Custom built PC. It has served me very well over the past 2 years. I played a lot of Battlefield 4 and this machine will easily run BF4 on 4K resolution at Ultimate graphics settings with over 60 fps. Battlefield 5 I had to set graphics settings a bit lower to display at 4K and keep up with 60+ fps. The extra wide case keeps everything extremely cool and is really easy to add parts or upgrade. Work and play it can do it all - compiles code on all 12 threads super fast and you can use the GPU for machine learning. I built this machine from individual parts purchased on Amazon and Newegg. If you buy this machine I will wipe all the drives and load a fresh copy of your favorite OS (Windows 10 or Ubuntu). Below is the full bill of materials in this machine. These are the actual links I purchase the parts from, not random links. Each part bought individually cost over $2700. CPU: Intel i7 7800X Cooling: Liquid cooling via Corsair Hydro Series H100i v2 Motherboard: ASUS TUF X299 MARK 1 RAM: G.Skill Ripjaw 32 GB (4x8 GB) Storage: 500 GB Samsung Evo (NVMe), 500 GB Intel 660p (NVMe), 4 TB WD Black (SATA) GPU: Nvidia GTX 1080 ti (Gigabyte brand) Case: Corsair Carbide Series 540