I recently (2018) bought new graphics card Radeon RX550 (2GB, 7000MHz) to my old PC(bought 2012).
Other components are: i3 3225 (3,3 GHz, 2 cores/4hreads) 8GB RAM (DDR3) Z77-D3H motherboard 500W power source
I tested few games and result was like "random". For instance, tried to run Mafia 2 video tests (something like 2 minutes demo that measures fps) and results were: average 55 fps, then I rerun test with same settings and got average 10 fps, after rerun again with same settings, get 30 fps average. I found similair results in other games as well. Weird is that If I see utilisation of my CPU and GPU, its is far from 100% utilisation(Windows task manager) - GPU fan is on low speed etc. Why it sometimes run ok and sometimes not?
How that is possible? I expect that with same computer, same settings I expect to get same results. Tried that on fresh installed Windows 10 and Windows 7, so no other programs are interrupting mentioned tests. Newest drivers were installed.
I do not expect to resolve that problem, I will return that GPU most probably, but Im interested if somebody can explain what is theory behind those random test results. What is happening there or how to figure? Is problematic that PC components are like 6 years old and GPU is new one? Is that game engine specific problem?
Thank you !!