Windows 7 Home Premium 3.19 gb of RAM usable

As the title says, I only have 3.19 gb of RAM usable on a 64bit OS with 8 gb installed. I have checked my BIOS, it is up-to-date, but old. I have also checked Window's Resource Monitor, it knows 8gb is installed, but like earlier, can only use 3.19.

Yes I am positive it is 64 bit.

My motherboard is p45turbotwins2000. It recognizes that my RAM is installed.

I have 2x4 gb DDR3 sticks.

I just installed Windows 7 Home Premium 64bit. Nothing except Firefox has been installed.

All Windows updates are installed.

If you need anything past that, let me know. I'm at a loss.
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  1. I may have just solved my problem. I enabled Memory Remapping on my BIOS and my RAM magically just started working. If anyone can explain this to me, please do! Otherwise, go me!?
  2. Well done ! that`s what the feature is for in the bios to support a 64bit Os than can run upto 128Gb of memory. Or should I say so the board allows it to been seen by the working OS to access.
  3. Best answer
    Your first 3.19GB of RAM are your first, addressable in 32bit, memory locations. The rest is reserved for MMIO. Anything after that (your other 4GB), requires 64bit memory addresses. Normally MMIO is remapped and 64bit is used by default, your motherboard seems to not do that (for whatever crazy reason).
  4. Best answer selected by Raelor.
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