I have an Intel 865PERLL motherboard and it has 4 memory slots. I have 2 sticks of Corsair XMS 256 MB PC3200 each in two of the slots. When I add more memory, I know I have to add in pairs (2 more sticks) but do I need to add the exact same Corsair memory, or will any brand of good quality PC3200 DDR memory do? I would appreciate your suggestions. Thank you.