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When looking at Mobo's I see Memory Standard, what exactly is that, like DDR2 800, that mean it will take any RAM 800Mhz and below?

Yes it will take the DDR2 800 PC (6400) standard. 

As long as it's regular DDR2 at whatever voltage your motherboard takes (if it's 1.8V, it will definitely work. If you have a good motherboard, higher voltages can be delivered

Looking over the motherboard, if you can find remarks of supporting a certain model ram,

 

theoretically speaking, you can choose rams with any brands, which meet the norms of

 

this model.

 

The reason is that there are standard requirements for both memories and the memory

 

interfaces, and the manufacturers must follow the request in producing. Therefore, the

 

productions are the same in functions, while the materials, workmanship and techniques

 

may have some differences.