I couldnt find the feature to enable Physical Address Extension (PAE) / Memory Mapping to unlock i945GM Maximum Memory to 4GB. Currently my BIOS only can detect up to 3GB of RAM. I have tried to install Win 7 64 bit, and it did show installed memory as 4GB (3GB usable). anybody know how to unlock the PAE on Phoenix BIOS? or how to enable PAE using symbios program? Thanks!