AMD r9 280 tearing

[rampageloco]

Hello friends.
My english is very bad and I'm tired, sorry for that, here is my problem:
cpu: i5 4690k 3,5GHz
gpu: amd r9 280
ram: 8gb
motherboard: asus z97-p
supply: tacen mars gaming 800 W

I got tearing on youtube videos and metal gear phantom pain.
So I decided to test the GPU and Ram in another PC and they worked well.
(Before that I activated V-Sync on the catalyst control center, also in the videogame)
I tried installing older version for drivers.
I tried using another GPU in my motherboard with the same supply and I had tearing too; after that the company where I bought all the new hardware changed me the motherboard, the same model and what happened?? I had tearing too.

*edited: with the first motherboard (the same model) I used integrated GPU and I saw the videos on youtube better than the R9 280

So my question is the next: Is the problem in the Supply? Or in the motherboard again?

Sorry for the spelling mistakes and thank you very much.

 

[rampageloco]

no one can help me please? I've got 2 days for the RMA

 

[SinxarKnights]

The only thing I can think of is to make sure everything is default in the control center. Other than that it sounds like a monitor issue if you tried a different GPU and it still does the same thing.

How is your monitor connected to the PC?

 

[rampageloco]

The only thing I can think of is to make sure everything is default in the control center. Other than that it sounds like a monitor issue if you tried a different GPU and it still does the same thing.

How is your monitor connected to the PC?

by DVI but I tried with my brother's monitor (HDMI) and still having :S
When I used the other monitor Should have I done something else?