The MSI one has 5ns memory and I beleive the LeadTek has 5.5 ns memory whcih means the MSI is clocked at 400mhz memory and the LeadTek is at 366mhz.
I have the MSI and it is great. I have the core overclocked to 240 and the memory at 490. I havn't tried to push it any higher. Everytime I up the speed it runs great.