Good to hear you had such good luck. I had heard differently, but I stand corrected! Thanks.
Well, you are probably right about most other Dells, at least the ones older than my 4600. It seems that someone at Dell made a good command decision to move away from proprietary components.
My next step is to try to connect to my 4600 a new 320 GB Seagate 7200.10 SATA hard drive (Christmas present), keep the existing 120 GB SATA hard drive, and connect an old 40GB IDE hard drive...if I can. I think that the 430W Antec power supply will be able to handle it all. I hope that the Dell motherboard can handle it too.
If it blows up, I'll let you know. If it works just fine, I let you know even sooner.
So, the OS and programs will go on the 7200.10 320GB drive, my user files will go on the current 120 GB drive, and temp files such as temporary internet files and the OS swap file will go on the older 40 GB IDE drive.
Don't worry. I'll back up everything to an external hard drive before I begin. I've never slipstreamed Windows. So, I'll just reinstall the OS on the new drive and spend a few hours downloading the updates from Microsoft's website. I just hope that I know what I am doing. If you're a religious person, I'd appreciate some prayers.
OK. Everything worked. The Dell 4600 is now working fine with three internal hard drives (2 SATA, 1 IDE). The new Seagate 7200.10 320GB is nice, quiet, and faster than the 120 GB Western Digital originally supplied with the Dell 4600. The IDE hard drive is an old, noisy 10 GB Seagate which is now being used only for OS swap and temporary internet files.
The Antec 430W power supply, which replaced the one (240W ?) that came with the 4600, seems to be more than sufficient.
So far, then, I have successfully upgraded a Dell 4600 with an Antec power supply, additional 1GB stick of Crucial memory, and added a SATA and an IDE hard drive.
This is just to let people know that it is possible to upgrade some Dell PCs with non-proprietary hardware.