423 pin board to 478 pin CPU

I’m building An ASUS P4T-CM 423 pin 1.7 MHZ motherboard; I want to put a 478 pin CPU with an adapter. It’s a 400 FSB.
I want to know if it’s OK for this boaRD TO have the 478 pin CPU first?
And would it matter if the 478 pin had a 533 FSB or does it have to be 400 FSB only?