[SOLVED] Why is one monitor 75hz and the other 60hz?

[IveFallenAndICantGetUp]

SPECS:
Ryzen 7 1700x
GTX 1080 FTW
16 GB RAM
2TB HDD
256GB SSD

Monitors: https://www.amazon.com/dp/B01JGYM5H6?tag=pcpapi-20&linkCode=ogi&th=1&psc=1

I have 2 monitors running from my computer. Both the exact same make, model and size. The only difference is that one is running into a DisplayPort to HDMI adapter and the other is running straight into HDMI on my GPU.

The monitor plugged straight into HDMI is running 75hz and the screen quality is much better. The monitor running to the adapter is running at 60hz and the quality isn't the best. Now, I would assume it could be a bad adapter, but that's unlikely in my case. I know it's not the monitor because I switched them and the other monitor went to 75hz, vice-versa.

What do you think the problem could be?

 

[Eximo]

Probably the adapter.

Depends entirely on HDMI and DP versions, cable bandwidth, adapter bandwidth, resolution, and frequency. 1080p 60hz

Needs to be HDMI 1.3 at least to go above 1080p 60hz.

 

[Glenwing]

Type 1 DP to HDMI passive adapters are limited to 165 MHz TMDS, which is maximum 60 Hz at 1080p.