Hardware specs + bandwidth for webserver and database server?

Hi,
With the high traffic that i'm getting on my current website, i plan to split my current server into a web server and database server. The traffic assumption here is 100,000 hit daily. I'm running a social networking website (just like facebook).

I'd roughly drafted out the hardware specs + required bandwidth to "link" up these 2 servers together.

My questions would be:
1) Can somebody advise if the below specs right? Is there any redundancy or any tune down needed?
2) i believe i would need a 100Mbps uplink on my webserver to connect to the outside world (internet). However, how about the database server connection to the webserver? Does the database server use the ethernet connection of 1000Mbps to connect to the webserver? Or it require the normal internet bandwidth as the webserver (in this case 100Mbps).

Web Server Specs:
CPU: Single Intel Xeon 5405 Quad Core Harpertown Processors
Connection: 100 Mbps Uplink
Bandwidth: 2000 GB
RAM: 2 GB RAM
HDD: 146GB, 15K RPM SCSI/SAS Hard Drive. RAID 1 configuration.
 
Database Server Specs:
CPU: Dual Intel Xeon 5405 Quad Core Harpertown Processors ( 2 chips)
Connection: 100 Mbps Uplink (is this required?? or it will be running on ethernet 1000Mbps between webserver and database server?)
Bandwidth: 2000 GB
RAM: 4 GB RAM
HDD: 146GB, 15K RPM SCSI/SAS Hard Drive. RAID 1 configuration.