A few people have been concerned about how much it might cost to run Zwift, particularly if you're going to end up leaving the computer in the garage for ease of access. So I thought I'd document my setup to show you can run it on fairly old kit.
Core 2 Duo E8400This computer is over 8 years old and I was considering getting rid of it when I built my new one, but it's ended up in the garage to replace the laptop I used to take out there (which was fine for TrainerRoad and Perfpro but not enough for Zwift).
I've seen refurbished E8400 systems online for about £90; you could probably go cheaper in the local classifieds/Gumtree.
NVidia GTX460If you're going to spend money for Zwift, the graphics card is probably where to spend it. The graphics card I had in my machine (an AMD 4850) was surprisingly powerful for a card nearly a decade old; however it was just too old for the Zwift coders to support despite its power.
I eventually relented and replaced it with the NVidia GTX 460, a 6-year-old card which cost me £25 on eBay. It's quite capable of running Zwift smoothly at 720P HD - frankly if you can see higher resolution than that then you aren't pedalling hard enough. Zwiftalizer shows some benchmarks for different cards; you want to make sure you'll be 30 frames per second at least.
Donated MonitorFor a while I used a free donated monitor that was being thrown out; recently we upgraded our TV so I mounted the old one to the garage wall. TV resolutions aren't usually as high as computer ones but it's certainly good enough for Zwift at 1366x768, and it's properly immersive having a big screen in front of you.
TurboZwift supports a wide variety of turbos. Obviously the premier experience is with a 'Smart' turbo such as the Wahoo Kickr, but they aren't cheap. DCRainmaker reviews all sorts of turbos and is your best source of advice for the more expensive end. Alternatively you can use a power meter if you already have one, and any turbo or rollers you like - but that's also not cheap.
If you want to go cheap, try to use one of the few trainers supported by zPower (Zwift's virtual power algorithm with acceleration), or at least one where Zwift includes the power curve (listed as Virtual Power). My Cycleops Fluid 2 trainer (13 years old) is zPower supported and they currently run for about £100 second hand.
'Dumb' trainers interface with Zwift by means of a rear-wheel speed sensor. An ANT+ speed sensor will cost you about £20 - though for ease of use it may be worth springing for one of the Garmin hub ones that doesn't need a magnet (£30).
Other kitIf your sensors/turbo connects via Bluetooth you can use your mobile phone to transmit the information up to Zwift - though I find the app can sometimes get disconnected so I'd prefer something more reliable. Most people use an ANT+ stick - if you have a Garmin, or Adidas SpeedCell etc you may already have one - otherwise they cost about £10.
And lastly, theoretically optional, is the fan - though I warn you that Zwift can make you work very hard! There's usually a decent puddle under my bike after a race. I use a cheap (£15) pedestal fan from Argos but there are all sorts available - my garage isn't too hot in the winter; if you're training indoors then you might want something a bit more powerful.
Hopefully that's of some use - feel free to post other suggestions here or ask for more info!