[Red5] cpu / ram usage

[Access-Dev]

Hello the list

I m new here and what to use red5 to stream video at format 320x240 (without audio)

Could someone help me to estimate how much machine does i need to broadcast to 5000 users ?

My machines are core2duo 2.4Ghz + 2 GB RAM on Debian ETCH    and will be dedicated to red5 usage.

thanks in advance for any help , i gonna start some test soon but if someone could give my an idead would be great;)

Thanks in advance

Nico