We had a customer recently who had a gaming PC and he wanted to change one or two parts. in the end, it got a bit more involved than just a couple of parts to replace.
The old PC had a good specification, but had developed a motherboard fault, so it was decided to do a complete rebuild. the customer was able to upgrade other components at the same time (faster CPU, better Ram, etc.)
We stripped down the old PC so we just had a case, and waited for the new parts to arrive. While waiting, the case was cleaned and all dust was blown out, cooling fans were checked, and on this particular case, a small repair was needed which we did).
We fitted an Asus Prime Z270-K motherboard and an Intel i7-7700K CPU
together with 32Gb of HyperX Fury DDR4 Ram, the sound card was a Soundblaster SBX Prostudio and the graphics card was Gigabyte GeForce GTX 1080 Founders Edition 8G.
The customer already had a 500Gb Kingston HyperX SSD and a 4Tb Seagate Desktop HDD and these were re-formatted and re-used, a LG Blu-ray (BD-Rom/DVD Re-writer) drive was also refitted from the original PC setup.
As the PC was to be used for high end gaming, a Corsair H100i V2, liquid cooling system was fitted.