<< I have the MSI K7N420 Pro (MS-6373) and in the manual it says that it can support pc1600 and pc2100 ddr ram. I was wondering if anyone knew whether or not this board can also support pc2700, I check the MSI site but didn't see anything one it. >>
The memory you see sold as PC2700 is actually high quality PC2100 that can be safely overclocked to 166MHz (from 133MHz). It will work in your motherboard perfectly fine, and will increase your odds of overclocking it higher. Of course, there might be other limiting factors for overclocking...
Leo