My first post - but I thought I should finally post to the forum to give some more information on this card as reviews or comments are so hard to find.
I bought this 7800GT last Friday and received it on Monday (very fast service from the seller). Anyway, I ran the detect optimal frequencies overclock test in Coolbits and it came back with a 474 x 1150. I have not yet tested it at this setting, but have run it at 450 x 1100 (I'm easing into it...). So far so good.
At this setting (450x1100) my 3dmark05 score was 7,549. I have not had any artifacting or other problems. The hottest I noticed it getting at this oc was 57C, which was after an 1hr of playing half-life2 at 4x AA, 8x Anistropic and 1680X1050 resolution (with all settings at max). With no load it is at around 40-42C.
As I say, so far so good. I wanted to post this as I was originally wondering if I should buy with virtually no reviews anywhere, but so far I am glad I did. I have seen higher oc's out there on other cards, but I also don't feel I have not really pushed it yet.
My system specs are AMD3200 (Winnie) oc at 2.5 w. XP90; 7800gt 3dfuzion oc at 450x1100; dell 2005fpw; Audigy2 ZS; 1G Corsair; Asus SLI-Deluxe MB.
That's enough from me, now it's back to HL2. I may post back if I start running at a higher oc.