X7270A CPU/Memory Board w/2 × US IV 1.35GHz, 8GB (16 × 512MB DIMMs) Memory 501-6962 CPU/Memory Board w/2 × US IV 1.35GHz, 0MB X7270A-Z CPU/Memory Board w/2 × USIV 1.35GHz, 8GB (16 × 512MB DIMMs) 501-7305 CPU/Memory Board w/2 × USIV 1.35GHz, 0MB X7273A CPU/Memory Board w/2 × USIV+ 1.5GHz, 8GB (16 × 512MB DIMMs) 501-7058 CPU/Memory Board w/2 × USIV+ 1.5GHz, 0MB X7273A-Z CPU/Memory Board w/2 × USIV+ 1.5GHz, 8GB (16 × 512MB DIMMs) 501-7481 CPU/Memory Board w/2 × USIV+ 1.5GHz, 0MB, RoHS:YL X7274A CPU/Memory Board w/2 × USIV+ 1.5GHz, 16GB (16 × 1GB DIMMs)501-X7274A-Z CPU/Memory Board w/2 × USIV+ 1.5GHz, 16GB (16 × 1GB DIMMs) 501-7481 CPU/Memory Board w/2 × USIV+ 1.5GHz, 0MB, RoHS:YL X727** CPU/Memory Board w/2 × USIV 1.35GHz, 16GB (16 × 1GB DIMMs) 501-X727**-Z CPU/Memory Board w/2 × USIV 1.35GHz, 16GB (16 × 1GB DIMMs) 501-7305 CPU/Memory Board w/2 × USIV 1.35GHz, 0MB (Jaguar, 1.35GHz X7300A-Z CPU/Memory Board w/2 × USIV+ 1.8GHz, 8GB (16 ×512MBDIMMs)