I'm having some problems with artifacts on my Radeon HD4850 512 mb. I've searched around for similar threads, but no one seems to have the exact artifacts that I am experiencing.
They appear as little squares that show up primarily in high end games, but also in some low end ones, and once in while (seldomly) in Windows (mostly in the stock Windows image previewer). They seem to flicker depending on your within each game; that is to say, if my in game character turns, they flicker, but otherwise tend to remain still. Although, as previously mentioned, they keep still in the same spot on screen.
I tried changing the cooling paste on the card, which brought down idle temps about 10 degress C to around 48-50, but it didn't change artifacting.
The strange thing is, as I ran out of ideas, I decided to try the the stock ATI overclock tool and let it self calibrate. It overclocked the GPU to 630, and clocked the memory to 993. After this, the artifacting disappeared within Windows and is now confined (almost, see above) to games. More over, the artifacting is less intensive in games after this as well.
I've installed latest drivers of course, and before someone brings it up, the warranty has expired.
My system specs are:
OS: Windows 7 64 bit
CPU: Pentium Q8200
RAM: 4 Gigs