"Not by much but noteworthy." LOL How does that work? But sure if you'd like your rig having to draw and dispense 100+ watts of internal heat for 3-5 more noteworthy FPS then knock yourself out.
Well, Fail.... The stupid power argument used by nVidia fanboys again... The R9 390 supports Vulkan, which ALL consoles use, if you hate console games and throw away the chance of good compatibility with future console ports, be my guest. Don't forget 8GB of VRAM, not the scam of 3.5+0.5VRAM that can't be disabled and dips your framerates like an satellite deorbiting. In all points, the R9 380 is better, and 100W more means nothing, except if you're in third world countries where you have 900W per household.
Is paying 50$ more per year REALLY significant compared to 20 000$ in taxes?