This is my first PC build and I knew that for CAD work I needed to get the highest clock speed CPU that I could for a reasonable price. The i5-8600K has been perfect for my needs and handles everything I throw at it very well.
CPU: i5-8600K overclocked to 5 GHz at 1.328v.
GPU: RX 570 8GB overclocked to 1400 MHz core and 2135 MHz VRAM at 1.11v.
Motherboard: MSI Z370-A Pro ATX. All I can say is it was the cheapest Z370 board at the time at $90. The VRM gets a little warm during full synthetic load (80C) so I just put a couple of small fans pointed at the heatsinks which keeps temps lower than 70C during full synthetic load.
Storage: Samsung 970 EVO 500 GB M.2. Just the best performance out there for a reasonable price.
CPU Cooler: Cooler Master Hyper 212 EVO. Just best cheap CPU cooler out there that I can upgrade in the future without having to worry about wasting money.
RAM : Corsair Vengeance LPX 16 GB DDR4-2666. I bought the ram for $120 back when ram was expensive and it was even on sale for black friday. I managed a 3000 MHz overclock with little fuss but couldn't push it further without getting memory errors.
PSU: EVGA 500W 80+. This was literally the cheapest 80+ anything 500W at the time of purchase. I wouldn't spend more that $20, which is what I paid, on a power supply such as this. If you are going to spend $40+ then at least get 80+ bronze.
The processor and gpu combination crush in solidworks with real-view manually enabled. Streaming while gaming is easy thanks to the iGPU (Intel HD 630) carrying the video encoding workload.
My specific i5-8600K wasn't the coolest chip on the block so it runs close to 90C during full synthetic load (prime95) at 145 watts when being cooled by the hyper 212 evo (which is rated at 145 watt TDP).
There are probably nicer looking cases for the money but I got mine on black friday 2018 for $20, as well as the rest of the parts, so I can't really complain.
Temps in the details list are at full synthetic load. Gaming and workstation use will be far lower and usually average around 65C for the CPU and GPU at my custom low noise fan curves.