[Red5] Server choices for Red5: A Double Dual Core CPU or a faster-clocked single core Pentium 4?

[Ed Wise]

Which server would be better suited for running Red5:

Pentium 4, 3.0 GHz
32-bit OS: Windows Server 2003 (Standard Edition) 

or

2x Dual Core AMD Opteron 2216 (2.4 GHz) 
(the web hosting company says "2 x 2 x 2.4 GHz")
64-bit OS: Windows Server 2003 (Standard Edition) 64-bit Edition

I guess this question kinda depends on whether or not Red5 takes advantage of dual core CPUs, which I suppose depends on if Java does, which I think it does.  In that case, the second choice would probably be better -- that is, if Red5/Java can distribute tasks/threads/whatever among the CPUs.  Can someone confirm that I'm right on this?  

Also is a 64-bit server (hardware and OS) okay for Red5?  And will that also yield better performance?

I want to consider just the CPUs, but if you really want to know the RAM, the Pentium 4 is 2GB and the double dual core is 8GB (and I suppose that is a big consideration).

Ed

P.S. Intended application is a one-to-many video/voice chat app (with text chat also) that should be able to accommodate up to 200 concurrent users spread out among about 10 rooms.  So, it should be able to handle up to 10 incoming concurrent video (and audio) streams (one from each room), each being streamed back out to all the users in the room it originated from (up to say, 50 users in a room).  (But total users in all 10 rooms would total 200 or less).

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