PSA: If you have an AMD R9 390, Vive game's probably aren't rendering correctly and this issue may be the cause of stutter / missed frames / lowered quality : r/Vive
MSI Radeon R9 390X Gaming 8GB
Radeon R9 390X Taken Apart to Reveal Radeon R9 290X - Legit Reviews
inRobert 85mm R9 390X GPU Cooling Fan for Sapphire Radeon R9 390 Nitro/R9 290X Tri-X Graphics Card Fan
How to know if I have a R9 390 or R9 390X? (Was I schemed?) | Tom's Hardware Forum