DFI NF4 Ultra-D + 2GBS of Dual Channel Different Brand? Problems?

ok this is my situation

just got my first half of my Corsair Twinx XMS Pro PC4000 ram in the mail 1gb dual channel mad overclocking

anyways currently running that and took out my Kingston HyperX PC4200 1gb dual channel set....

anyways my new dfi board comes tuesday from newegg...

is it possible to run both sets? or should i just wait till my other 1gb dual channel set of corsair comes in?

I would recommend same modules or atleast ones with the same timings. Bear in mind that you have to run 1Gb first and set the timing to 2T ie CPC [Disabled]