Windows 7 only recognises 2 gigs of 3 gigs installed

[hynesy]

Gday,

I bought a new computer today to replace my old crappy one and I am having an issue with my RAM, its not major by any means but is just a nuisance. The hardware is an Intel i5 750, the Mobo is an ASRock p55M Pro, the ram is 3 sticks of 1 gig each. As for the problem, Windows 7 x64 only shows that 2 gigs of ram DDR3 is installed when 3 gigs is installed. Now even though the RAM is DDR3 this mobo only supports dual channel ram, not triple channel, so I am thinking this might be causing the issue.

Cheers
Hynesy

PS I checked the bios post on boot and it does not recognize that 3 gigs is installed, there appears to be no settings for it in bios.

 

[Xecutor]

P55 mobos only support dual channel DDR3 RAM. If you have triple channel RAM, you'll have to exchange it for Dual Channel DDR3 RAM. X58 mobos are the only ones I think that support Dual and Triple Channel DDR3 RAM.

 

[kikkoman808]

if you realize that your video card memory has increased that means it took some ram from memory

 

[Tedster]

your OS and any onboard video will "eat" some of that ram.