I have two of the SC420 servers that were bought under the Dell Promo special on Dec 12. One with P4 2.8 160G SATA and one with the Celeron 2.53 80G Sata.
Both systems cost less than $590..delivered....COMBINED....!
One is still in the box (Celeron) and the other is set up as a DESKTOP...regardless of what Dell would have you believe.
The PCIe slot modification was easily done with the careful application of a soldering iron to remove two small plastic dividers. Minimal cleanup was required using a utility knife and an ATI X700Pro 256K video card was installed with no problem. You just have to be careful not to damage the socket with excessive heat or bend any of the contact pins.
Anyone who says this machine cannot be used for games....has not tried it. With the P4 2.8 and 1G of PC2-4200 DDR2 memory ( additional memory modules added after delivery), using the X700Pro video card ...It is VERY fast...!
You will need to add a PCI modem card ($15) (or cable modem card)and a PCI sound card ($25)
The fan noise is not silent, but it is far less obtrusive than the AMD 1.3 G desktop it replaced. For my purpose it is very acceptable.
The only issue is loading the correct drivers needed for your desktop operating system as Dell made the installation a bit more tedious by concentrating only on including server Op system drivers. But the drivers needed for Win 2000 Pro and WinXP are available. Some are common to the server drivers on the supplied Dell driver CD. But a trip to the Microsoft web site to insure your Op system has the latest Service Pack updates and any needed drivers will complete the system.
I don't think you can buy more bang for the buck.
However, it is not a good choice for those who want to take a new desktop out of the box, plug it in, and begin playing games. If that is your expectation...look elsewhere. ( 4700, 8400) But expect to pay twice as much for the convienience.
The SC420 is an EXCELLENT base on which a knowledgeable person , willing to do a little extra work, can build a super system for CHEAP...!
Also the following web site has become an excellent resource on this particular model, describing what modifcations are needed and what video components / drivers have been successful.
http://www.aaltonen.us/forums/viewforum.php?f=4
Kerry