Hardware upgrades on 12 year old stationary PC

[SO•Marty]

Yes, 64-bit Windows will be able to use all 8GB of RAM.

I am in the same boat actually, got a pc that is about to be 10 years old, but since it was meant to handle Vista it handles 7,8 en 10 without a problem.

Quadcore 2.6 non-overclocked CPU
8 GB RAM
1 TB HDD and a 500GB SSD laying around to be installed later
and an upgraded GPU, a nVidia GT640. Still nothing to write home about but at least it handles modern games a lil bit better.