Windows 7: which version for which Pentium? - Super User
Gateway 702GE MT Intel Pentium 4 3.2GHz 1GB RAM No HDD No OS
Windows 7 was made to run on a mere 5MHz Pentium, 128MB RAM and it worked, mostly - Neowin
Windows 7: How Low Can You Go? - HardwareZone.com.sg
Windows 7 was made to run on a mere 5MHz Pentium, 128MB RAM and it worked, mostly - Neowin
Amazon.com: HP Computer Desktop Core 2 Duo 1.8GHz, Windows 7 Professional, DVD Drive, New 1GB RAM, 80GB Hard Drive, New Keyboard Mouse-(Certified Reconditioned) : Electronics
Refurbished: IBM Lenovo ThinkCentre S50 Desktop PC Pentium 4 2.8GHz 1GB RAM 40GB HDD Windows 7 Home Premium 32bit Desktop Computers - Newegg.com