Memory4 6 DIMM slots, up to 24 GB (expected availability May 2009), 6-channel DDR3 1333 MHz., 3 channels per CPU (.actual memory speed dependent on processor capability) Drive controllers 5 Integrated SATA 3 GB/s controller, RAID 0, 1, 5, 10 capable; Optional SAS controller, LSI 3041E 4-port SAS/SATA, RAID 0. HP Z640 PC Workstation E5-2680 V4 Ram 32GB DDR4 HDD 1TB EGP 12,500.00 EGP 12,800.00 Portable Game Grip K21 Mobile Game Controller Joystick,Gamepad for 4.7-6.5 inch iPhone & Android Phone EGP 80.00 EGP 110.00. The Z600 supports Unbuffered 1GB single rank, 2GB and 4GB dual rank PC3-10600E 1333MHZ ECC DIMMs In dual processor configurations, each processor must have memory connected to it. The CPUs determine the speed at which the memory is clocked. You can upgrade your HP Z600 Workstation Computer to up to a maximum memory capacity of 24GB (ECC) / 48 GB (ECC-REG) (Make sure system is ECC or Reg-ECC) Memory. How many total memory slots to install memory? The Computer has 6 Sockets (2 banks of 3)to install memory, already with 1GB to 8GB (Removable) standard memory installed. Unbuffered, non-registered DIMM memory modules have no buffer/register component between the DRAM modules and the motherboard memory controller. What HP Workstation Z600 memory speed is supported? DDR3-1066 and DDR3-1333. Why may there be various speeds of HP Workstation Z600 memory? Some servers often have various configurations and versions.