CPU Type: Intel Xeon X3400/L3400 series Number of DDR3 Slots: 4 x 240pin Maximum Memory Supported: Supports up to 32 GB DDR3 ECC Registered memory (RDIMM) Supports up to 16 GB DDR3 ECC Un-Buffered memory (UDIMM) ECC Supported: Yes Registered: Yes PCI Express x8: 2 (x8) PCI-E 2.0 slot PCI Express x4: 1 (x4) PCI-E (using x8 slot) PCI Slots: 1