Server sizing

I am currently sizing web servers for shared hosting. Looking at:

1. Single P4 2GHz, 1 to 2 GB RAM, and h/w raid 1 SCSI.

2. Dual Xeon DP, 1 to 2 GB RAM, and h/w raid 1 SCSI.

I will be running Windows and Linux based web server. Any ideas on the number of domains each box will run if they are serving small personal web sites and mail?

Thanks.

 

 

 

 

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