Yup...same here... Vista X64, 181.20 drivers, 450MHz Core, 798MHz Memory and 1783 for the shaders. My GX2 is running WU 5770 (353 pts) : 5260 ppd on Core 1 and WU 5753 (511 pts) : 3650 ppd on Core 2Update on the min. core and mem speeds, max. shaders (or for the time being 1728MHz). Are you ready?
WU 5772 (353 pts): 5170 ppd... perfectly stable. Core is at 77C.
I'd say it works.
Core 1 hovers at 78C and core 2 is at 83C! Stable as a rock!