Asus P4T533-C questions

Hi all.
I'm using an old Asus P4T533-C mb and would like to continue doing that, but upgrading the CPU from a P4 1.8 400FSB to something better.

I'm not new to computers but also not a wiz when it comes to understanding of tech. hardware. For example, my P4 cpu seem to be a Northwood. I've seen P4 Prescott around, and I suppose it's a newer version with "hyperthreading". Does anyone know if Prescott CPUs works with my MB?
When I bought the MB I was told it doesnt work, but I've read forums saying otherwise.

Is there a site where I can check what CPUs and RDRAMs are compatible with each other for my motherboard?

Basically, what I am trying to do is getting a faster CPU that works with this MB, and that also works well with RDRAM PC800. If anyone knows, I'd be most thankful.

Regards
Ulf