ok i have 4 gigs of Corsair xms2 6400 800mhz 5.5.5.12 but was thinking of upgrading to http://www.newegg.com/Product/Product.aspx?Item=N82E16820146677 1066 for my new mobo would i see a decrease in performance with only two gigs of way better memory? i would add two more gigs later on.when cash allows