I wonder how Apple gets away with its under powered machines. Is it marketing or something else? This custom PC uses following components: Intel i7-5820K CPU

I wonder how Apple gets away with its under powered machines. Is it marketing or something else? This custom PC uses following components: Intel i7-5820K CPU – http://amzn.to/21TmH82 http://amzn.to/21TmH82 Corsair H115i CPU Cooler – http://amzn.to/1p95eKU http://amzn.to/1p95eKU ASRock X99e-ITX Motherboard – http://amzn.to/21TmTE9 http://amzn.to/21TmTE9 Corsair Vengeance 32GB (2x16GB) DDR4 RAM – http://amzn.to/21Tn16S http://amzn.to/21Tn16S Crucial MX200 500GB SSD – http://amzn.to/21Tn7LB http://amzn.to/21Tn7LB Samsung 950 Pro M.2 NVMe SSD – http://amzn.to/1pt0FLx http://amzn.to/1pt0FLx EVGA GTX 980 Ti Hybrid Graphics Card – http://amzn.to/1pt0JL8 http://amzn.to/1pt0JL8 EVGA P2 750W Power Supply – http://amzn.to/1p95Dgp http://amzn.to/1p95Dgp Fractal Design Nano S mini-ITX Case – http://snazzy.fm/PT7F3 http://snazzy.fm/PT7F3