HP Compaq dc7800 Base Model Small Form Factor PC. Processor front side bus: 800; 1066; 1333 MHz. Maximum internal memory: 8 800 MHz DDR2 SDRAM. Minimum RAM: 512 667 MHz DDR2 SD. Cache internal: 512 KB L2; 1 L2; 2 L2; 4 L2; 6 L2; 8 L2; 12 L2. Memory upgrade: