1866mhz with cas latency of 8-9-9-24 http://www.gskill.com/en/product/f3-14900cl8d-8gbxm or 1600mhz 7-8-7-24 http://www.gskill.com/en/product/f3-12800cl7d-8gbxh- ? Now, i've been using two sticks of this memory http://www.gskill.com/en/product/f3-10666cl7d-8gbxh for half a year, because earlier i was using AMD's Phenom II 965 BE processor. Or i should just stick to using that memory, because upgrade wont make big difference?