Monitors For The 2015 Retina Macbook Pro
Buying an external monitor for the retina Macbook Pro can be cumbersome. It's not as easy as going to your local electronics store and picking out a random monitor, but you need to make sure the monitor can support the resolution of the device. I found this out the hard way. Once I brought home the retina Macbook Pro, I connected it to a 27" AOC IPS LED HD Monitor (I2757FH) with an HDMI. At first, it looked great, but then I opened up the browser and noticed the fonts looking a little blurry. Disappointed, I went online and searched the forums and realized the maximum resolution of the monitor was 1920x1080, while the Macbook was 2880x1800 causing the fonts and icons to be off.
I couldn't find many monitors that would match the resolution of the Macbook, except 4k monitors, which are expen$ive! I bit the bullet and bought a 27" LG 4K Monitor (LG 27UD68) and connected it via HDMI. This fixed the font and color issues, but I noticed that there was a lag in the mouse. It was slight, but definitely noticeably enough to bug me, especially considering the cost of the monitor and Macbook! It turns out that the HDMI output on the Macbook is not HDMI 2.0, meaning the maximum refresh rate is 30Hz. For smooth crusin', you'll need 60Hz.
Luckily, just as I was about to post the Macbook on Craigslist and run back to Windows, I found out a refresh rate of 60Hz was achievable through the DisplayPort!
So if you're looking for an optimal external monitor, make sure it's at least 2880x1800 and that it's connected via DisplayPort.