I wanted to use my late 2012 imac for Zwift, and it was great in the morning when not busy. But now in the evening it crashes every 10 mins. I think it's because it's busy and the graphics card can't handle it. It has 512mb memory. Zwift say minimum is 1GB. Guess that means I need something cheap and fast that will do the job. I know literally nothing about PCs except that they're cheaper. I want something under 500 quid. So PC and screen in one sort of thing. Anyone know anything about this stuff?