P5N-E SLI problem with 4Gb DDR2 Geil 800 Mhz

I have a problem....
I have a ASUS P5N-E SLI motherboard and 4x1 Gb DDR2 800 Mhz Dual Channel (Geil).
OS: Windows Vista Ultimate 64 bit
CPU E6300

My computer doesnt start with 4Gb, but start with 2 Gb. I don't now what to do.
I had XP 32bit, and my configuration shows only 3,26 Gb.....

Can anyone help me?
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More about problem ddr2 geil
  1. 4 sticks of ram should run at higher voltage to be stable. Set it up to specs in bios. Otherwise, it may post & that's it.
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