I didn't get around to posting this until now, but a couple days ago, I bought a Dell Dimension 4600 from someone who no longer had a use for it. It has a 2.8 GHz Pentium 4 (non-HT), 2GB of RAM (it had 3GB, but I had to remove some sticks because one of the RAM slots was broken), a 160GB SATA hard drive, an nVidia Geforce 6200 video card with 512MB of memory (didn't know they made GF6200s with that much RAM!), and a SATA DVD-ROM drive which surprisingly works great with this system.
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It also came with a generic PS/2 keyboard, a severely-yellowed Microsoft PS/2 Trackball, and the matching software restoration discs.
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This will be my sandbox/hardware testing system for testing IDE/SATA drives, AGP/PCI cards, DDR1 RAM, ATX power supplies, etc. I'm currently using it to DBAN my spare 320GB SATA hard drive as of this post.