I've had my new card for a few days, and it's fine though I've had 2 or 3 BSOD's or machine crashes.
I tried to run the latest 3DMark 06 this morning, but after three tries it's not got past the 2nd test, re. the above problems. Every time.
Faulty card? This is the latest WHQL drivers, and a Seasonic 600 PSU.