Corsair Value Select CMV4GX3M1A1333C9 4GB DDR3 SDRAM Memory Module - For Desktop PC - 4 GB (1 x 4GB) - DDR3-1333/PC3-10666 DDR3 SDRAM - 1333 MHz - CL9 - 1.50 V - 240-pin - DIMM - Lifetime Warranty

No matter how heavy and numerous the applications that you are using, 1333 MHz memory speed will run them smoothly 4 GB memory smoothly executes complex apps and games 240-pin-pin DDR3 SDRAM interface multiplexes 2-bit data from memory cell and I/O buses to minimize processor idle time and enhance your computers performance