HI, looking to upgrade my GPU so i can play fallout 4.
Do any of you guys happen to know a GPU that would fit my comp?
Price range between £50 to £150 is possible
Pic related, my specs.
>between £50 to £150 is possible
That's not possible, assuming you want to play it with reasonable graphics at a reasonable frame rate. You'll be looking at a GTX970 or an R9 390 - both £250 at least.
If you want a good deal for your money, 960 should be more than enough to run Witcher 3.
Just don't play it before Fallout, or else your ability to enjoy FO4 will be threatened.