Anything about building you can get your answers here @ Bleeping. There are a few of us here that have been building for a very long time though I have not been here in these forums long. So far I have upgraded around 20'ish Dell XPS 8700-8900 and HP Envy series PC's with GPU/Power Supply/SSD's - and they are a good deal if you can catch them on sale and with coupons. The Dell XPS Machines are fairly nice they use either H series (XPS 8700) or B series (XPS 8900) motherboards and use a 460W power supply, which is a fairly high quality power supply and handles GTX 1060-1070-RX 470 cards just fine (GTX 1080-RX 480 are bit iffy best to add a quality 650W+ Unit). The HP Envy (or Omen) PC's can come with quality 500-550-600W units and handle about the same though the space is limited somewhat and everything is backwards/upside down with the BTX design they use. Dell also has a new XPS 8910 machine with a pull out PSU swing-arm mechanism and a custom CPU heatsink fan. Thus far I have not touched one of those. There are also pre-built OEM's that are gaming specific like Cyberpower, IBuypower, DigitalStorm etc. They use off the shelf type components like Asus, MSI, Gigabyte, ASRock, Corsair, Gskill, Patriot, Geil, etc. They can be an ok option as well but you have to be careful with the already-built-to-sell units and the power supplies because they tend to be very underpowered and lower quality so usually with those specific units you have to use the drop down selection menu to change the power supply to a better unit.
On the other hand building your own you get the exact components you want and the pride and know-how if building it yourself and managing any issues yourself. The overall cost can be more, or less than a pre-built with the same computing specifications it depends on your component selections and where you buy from.
Edited by Zone_86, 25 December 2016 - 05:59 PM.