I had 2x2GB Kingston HyperX Blu KHX1600C9AD3B1K2/4G
(linked to its data sheet) kit installed one year ago and now I looked everywhere for the same as a kit or even separately, but could not find any anywhere.
I, however, managed to get 2x4GB of kit Kingston HyperX T1 KHX1600C9D3T1BK3/12GX
(linked as well) which is almost the same (Frequency, timing and of course brand).
I installed the first 2x2GB kit in slots 1 & 3 then the newer couple in 2 & 4.
So far everything seems pretty much stable and satisfying; no beeps, lock ups, slowdowns, restarts, etc., and from the first try the system managed to read the 12GB just fine. Tests included hours of modern gaming (id's Rage), hours of movies and Winrar compression while installing Win7 x64 in a virtual machine.
The later set is apparently the more advanced one and at least it has a bigger heat sink and XMP feature supported (dunno what that is, but it's there).
Some how I feel a better configuration could be done here and I did what I did by researching and not actual technical experience.
With my system mentioned in my signature, I would like to hear Advise, Criticism and Commentary (if any).
Thank you in advance.