As strange as it might seem (but being on MSFN, I don't think I will be regarded as a nutjob), this is my main computer. It's the RDD, the Retro Daily Driver. It is my main computer, as well as being the development system for the UOC Patch. While it's old, it runs very fast thanks to two reasons: it's overclocked and it uses formerly high end parts.
These are the specs:
CPU: Intel Pentium !!!-S 1.4GHz overclocked to 1.5GHz (Tualatin core, Socket 370)
M/B: QDI Advance 10T (VIA Apollo Pro 133T)
RAM: 1.5GB PC133 SDRAM
GPU: Gecube Radeon X1950 Pro
Storage: 1x Western Digital Blue 500GB SSD, 1x Western Digital Velociraptor 300GB HDD
Audio: Creative Sound Blaster AWE64 Value CT4520 ISA
LAN: 3Com 3C905C TX-M 10/100
OS: Microsoft Windows XP Professional SP3, modified to consume as little RAM as possible, the UI has been replaced by a Windows 3.x styled one with Stardock Windowblinds 5.1.
I still need to do some other upgrades on the RDD. Mostly, I need to add another SSD, replace the CPU with a Tualatin SL6BY, which I've read that can overclock more than its predecessor, the SL5XL Tually. I also need to check out if I can get a Radeon HD3850 or an HD4670 to work reliably on my motherboard, or else I will get another X1950 Pro.