Fps issue since pc upgrade

Hello, as you can read in the title i've upgraded my pc from an amd quad core @ 3.2 ghz and a r7 2gb graphics card to an amd quad core @ 4.0 ghz and the newer rx560 4gb graphics card.The big problem is that with the old pc i had an average of 120 130 fps every game(8vs8 full room) and now with the new pc i have 60-90 fps in the same conditions and i don't really understand why. I run bf4 at full hd resolution and high graphics presets at over 60 fps,gta v,far cry 4 and all the newer games also at high graphics with decent fps and only crossfire seems to have some kind of issue.I'm thinking it's some kind of thing in the settings that it's not working well with crossfire's demands.Do you have any idea what's going on,any solution to this problem? Thanks.

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