Well, I got my GTO a few days ago from eBay @ $240 shipped.
I was a little nervous when I got it because I was afraid it might not unlock or overclock well.
First things first I used Rivatuner to unlock the additional 4 Piplines and the additional shader......
.....
SUCCESS! now showing 16 and 6 I was presently supprised to see everything unlock ok
so, I started to see how high I could overclock it.
350, 900 stock
375, 900 ok
375, 1000 ok
400, 1000 ok
400, 1050 ok
400, 1100 ok
425, 1100 ok
450, 1100 Froze up in 3d mark 05
I forgot to benchmark it at 425, 1100, but at 400, 1100 I got a ~5450 in 3DMark05
Actually, I benchmarked with every change I made so I'll post the exact results when I get home.
I never tried pushing the memory to higher speeds but I suppose I might try it someday if I get the guts to, but for now there's no need. I'm able to run everything on full settings for now.
I'm currently running at 400, 1100. It idles around 68c and after a few hours of Doom3 on Ultra settings it gets up to about 89c, so the temps are acceptable
So for $250 Im running at 6800 Ultra performance This card friggin rocks!