That might work, but I have 2 sticks of 2gb ddr2, a AMD phenom 2 and a PSU which I suspect of being capable of exploding everytime I turn on the pc, it is a pre build. And the hard drive can't be used by me either since it contains photos and such. We only have 1 desktop pc and a bunch of very slow and even worse laptops at our place. Which means that I can only reuse the case.
So if I were to buy 2 sticks of 4gb ddr3 ram I would spend about €40. A decent PSU will cost about €50-80. And if I want any upgradability I can't just buy the cheapest m atx motherboard, which means I will spend between €50-100.
That will be about €160. A Rx 480 will cost about €300. A €40 CPU won't be able to handle game development.