Fallout 4 upgrade

[KnightAnthony1]

Hello, I have a M4A785-M ASuSTek motherboard (AMD 785G) and I can support a AM2 AM2+ and an AM3 Cpu. The CPU I got now is a AMD Phenom 9850 x4 then the ram is DDR2. My graphics card is a AMD Radeon HD 7800 Series (doesn't list anything else in the name) but it has 1 gb of DDR3. So overall you can see that my pc is stuck in the dark ages of ddr2 and am3 cpu's and I wish to get a MAJOR upgrade! Can anyone throw me some well put together pc upgrades that is around $500? I know the budget is low but I would really like some ideas for how I could go with this. My goal is to be able to play some of the newer games out (Including fallout 4) with hitting atleast medium (ofc higher is better but with my budget and and the cost of things I dont know how well this will all turn out) If its over some I could always think about it!
Please and thank you!

 

[KnightAnthony1]

Ahh my PSU is also 750 watts in case anyone was wondering!

 

[CountDankula]

Get a used gtx 770 4gb on ebay for like a buck fifty

 

[Supahos]

http://pcpartpicker.com/p/3yLjzy pretty solid build, no OS, case(can reuse yours), or optical drive (might can reuse again, there is enough room to add one if u need to)

 

[Deleted member 217926]

If, and it's a big if, Fallout 4 needs anything close to the specs listed as minimum by Bethesda you aren't going to have a very good experience without some major upgrades.

Minimum

Windows 7/8/10 (64-bit OS required)
Intel Core i5-2300 2.8 GHz/AMD Phenom II X4 945 3.0 GHz or equivalent
8 GB RAM
30 GB free HDD space
NVIDIA GTX 550 Ti 2GB/AMD Radeon HD 7870 2GB or equivalent

Recommended

Windows 7/8/10 (64-bit OS required)
Intel Core i7 4790 3.6 GHz/AMD FX-9590 4.7 GHz or equivalent
8 GB RAM
30 GB free HDD space
NVIDIA GTX 780 3GB/AMD Radeon R9 290X 4GB or equivalent