As mentioned: I want to buff my old rig for almost no money, while I get enough money to buy something decent. My specs are:
CPU
Intel Core i5 4430 @ 3.00GHz 48 °C
Haswell 22nm Technology
RAM
4,00GB Single-Channel DDR3 (9-9-9-24)
Motherboard
ASUSTeK COMPUTER INC. B85-PRO GAMER (SOCKET 1150) 26 °C
Graphics
VX24A (1920x1080@60Hz)
Intel HD Graphics 4600 (ASUStek Computer Inc)
Storage
465GB Samsung SSD 850 EVO 500GB (SSD) 33 °C
I want to be able to play Stellaris and CoW: Warzone decently, that's it
What GPU would do the trick? Can I change the RAM into DDR4? Can I get another CPU for next to nothing? What can be done if I want to spend the least amount of money on this temp rig?
Thanks in advance and have a nice weekend, people!
CPU
Intel Core i5 4430 @ 3.00GHz 48 °C
Haswell 22nm Technology
RAM
4,00GB Single-Channel DDR3 (9-9-9-24)
Motherboard
ASUSTeK COMPUTER INC. B85-PRO GAMER (SOCKET 1150) 26 °C
Graphics
VX24A (1920x1080@60Hz)
Intel HD Graphics 4600 (ASUStek Computer Inc)
Storage
465GB Samsung SSD 850 EVO 500GB (SSD) 33 °C
I want to be able to play Stellaris and CoW: Warzone decently, that's it

What GPU would do the trick? Can I change the RAM into DDR4? Can I get another CPU for next to nothing? What can be done if I want to spend the least amount of money on this temp rig?
Thanks in advance and have a nice weekend, people!