With how new Warhammer is and it still being in beta and you pointing out that it runs fine in all of those other games I would have to point at Warhammer if that is the only game it happens in.
What driver version are you running with this card? Try downloading the latest beta drivers from
http://www.nvidia.com/Download/Find.aspx, downloading driver sweeper from
http://downloads.guru3d.com/download.php?det=1655, uninstalling the display driver and then restarting in to safe mode and running the driver sweeper. Reinstall the 177.92 betas and see if the same thing is happening. If it does than try the card in your system as well to see if you can replicate the problem. If it is still only happening in Warhammer than it is probably the application. The developer would have to help at that point. I don't know anything about Warhammer other than what I have read. I am too hooked on Spore right now to play Warhammer.
If you can replicate it in multiple games in multiple systems than it is the card.
If it is the card causing it than make a support ticket at
http://www.xfxforce.com/en-us/Help/Support.aspx and PM me the ticket number.
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