Setup Guide
Page 65
...System chipset Studio XPS 1640 Intel PM45 Studio XPS 1645/1647 Data bus width Intel PM55 64 bits DRAM bus width Graphics bus dual channel (2) 64-bit buses PCI-E X16 PCI bus 32 bits Processor address bus width Flash EPROM 32 bits Studio XPS 1640 16 Mbit Studio XPS 1645/1647... Studio XPS 1640/1647 1066 MHz DDR3 SO‑DIMM Studio XPS 1645 1333 MHz DDR3 SO‑DIMM Memory configuration possible Studio XPS 1640 1 GB, 2 GB, 3 GB, and 4 GB Studio XPS 1645/1647 1 GB, 2 GB, 3 GB, 4 GB, and 8 GB NOTE: For instructions on upgrading your memory, see the Service Manual at support.dell....
...System chipset Studio XPS 1640 Intel PM45 Studio XPS 1645/1647 Data bus width Intel PM55 64 bits DRAM bus width Graphics bus dual channel (2) 64-bit buses PCI-E X16 PCI bus 32 bits Processor address bus width Flash EPROM 32 bits Studio XPS 1640 16 Mbit Studio XPS 1645/1647... Studio XPS 1640/1647 1066 MHz DDR3 SO‑DIMM Studio XPS 1645 1333 MHz DDR3 SO‑DIMM Memory configuration possible Studio XPS 1640 1 GB, 2 GB, 3 GB, and 4 GB Studio XPS 1645/1647 1 GB, 2 GB, 3 GB, 4 GB, and 8 GB NOTE: For instructions on upgrading your memory, see the Service Manual at support.dell....