RAM speed problem with 8GB (4X2GB)


I have a Biostar 790gx 128m mobo in my build. The mobo itself supports up to 16GB of RAM.
I have installed in this computer 4X 2GB sticks of DDR2 1066 ram from g.skill (it was cheap).
I am dual booting Ubuntu 64 bit and XP 32 bit. I know of course that the 32 bit OS will only recognize
3.** GB of ram. Here's my problem: When I use 2 sticks of 1066 in XP, I actually get the 1066Mhz advertised speed. When I add the other 2 sticks, the RAM speed drops down to 533MHz, which looks suspiciously like half the frequency.

When I upgrade XP 32 to a 64 bit OS, will I unlock full speed of my RAM? Is this an OS or a Mobo issue?

Thanks in advance
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More about speed problem 4x2gb
  1. You have DDR2 memory so it is only gonna give half the speed but because it is Double Data rate it will be 1066, and the reason the speed drops with two more sticks is because......I think, not sure, cuz you are running dual channel
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