom for $100 less. The memory will have more headroom, but that's about it (which is admittedly handy with the 256-bit interface). Sadly, my 3GHz Opteron 165 with 2x1GB DDR500 is my main bottleneck. :( I'm more concerned about 45nm Intel than I am the '9800'GTX.