compatible? intel dx38bt w/ ddr2 800

what do you mean?

Sorry, but the DX38BT will not even accept DDR2 memory of any kind. (Or put it this way, DDR2 memory will not even physically fit the memory slots of the DX38BT.) It accepts only DDR3 memory.
 
DDR3 in its current form, at least when used with current platforms, is a joke. Forget about it for the time being (at least until Nehalem is released) and any boards requiring it. You're paying a considerable price premium for zero real world performance increase.
 
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