I am looking to upgrade to a 1080ti and then eventually to the 11 series whenever those come out. What should I get in terms of a psu so I am at least future proofed for 11 series. I dont need to worry about a psu that will last forever, but at least works with 1080ti and 11 series. Thanks!

my current psu is 450w. Is that enough for 1080ti?
 
The EVGA page you linked seems to recommend a 650w psu. The outervision link said this:
 
Load Wattage: 353 W
Recommended UPS rating: 700 VA
Recommended PSU Wattage: 403 W
 
Which seems to suggest that my current 450w psu would work? If I could get by with my current psu and then upgrade only once I go to the 11 series that would be amazing. This is for VR gaming btw in case that changes anything. I play about 2-4 hours on a typical day.

Your PSU should probably be okay..EVGA does recommend a minimum of a 600W unit for a GTX 1080 Ti iCX GAMING (if that's the one you're talking about) though, but it's just a general recommendation..I'd go with something with more watts so that it's not running so close to the maximum power output and make more heat and noise..I'd grab at least a 500W or 550W unit which would be good without going overkill..But as it stands now, you shouldn't really have to get another PSU..Keep what you have now if you want to and see how it rolls.

The metal juice box that says 650w will do just fine and make sure it says gold or something cause that mean is good :)

I am a firm believer in not cheaping out on $1000's of PC parts by using a "MEH' power supply to deliver clean, dependable power to all the parts inside.
 
for your 1080xx card , I wouldn't go anything less than a 650 Gold....    but that's me.

My choice for GTX1080Ti...
 
https://www.evga.com/products/product.aspx?pn=220-G3-0750-X1
 
But for me I would bought 1000 T2 or minimum EVGA 850 P2.
Below 850 P2 I would not even think on high end PC with GTX1080Ti.
Because 850 P2 will not die even if you connect two of them.
Every scenario must be consider, maybe price of Radeon GPU drop and CF become very affordable, 850 P2 could hold two Vega 64 or two GTX1080Ti.
 
 
Because price is similar and size is almost same I would serious think between 850 P2 and 1000 PS.
In this situation I would use 850 P2 because I have cables for him and I will stay with future generations T2.
Cables are nice but in Europe significant investment and I will not pay 100 euro for cables for other models.
And guys who buy Sleeve Cables and PSU should consider some model for longer period. 5-7 years.
I will sell mine for 1-2 years and change for 1000 T2. First 5 years is best period of PSU.
But with these new models I don't expect to significant number of samples die before 11-12 years of usage.
There is still people who use CORSAIR TX from 2006-2007, these power supplies are far more advanced and better quality because in that time people didn't pay attention on PSU as last 5 years.
 
 
 

Even the 750 comes with "TEN YEAR WARRANTY PERIOD"
And Being in Stock on EVGA's Web Store you should get them Now.
EVGA SuperNOVA 750 G3, 80 Plus Gold 750W, Fully Modular, Eco Mode with New HDB Fan, 10 Year Warranty, Includes Power ON Self Tester, Compact 150mm Size, Power Supply 220-G3-0750-X1
Or
EVGA SuperNOVA 750 G2, 80+ GOLD 750W, Fully Modular, EVGA ECO Mode, 10 Year Warranty, Includes FREE Power On Self Tester Power Supply 220-G2-0750-XR

Requirements For the Lowest Level GTX 1080 Ti Graphics Card

Minimum of a 600 Watt power supply.

An available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector

Total Power Draw : 250 Watts 

evga g3 650 jejeje

i just bought a 750watt gold nova im excited!

650 Gold at minimum.  I could see the future cards requiring more power.

bitcode
650 Gold at minimum.  I could see the future cards requiring more power.

I agree, might be worth the investment now since power supply tech is least likely to change!

shhhpark
hey guys, 
i just purchased a used 1080ti sc2.  I have an 8700k cpu, is my seasonic 660watt platinum sufficient? Was thinking it's too close to the minimum specs

Have you Run the PSU tools in Post #2 yet ?

I would say a 660W Platinum should be good,...... depending on it's age and previous use.

I personally recommend going a bit overkill on a PSU as it’s a part that quality matters on. Normally if you fallow EVGA on Facebook or check the website normally on Wednesday they post some good deals. I think last week it was the G3 850W for only $79 with free shipping for example which would be overkill for most single GPU builds.