Grabbed myself a Sapphire X800 Pro VIVO this morning and replaced my 9800XT. Backed up the cards bios and went straight for the softmod. Unlocked the remaining four pipelines with the Gigabyte X800 XT bios and got 520 core and 560 (1120) mem with no issues at all. I believe heat can be a problem when modding these cards so I took the precaution of winding back core and mem to 500 and 550 respectively, I think an arctic cooler may be in order here. Anyway, Doom 3 timedemo runs at 56 fps @ 1280 x 1024, and 48 fps @ 1600 x 1200. I urge anyone with an X800 Pro VIVO and 1.6ns memory to give this a whirl. Must be a VIVO though, doesn't work with plain vanilla X800 Pro.