Only 2GB RAM working in Windows 7 64-bit

Hi there,
We have a 2x 3.2Ghz Quad-Core Mac Pro with 12GB DDR2 800 PC2 6400 (iRAM IR4GMP800K), running Snow Leopard 10.6.4 and Boot Camp updated to 3.1. All 12GB of RAM show up just fine in Snow Leopard.
We just installed a new 1TB SATA drive, created a Boot Camp partition, and installed Windows 7 64-bit on it.
Installation went fine, and the OS seems to run okay. However, only 2GB are showing up in the System Properties. It does name the OS as Windows 7 64-bit.
We tried to install the 64-bit drivers in the Boot Camp / Drivers / Apple folder on the Snow Leopard DVD, but didn't seem to help.
Any ideas?

Yes, purchased it retail. This is exactly what we bought and the disc that was installed:
http://www.newegg.com/Product/Product.aspx?Item=N82E16832116758
I was thinking about the actual RAM too. When we installed the iRAM, we pulled the 4GB stock Apple RAM. I can try to put that back in tomorrow I suppose, and see what happens.
Also worth noting the ram is installed as such:
Board A: 4 x 2GB modules
Board B: 2 x 2GB modules
Do you think the slots we used might have something to do with it?

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