RAM

[Lendryn]

What would you suggest I do? I can go buy another 4gb card which would put me over my softwares limits but would it effect things negative compared to having an open slot? My motherboard is an ASUS P6T SE.

There will be no negative effect to adding the 3rd stick. However, you will likely see negligible difference by adding it to what you already have in your system (to enable the triple channel capabilities). If the new RAM has significantly lower latency (or perhaps higher frequency and you're into overclocking) and you have spare $$$ to blow then there may be some merit in what your brother suggested--i.e. add a 3rd 4GB stick and ditch the 3x2's. If not then you will likely see little to no difference in gaming performance by doing so and would not be enough of a benefit to justify spending the money, in my opinion.