P5W DH Deluxe & PC5400 Memory

[galaxyy]

So I just bought the P5W DH Deluxe and am trying to use my PC5400 memory (Kingston HyperX KHX5400D2K2/1G) but I can't seem to get the system to power up. Kingston tells me that I can use the memory but ASUS' memory list is very sparsly populated.

Anyone know if the PC5400 should work? Should I just buy 6400 memory?

Thanks!