Your CPU is over 10 years old and is holding back the performance of the newly released, RX 460. The reason you didn't notice this with the 4850 is the RX 460 is a lot more powerful. Unfortunately there is no way to resolve this other than upgrading to a more recent CPU.
The GCN architecture demands more CPU power than Terascale, so that is why you are seeing the dip in performance and btw your CPU is choking the performance of your PC in general.
are you using hdmi scaling?
1 of 2 people found this helpful
Aside from the cpu thing, try changing/lowering some global graphics setting.
SFO = off, Tess down to x8/x16, to start, may help in the meantime.
Disabling startup apps, and other unneccesary processes/overlays would take some load off cpu.
Thanks for all the responses;
I was not using hdmi, I lowered all the in game and global settings and just couldn't get it to run right on my old PC. It seemed no matter what settings in game (ultra or low) I tried I got the same results. My goal was to get a handful of games to run at 50 - 60 fps on high and didn't want to spend a ton as this PC is not my main.
I figured the rx 460 would be perfect but I couldn't even get GSGO to run without stuttering. My buddy lent me his 270x and it runs perfect! Constant 60fps in Rocket League maxed out. I'm going to return the rx 460 and track down a used 270x.