Which BIOS revision?
How many DIMM modules? Does 1600 works with only 2 installed?
Did you select 1600 with menu or used XMS option?
Is the ram voltage set to 1.5v when you up the speed to 1600Mhz.If not try 1600Mhz@1.5v
Crucial Recommends using 1.35 volt Ram with this board , Check their web site it comes in several varieties . With your CPU and this Board you do not want 1.5 Volt RAM.
I tried to set the Ram speed to 1600 Mhz and 1.5 V but theres still 3 beeps