Currently have an EVGA G3 850W.  If buying new now though I'd step up to the 1000W Super Flower Leadex V Gold.  The G3 is a rebranded Super Flower PSU, unfortunately EVGA moved away from them for more recent PSUs like the G5.  With the ever increasing power demands - 4000 series rumored to actually require even more power - getting a weak PSU seems like a total waste.

neteng101
Currently have an EVGA G3 850W.  If buying new now though I'd step up to the 1000W Super Flower Leadex V Gold.  The G3 is a rebranded Super Flower PSU, unfortunately EVGA moved away from them for more recent PSUs like the G5.  With the ever increasing power demands - 4000 series rumored to actually require even more power - getting a weak PSU seems like a total waste.

But 12VO may or may not happen relatively soon. I don't want to be stuck with a bunch of high end ATX PSUs when all the new hardware is using ATX12VO. 

I'm using a 650W PSU, but that's because the PSU is dedicated entirely to the GPU.

This is a sweet PSU and will let you play with an OC,  The new series EVGA are solid smaller and more efficient
https://www.evga.com/prod...tecode=8KEPU0FP7JKVFS5

Hopefully 750W will be enough for 70ti

850w corsair 
 
runs great

I'm using the T2 1000w. Super happy with it.

You should go with something that has headroom and will last a long time.

I am using an EVGA T2 1000 watt psi.

Works amazing.

Small tip, with my 3080ti ftw3 I was finding that my ups was not up to the task with my monitors and other accessories also attached.
I ended up needing a ups dedicated to the PC by itself to avoid warnings about power draw when I would start gaming.

Might not happen to everyone obviously but think about a UPS that can keep a 3080ti PC up for longer than 1 minute. Moot point if you don’t use a UPS.

hksiew
Seasonic 1300W Prime Gold. Overkill probably, but will be good for the next upgrade or two in the next 4/8 years. 
It comes with a 12 year warranty.

Yes that should last you a while unless there is a PSU spec change. 

hksiew
Seasonic 1300W Prime Gold. Overkill probably, but will be good for the next upgrade or two in the next 4/8 years.
It comes with a 12 year warranty.

Please report back if it goes into protect, like mine did.

Corsair 750RM with my 3080ti for a while now and haven't had a single issue.  

Got the EVGA SuperNOVA 850 P2 on sale about three years ago for like $100 bucks. I really like it and have no issues running a 3080ti and R9 5900X. I also used the same PSU to run a 3090 and an i9 9900KF overclocked to the thermal limit of my cooler. I'm really pleased with it.

I run fine on a Corsair SF750, my system (5600X and 3080ti XC3) is not even close to 750W. You can watch plenty of tech reviewers who ran 3080s just fine on a 650W even. It comes down to more than just the 3080ti.
1) What CPU are you running? If you have a highly power inefficient and overclocked Intel chip, it can demand over 200W. If you are running an AMD 5600X stock, less than 100W.
2) What GPU specifically. The 3080ti XC3 for example maxes out around 350-360W. While the FTW3 can potentially hit 450W+.
3) How good or crappy the PSU is.
4) How much other stuff are you plugging in ? Memory and NVME are really minimal usage overall. But are you running a huge array of hard drives? Other PCI cards?
 
So if you are planning to overclock a high end CPU and overclock a high end GPU, 650W would not be enough and even 750W, esp. if you have a lower quality power supply would be pushing your luck.
But then if you plan to run a lower end 3080ti stock along with a lower power CPU stock, even 650W (good quality) could potentially work. I'd get a 750W at least myself, though. Probably 850W if I was really pushing the overclock on power hungry CPU/GPU combo.
 
Search around youtube for some information on how much PSU you actually need. Articles like this give lots of info and debunk overspending for grossly oversized PSUs: 
Wasting Money on Power Supplies: How Many Watts You Need for a PC PSU (2020) www.youtube.com/watch?v=X_wtoCBahhM

Corsair too

kevinc313

hksiew
Seasonic 1300W Prime Gold. Overkill probably, but will be good for the next upgrade or two in the next 4/8 years.
It comes with a 12 year warranty.

Please report back if it goes into protect, like mine did.

I have no issues with it. By going into protect, do you mean like random shutdowns , games crashing ?
If so, i have no such issues.