Compatible Memory (RAM) Replacement for Hynix HMT151R7BFR4C-G7 | 4GB Module ( 1 x 4GB ) | DDR3 1066 MHz / 1067 MHz ( PC3-8500 / PC3-8500R ) | DDR3 DIMM ( 240-Pin ) | ECC RDIMM ( Registered DIMM ) | 2Rx4 - Dual Rank x4 | 1.5V - DDR3 Standard Voltage | Only Compatible with Select SERVERS and WORKSTATIONS *NOT Compatible with DESKTOP or LAPTOP systems* | Maximizes the performance of your system by speeding up loading times, boosting responsiveness, and improving the ability to support greater workloads | A-Tech provides a Lifetime Warranty for all orders & offers complimentary United States based Tech Support before, during, & after your purchase