I am using F4-3200C16D-32GVK, got it cheap a few months ago, 4x16GB double-sides hynix based Ram, on Asus c6h BIOS 1002, try all version after 0902. The max the RAM can post is DDR2400 using the memory drop down menu, loosening latency does not help.
Then I tried raising the ref clock to 120...