My 8GB DDR4 Ramdisk speed is insane, and far better than I could have hoped coming from a DDR3 system. It's using 8GB out of 16GB G.Skill DDR4 2133MHz as a Ramdisk for saving large bootable ISO files from UltraISO, and testing them in VMware. Here are my scores: With my last PC build using 6GB of DDR3, I only got ~2,800 MB/s Read, and ~3,200 MB/s Write. So I nearly tripled my Ramdisk speed with this i7 6700 build. I have another set of 16GB sticks coming to give me 32GB total to play with. I am more than impressed with this build.