I'm wondering if this ever got resolved, and how? I have upgraded the BIOS to F.27, the latest HP Intel BIOS. As is reported above, the BIOS reports seeing 4096MB, but Windows is only seeing 3070MB. I have a DV9330CA running Windows Ultimate 64-bit. HP is selling pre-configured 64-bit machines with 4GB now, so there should be a way to get this right. The Chipset is an Intel 945GM which supports up to 4GB of RAM per Intel, yet I notice the above post mentions 8GB as a necessity - why? Does this mean a DV9000 series with an Intel 965 chipset supporting 8GB of RAM will display a full 4GB in Vista, but a 945 series will not? Help? Thanks.