I got some risers in today and added a 5770. total is 2 5870, 1 6950 and a 5770. I've been uninstalling and installing cat versions like 12.8, 12.4, stream v2.6 and v2.8. What is the definitive answer? What driver combo do I go for?

p.s. average sustained before the addition of the 5770 was ~1100Khs.
OS: Windows 7 x64

Reward to whom provides info that leads my system back to operation. (.33271053LTC)