Ok im a little confused im running an ivy 3770k with 4 stick or corsair 1600 mem set to xmp profiles, cpu-z reports the memory running at 1600 however it reports the max memory bandwidth of 667, however ive ready thats due to the cpu connection, but doesnt the ivy have a 1600 memory bus? Ive ran through the bios settings setting the dram to cpu ration to 100:100 auto drops my memory speed to 1400 (667) I can force it up to 1600 but is that the right thing to do and shouldnt it do it on its own? Im running a z77 sabertooth so everything should be running at 1600 I just cant work out why it isnt