I wish you good luck with your Journey, about half a year ago i did the same. But lately it isn't profitable enough because electicity is way too expensive.
But you should've done some research which would save you some grands.
For these 5k you should've bought either rx580/570 or a 1070/1080TI.
Depending on what you want to mine.
The Vegas aren't that good in Efficiency.
Also 8 GB Ram are overkill.
If you want to be really efficient, buy a Server Powersupply and use it for the GPU's and connect it with a normal Powersupply for the Mainboard.
This will save you a lot on electricity and money on Powersupplys, because Server Powersupplys are way cheaper and more efficient.
Update : I tried to run the rigs for a longtime but every time it gets failed either due to overclocking or could not fix technical errors ,I'm not a techie but those who invest in such hardware think twice before invest ,i end up losing $5k.