Xserve
Processor: One 2.8GHz Quad-Core Intel Xeon 5400 series processor
Installed DDR Memory: 2GB (2x1GB) 800MHz DDR2 ECC fully buffered DIMMs
Maximum Memory: 32 GB
Hard Drive Size: 80GB 7200-rpm SATA Apple Drive Module with 8MB cache
Expansion Slots: Optional

Processor: One 2.26GHz Quad-Core Intel Xeon 5500 series processor
Memory: 3GB (three 1GB) 1066MHz DDR3 ECC SDRAM
Storage: 160GB 7200-rpm SATA Apple Drive Module with 8MB of cache
Internal RAID: Optional
Internal solid-state drive: Optional
Expansion: Optional
Power supply:  Single 750W high-efficiency power supply
Rack support: Supports most industry-standard (EIA-310-D) four-post racks and cabinets with a rack depth of 24 inches to 36 inches deep; quick-deployment rails for square-hole racks eliminates need for cage nuts