Unknown-bjorn :
I am buying the i5 3570K. The dominator (1866) will cost me R850 which is $85 currently. and a vengance 4gb 1600 1.5V XMP will cost me R490 ($49) and an 6gb Vengance CL8 will cost me $95
most odd... here the 2x2 dominator is £46 about $90-100
whereas 2x4 vengeance cas 9 freq 1600 is £41 minimum.
but still overall cost your plan for 2 sets of 2x2 will cost... $180 dollars and will strain your memory controller, and you cant use the full potential of it as your system is mostly limited to 1.5v
but 2 4gb vengeances will be $98, and you can buy a $12 fan (equivalent of course) to do the job of the free one.
The dominator line are for extreme record setting overclockers. the vengeance are the main standard for mild overclockers and gamers etc.