TL,DR Version: Should I upgrade my cMP 4,1 or use the cash to start a Windows desktop that will allow me to upgrade and should receive software updates for longer than the cMP? If I upgrade, what should I upgrade next? Hey all, I purchased a (relatively) cheap Mac Pro 4,1 at the beginning of the year to replace a 2012 Mac Mini. While it's been a joy to use the cMP, I'm worried about the cost effectiveness of upgrading this machine since it's no longer supported by Apple. Since purchasing I've upgraded the firmware to 5,1 so that I could install Sierra, added an SSD and upgraded the RAM to 16GB. In total I've spent around £600-650 on the machine and the specs are: Quad Core 2.66GHz Xeon (W3520 I believe) 16GB Memory (It's running at 1033MHz but is 1666MHz) Sapphire AMD Radeon HD 7950 Bluetooth (2/2.1 I believe) and no WiFi With Apple no longer supporting the Mac Pro 4,1 with macOS updates going forward, this got me worried about how long they will support it with the 5,1 firmware. I wouldn't mind as much if there was a machine to upgrade to in the future, however all of Apple's machines are essentially non-upgradable. As with many other users, I wouldn't be as frustrated if Apple offered a machine similar to the cMP (upgradable) that I could move to in the future once this one becomes obsolete, however none of the current nMP, iMac or Mac Mini machine's really seem like realistic alternatives. Then again based on my last Mac ownership over the last 15 years I have owned five machines: G3 Power Macintosh, iMac G5, iMac Intel C2D, Mac Mini Intel i7 and now the Mac Pro 4,1. The longest I had a machine was the iMac G5 which I purchased in 2004 and upgraded in 2010 when I got a cheap Intel iMac. So I guess on average I own a machine for around 4 years? So do I continue to upgrade this machine with additional parts, or do I preempt the need to jump to Windows and use the money to start a Windows machine instead? While I have absolutely nothing against Windows 10, I use it on my Surface regularly, I've been a OS 9/OS X/macOS user for around 15 years now and feel much more productive with Apple's OS. I just hate the feeling that I could sink a few more hundred pounds into a machine that potentially won't be able to run next year's update to macOS. I was almost about to pull the trigger on a few upgrades, but they sure do add up: Intel Xeon W3690 Processor (£100-150) WiFi and Bluetooth 4.1 PCI card (£40) USB 3.0 PCI card (£45) 500GB SSD (~£120) That could potentially be a new processor and a chunk towards a motherboard for a Windows PC. I already have an old case and power supply so I'm partially there. Anyway, sorry about the rant, I'm just wondering on what people's thoughts are.