I recently RMA'd my previous hd 6770 that had a similar problem and received a replacement card. This time, instead of uninstalling drivers, I just reformatted. When I had everything set up and ready to go, I observed the same issues I experienced with my other radeon hd 6770 (the one I sent back).
In GTA IV, I get this horrendous lag; choppy--almost like the game is being perpetually sped up then slowed down in a reoccurring cycle. I haven't tried playing skyrim yet, but before I RMA'd the last one, the same thing happened in Skyrim too. I singled out the video card as the source of the error because my old 8800gtx (on the same rig I have now) doesn't produce this kind of problem. I will try to upload a video onto YouTube soon.
XFX Radeon HD 6770 1gb
Intel i5 3570k (OC'd to 4000mhz)
1tb hd 7200rpm
Biostar Hi-fi z77x
OS: Windows 7 64-bit ultimate
This is making me really angry because I bought this card to play some games. Now that I'm on break, I just want to relax but I have to deal with this crap. I want to add that I've installed 'Virtu MVP' and when I plug my VGA cord into the mobo slot (integrated graphics), the game runs smoother than when I plug the VGA cord into the 6770 <-- this is inexplicable. As an attempt to remedy this situation, I tried to OC the card. I got it to 950mhz on stock voltages and has been stable; although no significant difference has been observed in game.
For games that aren't as hardware intensive (IE: NBA 2k13) this is not an issue.
In any case, I see people with the XFX radeon HD 6770 playing gta 4 at maxed settings with less lag than I do now.
GTA IV Settings
everything is set to high except night shadows (low)
ansiotropic filtering is set to 4x
definition is checked
vsync is off
If you find my older post, you'll read about the problems I had with my pre-rma'd 6770. I want to see if the community here can pinpoint any component(s) of my computer that could potentially be causing this problem. I realize there exists a chance that this card has the same problem as my old one, but I want to consider other possibilities.
I want to add one more bit of information: I installed the drivers posted directly on the XFX website for the Radeon HD 6770. But in dxdiag, the device name under the display tab is "AMD Radeon HD 6700 series" which seems awfully generic. Could this issue be a product of crappy drivers? With all the nvidia cards I've owned, they usually have the actual card name listed.
Please offer your insight, any help is appreciated!