64 Bit will let you use more than ~3.5 GB of ram, so that is key in your case. However, don't expect blazing performance under X (GUI) because there is no Propietary nvidia driver for 64-bit, although the NVS series aren't exactly 3d Performance All starts to begin with. I would say 100% go with 64 bit. The amd64 port is what you would use, rather than the IA64
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