In my opinion, the BEST DDR3 ever made was Samsung MV-3V4G3D-US_DDR3. The Green Stick.
I've been running 4 x's 4GB sticks (16GB's) of it at 1866Mhz 9-9-9-24-1T @ 1.34v for 2 years without a hiccup. My I7 2700K peeks at 4.8Ghz @ 1.34v - 24/7 - Great match ;o)
I know this Ram will do 2200Mhz's with looser timing @ below 1.55v (MB is an ASUS P8Z68ProV-Gen3). For Benching this i7 2700K SB will do 5.2 Ghz's comfortably @ 1.5 v; however, I've elected to run my rig at 1.34v under load and at approx .998v when idling. Temps are between 32C at idle and 67C, under load, for both the CPU and X-Fire 290X's.
The problem is finding it. I paid $96 for 16GB's of it delivered approx 2 years ago and that was in Canadian Currency - Hard to find and expensive now, even for used sticks.
It only comes in 4GB Sticks.
PS: I run the 2 x's 290X's in CF at 1180 x 1500Mhz's OC's at times - Water Cooled Box - But you don't have to use cooling on the Samsung MV-3V4G3D-US_DDR3 sticks as they're extreme low profile without heat sinks.
To date, I see no reason to upgrade my Z68 platform which very capable of running 4k gaming res.
Presently running a Korean Samsung IPS QNIX 2560 x 1440 Led screen at between 60 to 120 Hz - Dvi-D. Great Display for $300. You wanna play BF4 in Ultra Mode at over 100FPS off a Samsung 840 Pro SSD
