Is anyone else still getting really bad flickering with a single card with dual GPU?

Intel Core 2 Quad Q9650
CORSAIR DOMINATOR DDR3-1333 8GB
ASUS P5E3 PREMIUM/WIFI-AP @n LGA 775 Intel X48 Motherboard
ATI - 4870 X2 Video
Creative X-Fi Fatality
27" HD Monitor
Thermaltake 1200W