X7270A 501-6962 CPU/Memory Board w/2 × US IV 1.35GHz, 8GB (16 × 512MB DIMMs) Memory X7273A 501-7058 CPU/Memory Board w/2 × USIV+ 1.5GHz, 8GB (16 × 512MB DIMMs) Memory X7274A CPU/Memory Board w/2 × USIV+ 1.5GHz, 16GB (16 × 1GB DIMMs)Memory X7300A-Z 501-7056 CPU/Memory Board w/2 × USIV+ 1.8GHz, 8GB (16 × 512MB DIMMs) Memory, RoHS:YL