Unable to run 800Mhz memory on 975X Platinum PowerUp

hi,
I can't get my MSI board to recognize my 800mhz memory, it runs at 667mhz although it's 2x1GB Corsair XMS2-6400 4-4-4-12 2.1v. If I run CPU-Z, the SPD shows everything correctly, but I had to change the timing values manually, it defaults to 5-5-5-15 if I select "by SPD" in the BIOS. I'm running version 7.2 of the BIOS.
I'm pretty much a newbie when it comes to overclocking and tweaking BIOS settings, I just want it run at the correct speed and preferably not overclock at all.
Thanks in advance,
~ kiri

This is what they are saying for the version II
975X Platinum V.2
http://www.msicomputer.com/product/p_spec.asp?model=975X_Platinum_V.2&class=mb
Main Memory 
    • Supports 4 unbuffered DIMM of 1.8 Volt DDR2 SDRAM 
• Supports up to 8GB memory size 
• Support Dual Channel DDR2 533/677/800MHz and up
    Due to the High Performance Memory design, motherboards or system configurations may or may not operate smoothly at the JEDEC (Joint Electron Device Engineering Council) standard settings (BIOS Default on the motherboard) such as DDR2 voltage, memory speeds and memory timing. Please confirm and adjust your memory setting in the BIOS accordingly for better system stability.
Example: Kingston HyperX DDR2-800 PC6400 operates at 2.0V, 4-4-4-12.
For more information about specification of high performance memory modules, please check with your Memory Manufactures for more details.
Gaucho

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