i recently bought R9 280X second hand and performance in titles with Direct X 11 is great, but every Direct X 9 game (or lower) has very low GPU usage and very low FPS. I already tried reinstalling drivers, using different ones, reinstalling drivers with DDU, formating hardrive and installing system again and nothing worked. My CPU isn't bottlenecking my GPU or getting hot usage of my GPU with Direct X 11 games is at 99%. I posted this issue on other forum but it seems that nobody knows the answer. So my question is.. is this normal? AMD has poor support for older Direct X games or something? Or is this something from my side?
My specs are:
MOTHERBOARD: DELL 7010 (Bios version A29)
RAM: 4GB DDR3 (Running at 1333Mhz)
PSU: TRACER HIGHLANDER 600W (i know it's not the best one but it does the job)
GPU: RADEON R9 280X 3GB
HDD: SAMSUNG HD090HJ/P
OS: WINDOWS 7 ULTIMATE 64 BIT