iMac 27" AMD Radeon HD 6970M 2048 MB - Video Problems

I just got a brand new iMac 27" and am having issues with my video. The last iMac I bought had video issues, and a couple months after owning it, Apple/AMD fixed the driver issue and it worked fine. However, this video issue happens within 5 minutes of each time I start the machine. Here is a screen shot - check out the upper menu distortion and the lower menu.

Anyway, is this something I should try and live with until Apple sends out an update - or do I need to return this Mac?

Thanks - John-Paul