try 1600 rated set together first.
will 6 sticks fit. heat spreaders are somtimes to big.
not the OCZ. you myght be lucky and your stiks are fine. OCZ RAM has a bad rep right now.
run some bench marks like " maxmen " and prime95 see if it crashes ?
the coventional wisdom is eather a full set or two identical sets.
but yoiu never know unless you try it yourself.
you will likely have to push the voltage in bios.
try 1.65 V 9-9-9 24 2:8 T2
19 multy 199 QPI
Im running 1.337 Vcore but you should be able to do it with less with D0 stepping
1.225 VTT
1.075 ICH Vcore
All my voltges should be higher than yours IM on a C0/C!
I am running this its 3.79 Mh but with only 6 GB ram
To run a custum RAM set Up you will have to play in BIOS
Let the Fun Begin