ProLiant BL495c G5 Server Blade (DDR2-800MHz) 2GB PC2-6400 DDR2 Memory Compaq ProLiant BL495c G5 Server Blade (DDR2-800MHz) RAM -2GB 240pin PC2-6400 DDR2-800 800Mhz Registered ECC DIMM. The price is for a single stick all systems require this memory in matching pairs must buy and install 2pcs FOR A KIT BUY Qty 2.