@ Shadowfax 2009
http://www.tomshardware.com/reviews/...rade,2264.html
Here you'll find out that 3GB or 6GB, the performance difference is less than 0.5%
ANd if you search guru3d, you'll see that spending cartloads on ddr3 1600mhz + ram is useless except for everest benchmark and wiwrar speed, that too by a little.
I suggest get the lowest CAS Latency RAM available within your budget, as that will give you a true performance boost. ANd look out for a max of 1600 MHZ DDR3 with CL7 or CL6(if there).