youtube videos very pixelated

Oct 26, 2018
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i've upgraded my monitor to 1080p 144hz benq xl2411p and since then youtube videos look very pixelated https://pasteboard.co/HKeA325.jpg

Recently upgraded gpu from amd hd 6670 to nvidia gtx 1070ti and psu 750W aswell and the problem persists.

I don't think it's the monitor because the pixels show up in the image print screen, i don't think it's the gpus, so could it be the dual port cable or the cpu (i5 4690k) or ram (8GB total, 2x4GB 1600hz + 1x4GB 1600hz)?