1200 (OC) ram on M4A78-EM Motherboard

I have an ASUS M4A78-EM motherboard and currently my ram is set at 1066 MHz (factory default), my motherboard has the ability to overclock memory to 1200 MHz in the bios, but it will not give me the option to. When I go into the bios, I can only choose 533 MHz (which times 2 is 1066 MHz), but there is no option for 600 MHz, is there a reason why?

Motherboard: M4A78-EM
Processor: AMD Phenom II X3 720 BE (Overclocked @ 3350 MHz)
Video Card: Nvidia 8600 GTS
Ram: 2 X G.SKILL DDR2 1066 MHz
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  1. I actually found the answer on a separate forum, turns out I need to make my FSB at least 225 before the BIOS will allow me to choose 600 MHz.
  2. Here is the source at which I found the answer: http://forums.anandtech.com/showthread.php?t=2110688

    I can't seem to overclock my FSB to 225 so I will have to deal with 1066 MHz :\
  3. My BIOS version is: Version 0312 (Factory default)

    My overclocking options are ok, I can adjust my multiplier (BE processor), FSB, GPU, PCIE, HyperTransport, Memory Clock etc. The only problem with my BIOS is that adjusting the voltages is REALLY bad with this mobo. I have only three options to add voltage to my CPU, +50mv, +100mv, and +150mv. I can't even define a custom voltage for my CPU, hence why I can't make my FSB 225.
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