Need help-selecting memory

I would stay away from that memory. Go with a value type of RAM from Corsair, OCZ, or Kingston <or other top tier brands>. All you need to do is specify 2x512 sticks of DDR400. It is alway good to pay a bit more for some better RAM and stability. One mans opinion.

Refer to this page for the qualified vendor list (QVL) for that board. The ^^poster is correct; that memory isn't even on the list. Here's the MSI site; memory listed by company, on the left:

http://www.msicomputer.com/product/p_spec.asp?model=RX4...

Just a quick search, on your behalf, and about the cheapest I found on the QVL was this Kingston chip, at $85:

http://www.newegg.com/Product/Product.asp?Item=N82E1682...

Good luck.