I currently have 2 x 1GB Corsair XMS2 pc-6400 installed on my pc and thinking about upgrading my memory to 4GB but I don't know if I should buy it as 2 x 2GB or 4 x 1GB sticks. Will the 4x1 give any better performance-wise and such? and what brand of memory would you all recommend? This will going on a Gigabyte P35-DS3L. All suggestions and comments are welcomed . Thanks alot