Ok found it: http://www.twcenter.net/forums/showthread.php?t=305307

In this thread at the TWC, the OP links to a thread at the Nvidia forums and the official CA .com site.

It seems that the pre 100.x drivers solve this problem. This might make sense actually because I had this problem on a 7300GT with the latest drivers. Installing the older drivers and changing a few setting eliminated it.

[speculation]In short this issue may not be the card at all, but Nvidia drivers between certain versions.[/speculation]