Radeon RX 580 won't go higher then 1080p on HDMI

[toshibitsu]

I am using a 4K monitor & have a 580 4GB video card installed on my system. When I use the DisplayPort cable, it runs at 3840x2160 resolution just fine. I am now using the DisplayPort connection on my Macbook... so decided to switch over to HDMI for my PC. I had an old HDMI cable laying around here & when I used it the resolution was at 1920x1080(it would not let me go any higher). I figured the HDMI cable did not support 4K so I went out and bought a new one that does support 4K.
With this new HDMI "4K" cable, it still does not go higher then 1920x1080. I switched back to DisplayPort(temporarily) just to make sure, and it still goes to 3840x2160 with that cable just fine. I ended up re-installing the display driver w/ the latest from AMD's website. I also went to 'Display Adapter Properties - List All Modes'... still does not go higher then 1080p.

Does anyone know what the problem is? Thank you

 

[BFG-9000]

The TV also must support HDMI 2.0, not just the card. If it only supports v1.4 then 1080p will be the limit on that input.

 

[butttface]

What is the transmission bandwidth of this cable? You need at least 12.5 Gbps to support 4K @ 60Hz
AFAIK these cards have HDMI 2.0, which is the lowest HDMI version that supports 4K at 60Hz. Verify that the HDMI port(s) is v2.0 or higher.

 

[toshibitsu]

The cable is an Insignia 4' HDMI 4K Ultra HD (18Gbps bandwidth , 4K Ultra resolution , 4K/60FPS support)

and again... the monitor does 3840x2160 via DisplayPort , but maxes out(so far) at 1920x1080 on HDMI

🙁

 

[BFG-9000]

And again, many 4k displays do not support HDMI 2.0. Expecting it to work if if doesn't have it is like wondering why gigabit doesn't work on your laptop with a 10/100 port despite having both gigabit ports on your router and a certified Cat6a cable. Or why your Yugo can't hit 186MPH when it has Y-rated tires on it certified to do just that.

Most 1440p monitors this past decade can't do over 1080p on HDMI and require dual-link DVI or displayport to run at full resolution. They still have HDMI ports to attach a Blu-Ray player or cable box nevertheless.

HDMI is equivalent to single-link DVI which doesn't work over 1080p either. They raised the TMDS Clock to 600MHz in 2.0 to overcome this, and the card cannot negotiate a 600MHz link with a 340MHz monitor port. What monitor do you have?

 

[toshibitsu]

And again, many 4k displays do not support HDMI 2.0. Expecting it to work if if doesn't have it is like wondering why gigabit doesn't work on your laptop with a 10/100 port despite having both gigabit ports on your router and a certified Cat6a cable. Or why your Yugo can't hit 186MPH when it has Y-rated tires on it certified to do just that.

Most 1440p monitors this past decade can't do over 1080p on HDMI and require dual-link DVI or displayport to run at full resolution. They still have HDMI ports to attach a Blu-Ray player or cable box nevertheless.

HDMI is equivalent to single-link DVI which doesn't work over 1080p either. They raised the TMDS Clock to 600MHz in 2.0 to overcome this, and the card cannot negotiate a 600MHz link with a 340MHz monitor port. What monitor do you have?

I won't be home for awhile otherwise I'd go check. What you're saying makes sense though and that must be what the issue is. At least now I know there's nothing wrong with the hardware(and I have an extra HDMI cable now).

Thank you