This is apparently expected design from 2012 and newer iMacs. I had only found out after taking the iMac apart that this system throttles itself heavily if no Display is attached. Overall this machine was extremely difficult to work with initially. 5k iMac Experienceįinally, we have our first non-DisplayPort 1.4 candidate. So no actual colour work was planned regardless. However, for the majority of the time, I planned to play games in Windows on this system. At least to my untrained eye, regular usage with the panel was quite well. However upon first usage, I didn’t even noticed until I pulled out some 10Bit reference images. With the RX470, I knew that I would be lacking 10 bit colour support. Otherwise, this panel’s been functioning great with the system. Switching to the generic Display profile used by iMacs resolved the issue ( Display P3 is right below it). The system worked out of the box, however, colour profile in macOS was a bit wonky with the default DP 5K3K profile. Once the unit arrived, I had the following systems planned to use with: Systemįor the 14” MacBook Pro, I had zero issues achieving 5k at 10Bit Colour. The unit that arrived was the R1811 V4, and I had decided to skip purchasing the Current Board for this setup. For simplicity’s sake, I decided to spend the extra dollar and get myself the R1811 Driver Board. Older panels may benefit from this additional current if you’re having brightness issues.Īs mentioned earlier, my unit was a 2014 5k iMac which includes the LM270QQ1-SDA2 panel. However, for panels supporting DCI P3 Colour, you’ll need an additional Constant Current Board to achieve proper brightness on the panels. LM270QQ1 is used by Apple while LM270QQ2 is used by LG in the Ultrafine series: Variantįor the SDA2 and SDB1 panels, usage with the driver boards is plug-n-play. Display Panelsįor the years that the 5k iMac has been around, Apple’s used many panel revisions within the units. With regards to hardware support, see the R1811 section. This board is also a single cable solution so an ideal candidate for a little/no-fuss setup for machines. The main difference is simply the lack of DSC and thus maxing out at 5k 8bit colour. U49 - DisplayPort 1.4įinally, the U49 is one of the newest boards I’ve found and is mainly a cheaper version of the R1811. Thunderbolt 1 controllers max out at DisplayPort 1.1. However similar to the 2018 Thunderbolt situation, DisplayPort 1.2 is only available on Thunderbolt 2-based Macs. The following GPUs support DisplayPort 1.2: Vendor
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