nope windows 7 isnt resource hungry
If you want to run Windows 7 on your PC, here's what it takes:
■1 gigahertz (GHz) or faster 32-bit (x86) or 64-bit (x64) processor.
■512 (MB) RAM (32-bit) or 1 GB RAM (64-bit).
■16 GB available hard disk space (32-bit) or 20 GB (64-bit).
■DirectX 9 graphics device with WDDM 1.0 or higher driver.