Hello all! I currently have a 2012 rMBP that I used for development. I would like to replace it with a desktop Mac that can drive a 4K display at 60 Hz. The Mac mini and iMac are non-starters for obvious reasons. I’m considering a used 4,1 or a 5,1. Requirements: quiet (the drive bays will be empty) the CPU is not slower than a 2012 2.3 GHz rMBP 16 GB of RAM (which could eventually be upgraded to 32 GB) can drive a 4K display (Dell P2715Q) supports Metal supports Continuity/Handoff/AirDrop/SMS/phone relay/whatever supports FileVault (this is why a Hackintosh is a nonstarter) lasts 2-3 years (optional) supports an internal Bluray drive as an eventual upgrade Here’s the upgrades I’d do with ballpark prices: $225 - R9 280X $275 - PCIe SSD (~250GB) $100 - wireless card from OSXWiFi $50 - USB 3 card = ~$650 total for upgrades What would be a decent base configuration to use? Would a single-socket 4,1 be sufficient, and roughly equivalent to my existing rMBP? What can I reasonably get for <$1000 (before upgrades)? OWC has a few machines around this price point, but I assume that’s more expensive than buying a machine from eBay. Regarding the GPU: the R9 280X is fast enough, but does anyone recommend a different card? Can I flash it myself (I have access to a PC)? Will it require a second PSU or modifying the case or existing PSU? Is around $275 reasonable for a ~250GB PCIe SSD? Does anyone have any recommendations? (The alternative is to wait for the 7,1. It would be small, quiet, fast, and last me a long time, but it would also be more of an investment.) Any other thoughts? Thanks!