weird FPS problem

[BlinxBear]

Sup everyone. I am have 2 diffrent GPUs in my system, one R9 270X and a older AMD 5450 so I can run 3 screens. I would hook 2 screens up to the old one and then my main monitor that I game on to my 270X. Then one day started to get really bad FPS in all games so I checked MSI after burner and for some reason the 5450 i pinned at 100% but the 270X is just chilling at 30%. So I took out the 5450 to check if it fixed it and low and be hold it did the trick. But now I only have 2 monitors running and I need my 3rd sceen man #FirstWorldProblems.
(BTW if you didnt know, the 270X doesn't support 3 screens unless you have a active DP adapter)

 

So I am wondering if anyone else have had this happen to them in a similar a situation and if anyone have a seluton to this problem except getting a active DP adapter.

Thanks for all answers in advance ;D

[Majestic]

The only way that can happen, is that the primary screen was set to the HD5450.