I will be building a new system soon using the Asus Rampage Formula motherboard. From my understanding it has Native DDR2 1066 Support, so i'm looking at purchasing some Corsair TWIN2X2048-8500C5DF ram. It's rated at 1066MHz so im presuming so far that these 2 components will run well together (someone correct me if i'm wrong i'm no expert). There is also TWIN2X4096-8500C5DF pair of ram modules here is my dilemma. I want to run Xp pro and i know it wont register the full 4gb's but will it hinder the rams performance in anyway? I want to get the 4gb pair so i can future proof myself for when i install Vista one day. So will running the 4gb pair in xp hinder the performance of the ram?