You can make a difference in the Apple Support Community!
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.
I have a Mac Pro 5,1 with the HD 5770 card. Using an Amazon sourced Rankie Mini DisplayPort (Mini DP) to HDMI Cable, my AOC U2790VQ 4k monitor only renders 1080p resolution. Will an Active Mini DP to HDMI adapter allow me to render higher resolutions or is something else needed? Additionally, the Mac sees it as a U2790B Display, instead of the correct 4k model, but AOC doesn't have Mac drivers, they claim its plug and play.
Grant, just an FYI the active adapter did fix my issue. See attachment. I used a 'Cable Matters Active Mini DisplayPort to 4k-HDMI Adapter' (Model 101021) and the HDMI cable that came with the monitor. For some reason the 2560 res shows 'low resolution' but it performs flawlessly. The 4k does run at 30 Hz, but this has been previously documented with the HD5770 card.
Grant, just an FYI the active adapter did fix my issue. See attachment. I used a 'Cable Matters Active Mini DisplayPort to 4k-HDMI Adapter' (Model 101021) and the HDMI cable that came with the monitor. For some reason the 2560 res shows 'low resolution' but it performs flawlessly. The 4k does run at 30 Hz, but this has been previously documented with the HD5770 card.
No. Active adapter will not change that at all.
If your display cannot use something inside the range of 2560 by 1600, you may be stuck with 1920 by 1080p.
Be sure you are interpreting the numbers correctly, by looking at:
menu >about This Mac > (system report) Graphics & displays ...
Note carefully that there are TWO lines about Resolution The top one is U resolution, the lower one is "User Interface Looks Like" which describes font scaling effects added.
--------
also, in the System Preferences > Displays ...
hold down the Option key while you click on the resolution box to get more choices, possibly including "less natural" sizes.
Back up and going. Note that this is plugged into my 2560 x 1440 monitor, and it shows up as the same 1080p max res. This is using the same cable. That monitor shows a full range of resolutions on a windows 7 machine.
When I plug the 4k back in and do the same thing, the Mac still thinks its the U2790B 2560x1440 monitor and not the new U2790VQ 4k one. Assuming the card is functioning properly, it almost has to be a cable issue.
Hi, atlasgeo, maybe I can help you. Yes, you're correct, there are no Mac drivers for that monitor. However, the HDMI version does make a difference. There are two HDMI sockets/ports on the monitor, a 1.4 and a 2.0...... 1.4 supports up to 1080 and 2.0 does 4k. So, maybe make sure it's plugged into the correct socket/port which should be labelled, and yes, I know, getting in there and unplugging and re-plugging in the cable is a pain in the butt, but they're all kinda like that. Luckily you only have to do it a few times (whew !). You should also only unplug and re-plug your monitor cable when both your Mac Pro and your monitor are turned off. the Rankie cable says it supports 4k and audio up to 7 channels, so I'm guessing it's HDMI 2.0. After you have connected the HDMI end to the proper socket on the monitor, check under system preferences then displays. If you hold down the option key while clicking around, detect displays should come up, and you should be able to choose scaled resolutions instead of just "best for display". Anyways, atlasgeo, give all that stuff a try. You also might want to reset smc/pmu and zap pram on startup as well. Couldn't hurt...
Ohhh.....I just got it..you have an HD 5770 video/graphics card. the max resolution of that card is about 2k and it supports HDMI 1.3 and DisplayPort, plus Dual Link DVI. Yes, you will need an active MiniDP to HDMI adapter for that. Kanex is the recommended brand, I believe.....
well, that's all I have on that
john b
I've already held down the option key, it gave more scaled options but none higher than 1080p. That machine is actually offline for some reason right now so I can't remote in. Will have to follow up later.
If you have any aspirations of moving up to macOS Mojave, you could install a metal-capable card and get higher resolutions. Many are available flashed for Mac boot-up screens and can be run on the power already available inside your Mac Pro. Some may require a simple "stunt cable".
At this writing, used cards claiming boot screens and Metal capability for Mojave with AMD R9 280x and a few 7950 - 7970 family are available on US eBay for under US300. They will also work in High Sierra.
Many NVIDIA cards are problematic because appropriate Drivers are not available.
I'd considered that but I was trying to avoid upgrading the card. The 5770 should work with the 2560x1440 monitor. I'm trying a different cable arrangement.
Noted on the AMD R9 cards, that would be nice.
Great that you have it going!
I don't think the ACTIVE-ness of the adapter fixed the issues, I think you bought a more capable adapter that is also ACTIVE.
It knows the display is at Low resolution and can do much more because the Mac sends a query at certain times, and the display must answer with its name and capabilities. (that is how that window can be named with the name of the display -- U2790B -- even through you never typed the display-name in anywhere).
I've tried it, see pic. For whatever reason the Mac is only seeing a 1080p monitor. I'm assuming if I purchase it I can go to a custom res, but I assume it would be blurred by scaling up.
Maximum resolution of the 5770 is 2560 by 1600 (the resolution of the Apple 30-in Cinema display) on each of DVI-I and two mini DisplayPorts. It requires one aux cable.
Grant, I'm aware of that but I can't even get the 2560 x 1600, only 1080p. Will an active adapter fix this?
Mac Pro 5,1 Mini DP to HDMI only gives 1080p
