Ram slot issue???? help please

sam350

Distinguished
Mar 30, 2009
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18,510
system: gigabyte x58 extreme
ram g skill 2000mhz 3x2g
2 gtx295 quad sli
i7 920 @ 3.33ghz

I had alot of troubble running at 2000mhz on this board....after running 1600mhz for a while i was only getting 4g of my 6g of ram being reconised by windows.... allthough all 3 sticks pass a super pi and memtest at 2000mhz by them selves 1 at a time....as soon as i put the g skill stick int he 4th ram slot it won't be reconised.....but if i use a ocz stick in the 4th slot all is fine.....ram was rma'd still have the same issue.... it cant be the ram because they all work fine 1 at a time..... although its weird for a ram slot 2 be selective on what works and what doesnt.....IS THIS A MOTHERBOARD ISSUE??