I have an R9 390, and the current experience is terrible. Although 3DMark says that my GPU is adequate for a 390, Cinebench does not because it proves 96 fps when my card should reach 130; I know the cause, but not the solution. Some stutter that is fixed with third party applications, but there is a problem that no one seems to know the answer to: regardless of resolution or settings, I never, NEVER get better or worse FPS. Sounds good, but it isn't because in games such as Far Cry 4 where I dip in the low 50s and mid 40s (which is where my freesync range goes to shit) I cannot dip the settings to get a smooth frame rate. I have an i5 6500, which does NOT bottleneck a 390, 1x8 GB RAM, a Corsair RM650x and good thermals. No it is not due to lack of optimization in games, but a problem with the driver of my card, some sort of power saving feature I can't find. No power save features are turned on in the AMD drivers, or windows C. Panel, the PCI-E slot in C. Panel does not have any power saving features on, and my PSU should be enough. No, I don't use V-Sync, and the wattage profile in the AMD driver is set to 50+, and "Ultra Power Saving" or whatever option is turned off in a third party app. the answer is not obvious, I am sure of that, so I want someone with experience on this.
Downloading a gaming bios for my 390
Re seating RAM
Re seating the GPU
Using two power cables, not a split 8+6
Overclocking (which causes artifacts)
Turning it off and back on again
Turning off freesync
Updating MOBO Bios
Latest Intel driver
Uninstalled old drivers
I can't switch my PCI-E slot to the bottom one since my card is too long, lol.
Anybody with similar experiences both on AMD or NVidia that fixed this problem by fiddling with the BIOS or windows settings (I have an Asus mobo btw), but does not require reinstalling windows, or formatting my HDD and SSD (because fuck that shit).