Keep all sticks the same unless you want troubles. It's very simple advice.
I have installed in this system MD-x58i i7 XFX motherboard
with triple chanel NB.
on one set (3) I have Corsair 1333 Patriot 1.65v
works fine and BIOS reports 1066 (or whatever#)
now I add another set of Corsair 1333 1.5v
no boot unless I set the Memory freq. to X06
which then reports from BIOS 800mhz
when running cpu-z I get about 398mhz for each ram stick. now I read that tripple chanel will devide by 3 the NB
but why does the BIOS set at 800MHz? strange
System running stable but seems slower than when there is 6gb instead of 12gb
If you want to see the cpu-z screen shots I can email them to you
Any advise would be greatly appreciated
this system is driving me insane