Once in my PC this guy was already installed memory, I have DDR3 RAM Kingston HyperX PC3-12800 (1600 MHz, 240-pin) ordered me to upgrade with additional 8GB to full 16 GB. With my motherboard MSI P67A-GD65 B3 which worked well at first, and now I'm sick of memory. With a freeware program then another 4 GB RAM disk for various temporary files created. This speeds up my applications but significantly. I'm very happy with it and I recommend this type of memory you.