Quote Originally Posted by Raja@ASUS View Post
tRRD 4 is real min internally in the chipset. Remember, bus is 64 bit wide. Can't send ACT before last burst of 4 clocks is complete. Settling lower register will just revert to min or arbitrary value.

exactly . i ever try to boot from 3 to 1 . Even boot up ,the performance is slower than 4 .