While I like Corsair, I don't like nor recommend the XMS series (actually I'd opt for the Value kits first). Between the (2) the Mushkin. Most importantly, I never recommend a single stick of RAM. If you have a Dual Channel MOBO then purchase a kit especially where 8GB/stick density is concerned.
Cheap 2x8GB kits - Corsair CMV16GX3M2A1333C9 or Mushkin Model 997018 ; 6 of 1.
Actually the availability of more than one stick of xms is currently limited on newegg and four channel kits are unavailable for the mushkin, however; I think I can get away with purchasing four pairs of the mushkin for my needs... your thoughts ???
My machine is a mix of Mushkin an Corsair products, they are both excellent. With that said, I usually recommend Corsair Vengeance low-profile DDR3 ram for desktop use
I did notice the vengeance LP and liked it because it was a bit faster, however the CAS is 10 or 11 versus Mushkins 9.
I have been told that when going from one speed to the next, (ie. 1330 to 16 to 18), there is only a 2% increase, but I am unsure of what the overall performance of the RAM is when comparing the latencies.
Would you say it was more important to step up from 13 to 16 or keep a tighter latency say from 10 to 9 ???
Honestly I like the G.Skill memory great for the price.
G skill was one of my first picks when I first got started with this build, unfortunately I have heard many reports of aftermarket cpu fans having clearance problems with mobos that have RAM on both sides of the board, if and only if, one uses modules with the extra high heat spreaders or fins.
Since Intel does not include any cooling solutions for their 2011, I am relegated to an aftermarket cooling solution... eh, prob for the best anyway.