I have acquired a 5850 from Sapphire but had several problems with drivers and OpenGL applications, including games such as Second Life. The card randomly freezes and the screen gets black or gray with green artifacts. The card was exchanged by an Asus model paying extra U$20,00, still having the same issues. My previous card was a 4770 and then a 9600GT. Sorry guys, but why is this rant for nvidia? They have contributed much more to the PC Gaming industry than anyone else. I know they also have problems but seriously... I didn't have any problems with my old 9600GT, I know there will be people to argue about it or defend ATI but I will not buy another Radeon card after this 5850, it runs all newer games with no problems. Now... Try to play that older MMORPG or better yet, try running Windows XP and watch the display driver encountering several errors.
Hoping Nvidia will do well this time, everybody wins, even who hates Nvidia! Remember the FX Series? That was a mess, but if they didn't release the 6600GT/6800GT series we would have been screwed in ATI's hands with the all glorious refreshing x series Radeons.
By the way, check the older stuff from Charlie (Semi Acurrate) such as you may find at The Inquirer. He even said ATI Radeon 2900XT was over two times faster than a 8800GTX with false claims and secret sources. He is not trustworthy.
Never in the computer story there were so many rumors about a company and product itself, don't even think it was the same when Microsoft launched Windows Vista.
Let's hope to have fair prices and competition!