Some new PC build troubles. Help please

[un1d3n]

I just bought a new rig and put it together the other day

q6600
8800gts
MSI p79 diamond (the 780i one)
4 gbs of ram from G.skill

and other such things

its running just fine, without two gb of ram, for some reason with vista x64 ultimate, i can not get 4 gb of RAM working, and I think it may just be an issue of compatibility with the mobo and the ram. any ideas?

Also, currently the gfx is not on a pcie 2.0 slot as when I was setting it up, it only worked on a basic, would putting it on a 2.0 slot now be ok?

[mrt9888]

In the BIOS there should be something called memory remapping, turn it on ad it fix the problem.

[un1d3n]

I dont see this option anywhere, could you specify where exactly i should be seeing this and what it does exactly so i don't blindly turn on options?

[Thorsson]

Actually the problem is probably that you don't have the correct voltage for your RAM. Most mobos default to 1.8v whereas most of the brand name RAM wants ~2.1v. Check your specs and change it. Sometimes the MCH voltage needs upping a notch too.

[un1d3n]

Thanks, ill take a look into that.
Why then, does it work with 2gb instead of none at all if the required voltage is 2.1 and its running at 1.8?

[un1d3n]

EDIT:: the voltage is already at 2.1

I didnt see a MCH voltage option though. what is that?

[Thorsson]

That's the voltage to the main Northbridge chip. Sometimes it needs some extra power with 4 RAM sticks. You may have to find someone who has your board if you can't find the option.

[Bounty_Bam]

Maybe try installing the 4GB RAM patch for vista x64?

Error message when you try to install Windows Vista on a computer that uses more than 3 GB of RAM: "STOP 0x0000000A"

Take 2GB out, instasll patch, put 2GB back in

[Thorsson]

Maybe try installing the 4GB RAM patch for vista x64?

Error message when you try to install Windows Vista on a computer that uses more than 3 GB of RAM: "STOP 0x0000000A"

Take 2GB out, instasll patch, put 2GB back in

That's an error message on install, and you'd have to have a Storport miniport, unusual in a home PC, to say the least.

[Thorsson]

Is that motherboard the P7N Diamond? I couldn't find a P79 Diamond. If so then I think you can only try NB voltage. According to Anandtech, on MSI's X48 board turning this up too much caused system instability, so only take it up one notch, although I found someome OCing the board who had taken it up to 1.375 (NB to hot to touch though). I also found someone running 4x2Gb GSkill in that board without problems.

Another thought. What's your PSU?