HP 20-1F88A-01 - 1GB ECC RIMM, 800Mhz, 288Mb, 40ns (16 device) - Only Supported on 1000/1150 Mhz cpu`s Retail
HP 20-0F87A-01 - 1GB ECC RIMM, 800Mhz, 288Mb, 40ns (32 device) - Only Supported on 1000/1150 Mhz cpu`s Retail