Dr. Bit says:
To help get you in the 2001 (xp) and/or 2009 (win7) mood, please open this or this in a new tab. Now, enjoy the RETRO!

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WinXP PC: Intel Core2 Duo E7500 @2.93Ghz, HD7850, 4GB Memory

I'm going to obtain another retro PC, but this time I'll be building it myself. The OS will be 32bit and dual boot winXP and Win7 (sorry Vista). I'll update as parts are decided upon and purchased. More info to follow soon! Below is what I have so far.
Note, I'm going with a micro ATX motherboard and a mini tower as i want to share the desk space with my 486 build.

Detailed component list:

CPU:         Intel Core 2 Duo E7500 2.93Ghz
CPU Cooler:  Zalman CNPS9500AT
Motherboard: Gigabyte GA-G41MT-S2P (rev 1.3) Micro ATX
Memory:      A-Tech 4GB DDR3 1066 MHz
GPU:         Sapphire Radeon HD 7850 1 GB
PSU:         Thermaltake Smart 500 W 80+

Case:        DIYPC DIY-F2-O Black/Orange Micro-ATX Mini Tower
Monitor:     LG LCD Flatron IPS235 23"
Disk:        750GB WD Caviar Black - WD7502AAEX
CD/DVD:      External USB PLDS DVD-RW DS8A5SH
OS:          Dual boot WinXP and Win7 (32bit)

Screenshots: (right click pick > open in new tab to view full size)



 








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