Unless you are overclocking, I think most RAM is pretty generic. Look for 1.5V or less. Here's one example
of better than average.
Especially with Intel integrated graphics the MHz advantage is purely for CPU overclocking: http://hexus.net/tech/reviews/ram/38613-gskill-tridentx-ddr3-2400-ivy-bridge-memory/?page=6
. The Samsung sticks Steve linked performed very well in the review. I can personally recommend G.Skill Snipers, in case the Samsungs are not available; 1.25 V, DDR3-1600, CL9, low heatspreader. Low heatspreaders are good for compatibility (as huge heatspreaders provide little to no thermal advantage anyway), and low voltage is a case of "why the hell would you use high voltage". Since there's no public research into it, I can't link reviews or theses, but I'm pretty sure there's a valid reason why companies have been dropping the voltage with every generation of DDR SDRAM. From experience I take it and/or low CL as a sign of higher quality (overclockable) chips.
Oh, and definitely go for the HD 4000. Been quite happy gaming with mine, although I have an i5. Examples of games played: Assassin's Creed 2 & Brotherhood (1440x900), Dota 2 (1680x1050), Spec Ops: The Line (1920x1200), all Company of Heroes titles (1920x1200), Guild Wars 2 (1920x1200). All played with stock clocks and 1600/CL9 RAM. The lower resolutions are so I could bump up visual quality and have more responsiveness.
PS. Never confuse Thermaltake and Thermalright
. If there is a way to make something noisy, Thermaltake
will find it. (as a wise man once said)