You have a software/ driver issue most likely..what card was in there before? there is an order for doing it as you may know now, It will kill performance just like what you described if done wrong.
Tekxoid wrote a procedure, but I can't find the link at the moment.
Don't forget to use Driver Cleaner to get rid of the nasties, and delete any old ATI or NVIDIA folders from your C driver before reinstalling the new ones.
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