X99 is to run a SLI/CrossFire configuration to get the extra PCIe lanes, for the best (and expensive $$) performance.
X99 is useless for a single video card configuration.
1200w ??? http://www.realhardtechx.com/index_archivos/Page362.htm
https://outervision.com/b/nebq0X
Are you sure you need/want to spend (lose your money) a 1800x?
For DCS, an i7 and an i5 are the same (the "K" version at the same speed). For DCS the i7 (the K) don't worth the extra cost.
Your system (i7 4790) run DCS at 4Ghz.
Again
Try to find an i5 4670K, i5 4690K. And overclock him.
Because DCS has migrated to Dx11, you need more video ram (6G). No need of a Hyper-Threading CPU, get an i5 7600K, a CPU cooler, Z270 and RAM, and a lottery ticket. What is your resolution?
A GTX 1060 6G for 1080 lines, a GTX 1070 for more.
Pay more, the unit will last longer. :smartass:
https://www.thetechgame.com/Archives/t=5613293/power-supply-guide-the-good-and-the-bad.html
http://whirlpool.net.au/wiki/psu_manufacturers
Maybe because few minutes is not enough to discharge the C4, C5 capacitors. The RT3 resistor limit the inrush current (it has a negative temperature coefficient).
PSU has many safety approvals, like the CSA. Please don't turn off the PSU switch.
What is your PSU? How old he is?
=EDIT=
This is a "pop".
This is a click (relay).