HP Compaq dc5700 Base Model Small Form Factor PC. Processor front side bus: 533; 800; 1066 MHz. Maximum internal memory: 4 667 MHz DDR2 SDRAM, Cache internal: 256 KB L2; 512 KB L2; 1 L2; 2 L2; 4 L2. Memory upgrade: up tp 4 of DDR2 SDRAM. Above 3, all may not be available due to system resource requirements.