I have 2 sets of OCZ 6gb (mine and wifes builds) and 1 sets of corsair 6gb (one of my OCZ sticks went bad) , all work fine in both my wife and my GB x58. Currently I am using corsair dom. 1600mhz, 7,7,7 20 1.65v. My wife has same specs in her OCZ. Have not had any problem with either, except one of the OCZ sticks bit dust in mine, but that will occur with any brand...need to be less lazy and rma it, but just overnighted some corsair from newegg instead.
I would get 1600mhz minimum of whatever you want OCZ or Corsair, dont get 1333, price nearly same and 1333 will limit your options if it does not OC well.
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