Originally Posted by citrix

I'm not sure then. but I have PD 930 with asus mobo made beginning of the year, and I installed vista it did install fine. at that time, CPU and mobo manufactuers didn't even worry about vista ready.

I guess quad core is very new, there may be still issues with quad core CPU and mobo compatibility. And if you are running vista ultimate, you need a good graphics card and 2GB+ RAM.