wondering how much a server can take

Using a server with 3.06 GHz Hyper-Threaded with 1 gig of DDR ram, (OS: Plesk) will I be able to run the following:

1 x 14 slot CS gameserver
1 x 20 slot CS gameserver
2 x Ventrilo Servers
5 x Sites (I guess not really intensive and is more based on my hard drive space right?)
1 x Email Service

Can I load the server up with more applications or should I stop here?

(Thanks in advance, and sorry if I posted in the wrong area)

 

 

 

 

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