Question about mobo compatibility w/ RAM

I just purchased a MSI 850E Max motherboard for some RDRAM that I had. I have 4 sticks of 256Mb Samsung 1066Mhz RDRAM and needed a motherboard for it. Anyway, I purchased the motherboard below for it:

http://www.msicomputer.com/product/...?model=850E_Max

Funny, the manufactuer that I purchased the motherboard from said on their product page that the motherboard will work with PC1066 RDRAM. Well, I popped open the manuel today and it said that the mobo supports PC600/800. It never said anything about supporting PC1066.

Question: I haven't installed the components yet. I am just asking you ahead of time to see if this mobo will still work with this RAM? I don't care if it runs at a lower speed (EX: PC800). I just need to know ahead of time if faster speed RAMs will still work in mobos that take slower speed RAMs. IF not, then you saved me a lot of time and work. Thanks!