superstition :
If you have a Microcenter near:
AMD FX 6300 six core cpu — $90
ASRock 970M Pro3 AM3 mATX board — $10 AR with bundle pricing
$123 total with tax
from Newegg:
If you want to play Fallout 4, you're better off going with an Intel i3. Not everyone has access to a Micro Center - and while that is a good option, FX processors just don't hold their value anymore. An Intel i3 and a GTX 950 would be the best option you could go with. If you're buying a whole new system you can get such a one for around the $500 range.
That PC model can have 240W PSU or 320W PSU. If you have the 320W, then getting the GTX 750 TI will be your best option for the GPU - it's cheap, cool, quiet, powerful, and only uses power from the motherboard.
320W PSU???? Why???? Get at minimum a 450W, which can be had for $40 - $50 right now for a quality Seasonic or EVGA GS right now. The B2 series are retailing for below $60 too and that's a solid option.