Lubomir_3 :
I dont have a working rig and i am buying the parts next week. If the difference is big i will buy the r9 390 but i wont buy myself a monitor and if the difference isnt visible i will buy both monitor and graphics card. That is why i am asking you for help. I cant decide.
Ofcourse there is a visible difference, there is a big gap between the two GPU's. You can push the R9 390 8GB a lot further on graphics settings compared to the R9 380 4GB. The question is, does this matter to you? If highest settings and high fps matters, then get the 390. If this doesn't matter so much and you just want good graphics, quite a bit better than the PS4, then the R9 380 4GB is fine along with a good monitor.