CPU and Ram

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The mobo specs from the link above ... RAMs @ stock --->

4 x240-pin DIMM, Max. 8 GB, DDR2 1066 / 800 / 667 / 533

As noted, you will be able to 'downclock' the RAMs to the 800MHz stock spec of the X2 5600+ or (hopefully, successfully) increase the speed of the base clock to better utilize the capability of your memory.