ProLiant BL25p 2GB Kit PC3200 DDR Memory Compaq ProLiant BL25p RAM -Hynix Original 2Gb 184pin DDR DIMM ECC Registered 256Mx72 gold leads 2.6 volts PC3200 spec 400Mhz with SPD CAS 3 latency. Most machines require this memory installed in maching pairs. Please buy and install 2pcs for pair or 4GB kit.