I got an MSI GTX 570 OC. It lagged in FurMark and artifacted in Mafia II. I went to NCIX today and exchanged it for a new one. I still get these problems. I see that if I raise the voltage from 0.963v to 1.1v, the problem in Furmark gets better. What could be a problem apart from the GPU. MSI said it could be the PSU. I have a Cougar CMX 700 watt one, and also tried my friend's Corsair GS700. It lagged with both. An MSI 460 Hawk and an XFX 6950 Unlocked seemed to work fine on my system. Help me out guys!
And I would not worry about Mafia II. On my 5850 computer, it eventually artifacts so badly it crashes the video driver. On my 470 computer it sometimes artifacts (fairly rare) but never crashes. I think it is just a bad console port.
Yes, it is a port. Most games are on all three platforms, and since the consoles are the most specific hardware and biggest market, the games are designed for them and then roughly transferred over to PC.
Personally I wouldn't spend my money on this card unless it can be modded to ware the issue was no longer a concern. However that requires effort and skill. The mod will basically have to be to improve cooling as much as possible while being hopeful for the best. So far most if not all GTX 570 have the same pcb.