i just bought an evga 790i and realize it only support ddr 3 only. then i check the price for ddr 3 ram and ****tt they cost alot than i imagine. my budget is limited after i upgrade the motherboard a cpu. can you really tell the different from like 1300 mhz memory and a 2000mhz memory? what the best brand and place i could spend 200 dollar on? i have an evga 790i with a q6700, 8600 ddr 3 video card. and with wondering if my cooling heatsink Masscool 8WA741 is good enough to keep them cool?