How much PSU headroom is safe??

[infamousk12]

I'm buying parts for my build, and I'm planning on getting an ultra wide curved display (probs the Rog Swift pg34).

Currently, my build is a single GPU(gtx 1080) and Z170 platform. I've been looking at benchmarks, and for ultrawide, the numbers seem ok, but I'm not entirely sure. If I go SLI, I know I would be safe in terms of fps and performance, but then it brings the question of, then I need to upgrade to X99/6800K and so on. I can probably budget this, but then, would 860 watts for a psu work? I ran a psu calculator and it said with that set up it comes to around 690. Is there enough headroom in my Corsair AX860i if I do change gears and go for an SLI setup??

Thanks!
CPU: Intel Core i7-6700K 4.0GHz Quad-Core Processor ($344.99 @ SuperBiiz)
CPU Cooler: Corsair H110i GTX 104.7 CFM Liquid CPU Cooler (Purchased For $130.00)
Motherboard: Asus MAXIMUS VIII FORMULA ATX LGA1151 Motherboard ($347.99 @ SuperBiiz)
Memory: Corsair Dominator Platinum 16GB (2 x 8GB) DDR4-3200 Memory ($139.81 @ Amazon)
Storage: Samsung 850 Pro Series 512GB 2.5" Solid State Drive ($219.60 @ OutletPC)
Storage: Western Digital BLACK SERIES 1TB 3.5" 7200RPM Internal Hard Drive (Purchased For $69.99)
Video Card: EVGA GeForce GTX 1080 8GB FTW Gaming ACX 3.0 Video Card ($670.00)
Case: Corsair 780T ATX Full Tower Case (Purchased For $170.00)
Power Supply: Corsair 860W 80+ Platinum Certified Fully-Modular ATX Power Supply (Purchased For $204.00)
Operating System: Microsoft Windows 10 Home OEM 64-bit ($83.89 @ OutletPC)
Keyboard: Corsair Vengeance K70 Wired Gaming Keyboard (Purchased For $159.99)
Other: Mouse Pad (Purchased For $30.00)
Total: $2570.26

 

[Eximo]

That is a reasonable amount of headroom for a stock system. And a platinum supply is quite efficient, so it won't get as warm providing nearly its entire output.

I would personally want a little more headroom if there was any overclocking planned.

 

[Vic 40]

Power Supply: Corsair 860W 80+ Platinum Certified Fully-Modular ATX Power Supply (Purchased For $204.00)

This is more than enough for sli of the gtx 1080 and overclocking.

 

[Wildthorn]

Below 50 headroom is not good. This setup is fine and I'm pretty sure you can overclock to some extent with an 860W corsair. I would say this is fine

 

[Vic 40]

One month old so probably solved already....

And do you want to draw attention? Things like that colored answer are really only accepted when from mods,well from what i know.