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GPU-Z is well known for showing screwy results with newer drivers, not surprised by Rivatuner not being compatible with it yet either.
The thing that gets me is that on a completely fresh install, the 8.9's atikmdag on me in COD4 at least once every two minutes, even though I'm not overclocking. Will they EVER fix this?
Vantage and Furmark are fine, for what that's worth. Crysis, Bioshock, GRID and COD4 all run for a short while then the rendering just stops.
This sounds like what I experienced while testing different aftermarket coolers on my 4870 and caused the VRMs to overheat due to insufficient cooling. You could download a trial of Everest and have it log the temperature of the VRMs while you run some benches/games. Anything above 90c generally makes my card do exactly what you are describing. However the stock cooler never got above 75c on the VRMs so this might not be the issue at all. Good luck!