Nope.
First of all, I highly recommend an INTEL setup using an i5-4690K or similar.
As for the video card, I recommend a GTX970 instead. The R9-390 may have 8GB mainly for "future proofing" but the GTX970 has many benefits:
- overclocks higher (stock R9-390 is pretty much maxed)
- DX12_1 vs DX12_0
- PhysX
- MFAA (boosts supported games a bit)
- HUD optimizations
- H.265 (unless that's added to R9-390?)
- HDMI 2 (4K@60Hz)
- voxel lighting support (future games)
- less HEAT output (makes a HUGE difference in small rooms)