ASUS P4T533-C RDRAM Support?

[Daemonia]

I have a P4T533-C with two Sync Max SM128R364A-845 128MB/4 non-ECC using configuration A.

I wish to buy additional RDRAM but I was wondering if I could install an additional two 256MB or do I have to have all 4 slots the same type?

Does the RAM manufacturer matter too?

Thanks,