benjaminbaker85 :
Your instinct is right. The HDMI cable can only support up to a certain resolution (1920x1080 I think) before the refresh rate starts to plummet, resulting in LOW fps (in the 20's when you get into 4K). The displayport can support that resolution and much more with a significantly higher refresh rate as long as the cable isn't too long (over 6 feet).
If the monitor only has HDMI input (no Displayport or DVI), then its max resolution and refresh rate can be provided by HDMI. No manufacturer is going to make a 144 Hz monitor and only put HDMI inputs on it (HDMI maxes out at 60 Hz).
HDMI 1.4 could only deliver 4k content at 24 Hz (actually 30 Hz). Any 4k monitor which can do 60 Hz will have a HDMI 2.0 input, which can do 4k @ 60 Hz. As long as you get a Displayport to HDMI adapter which supports HDMI 2.0, it will work with these monitors.
janner66 :
I have read about Display Ports and how they are better than HDMI but I couldn't find any information about DP to HDMI. I was wondering whether a display port to HDMI cable is worth buying. Is there any advantage using the display port from my graphics card to my HDMI monitor or will this just do the same as HDMI to HDMI. I suppose I/O is only as strong as the weakest link but I just wanted to clarify.
If your monitor only has HDMI input and the video card has HDMI output, just stick to HDMI-to-HDMI. Displayport-to-HDMI adapters mostly work, but can be a bit finicky because they need to power up to do the conversion. If your monitor auto-senses input ports, and the video card auto-senses output ports, this slight delay may cause it to not work. The monitor briefly powers up the DP port to sense if you have a monitor connected there. This powers up the DP-to-HDMI adapter briefly but not instantly. The monitor senses the HDMI input and switches to it, but the video card has already decided there isn't a monitor connected there, powered down the DP port, and moved on to trying the other output ports.
I've also seen cases where the video works, but the audio is not transmitted (both DP and HDMI support audio + video). Something about the conversion convinces the video card that this is a video-only DP connection (it thinks the monitor does not have speakers). KISS - keep it simple, stupid. If both the video card and monitor support HDMI, just stick with HDMI.
If you do go the DP-to-HDMI route, I'd suggest an adapter instead of a cable. While the cables are cleaner, the adapter lets you plug in any plain DP or HDMI cable (depending on if you get an adapter which sits at the DP source, or the HDMI target). So in the future if you should change desks and you discover a 2 meter cable is slightly short, you're not stuck having to buy a new DP-to-HDMI cable and throwing the old one into a box never to be used again. You can just use any generic DP or HDMI cable you have lying around which is 3m, and re-use the generic 2m cable for a different device and monitor.
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