This App Turns a Redundant iMac Into a Proper 5K Monitor for $49

Turn your redundant old iMac into a proper 5K monitor for your newer Mac. This setup delivers full resolution and smooth 60fps performance.

I reviewed RetinaRelay back in May, and while the original version was clever, it was capped at 28 fps. Version 2 is a complete rebuild that turns an old 5K iMac into a second screen for your newer Mac, supporting the native 5120 x 2880 resolution over a single Thunderbolt cable. It is a massive improvement for anyone with older hardware gathering dust.

This is one of those essential macOS utilities that actually solves a real-world problem without unnecessary complexity. I walk through how it works, the benchmarks, and why this is the best way to reclaim your desk space.

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Download: https://www.retinarelay.com/

Chapters
00:00 – Start
04:14 – How Does It Work?
05:55 – The Benchmarks
09:49 – Conclusion
11:57 – Outro