I just purchased the 750 GA about a month ago to replace my 650 G3 for the new 3080 cards. It was working fine with my 2070 windforce GPU. The problems started when I installed my 3080 FE and launched a game with the settings maxed out in 1440p. All of my temps were pretty high and the PSU was making a very loud whine under the gaming load which I thought was the 3080 at first. All of a sudden the computer shut down without warning and took a couple minutes to turn back on. After increasing fan speeds and cleaning filters everything still was hotter than normal. I noticed if I tried to alt tab out of the game my computer would instantly shutdown. Did some more troubleshooting and decided to reinstall my 650 G3 PSU and the shutdowns stopped, as well as my temps decreasing about 10°C across the board. I have heard other people having this issue and as of right now I wouldn't recommend picking up a GA for the 3080 until EVGA can solve the issue. You don't want to risk the PSU destroying any of your components. Unfortunately, I think the PSU burned out the LED in my AIO pump but I consider myself lucky that's all that happened.

I'm having issues with my 750 GA with a 3080FE as well, shutting down as soon as I open a 4k application.

rain2_usa
I just messaged Jacob on Twitter.  Hopefully he'll reply later in the day when they're open.  I know he was researching the issue as another person asked him the same question. 

thanks... It's a bit annoying since I bought the psu for the 3080 only ,and it doesnt work, totally random from EVGA, never had issues before with them

And here is the response that I just received ...
 
"The concerns you are referring to is within a very specific configuration. If paired a GA power supply with a 3080/90 FTW3 and a high wattage CPU such as a 10900K you may experience some power draw issues. Any configurations outside of this with a lesser power draw should not have any issues as this is caused by the various protections that were built into the power supply. Since the new generation of GPU and Intel CPU have a much higher power draw than previous generations it has caused some issues. Should you have any issues please let us know the specifics of the system specs so we can further assist."
 
So I should be in the clear and I hope this helps others out.  Thanks!

rain2_usa

nrmazloo
And here is the response that I just received ...
 
"The concerns you are referring to is within a very specific configuration. If paired a GA power supply with a 3080/90 FTW3 and a high wattage CPU such as a 10900K you may experience some power draw issues. Any configurations outside of this with a lesser power draw should not have any issues as this is caused by the various protections that were built into the power supply. Since the new generation of GPU and Intel CPU have a much higher power draw than previous generations it has caused some issues. Should you have any issues please let us know the specifics of the system specs so we can further assist."
 
So I should be in the clear and I hope this helps others out.  Thanks!

Thanks for following up.  I never got a reply from Jacob, but I guess it's going to be a wait and see kind of thing now.  Hopefully it'll be okay.  I'm sure we'll report back with problems and our configs if we come across that. 

No problem.  It's kind of a bummer in a sense because now I might have issues when upgrading components in the future even though the stated wattage of the PSU would more than cover the system.  Probably just a coincidence, but all the GA series are showing out of stock on the product page as of when I'm typing this out.  Good luck!  

I am also having this issue and I’m incredibly frustrated. I bought a brand new 850W GA about 2 weeks before my 3080 FTW Ultra to make sure I was all set. If I raise my power limits on X1 I start to experience crashes. Even with no OC, Raising power limit and trying to run an OC Scan causes my system to crash and reboot. This is on a 7700k, and there is no way this setup shouldn’t work. Now it seems to be a confirmed issue, and based on that response someone here got, there no plan or way to fix it?

rancel21342
I am also having this issue and I’m incredibly frustrated. I bought a brand new 850W GA about 2 weeks before my 3080 FTW Ultra to make sure I was all set. If I raise my power limits on X1 I start to experience crashes. Even with no OC, Raising power limit and trying to run an OC Scan causes my system to crash and reboot. This is on a 7700k, and there is no way this setup shouldn’t work. Now it seems to be a confirmed issue, and based on that response someone here got, there no plan or way to fix it?

Have you contacted EVGA support about this issue?  They will want to know your configuration but I'm assuming your setup is well within the "normal" limits of an 850 watt PSU.  It clearly isn't working so I hope they will help you out.
They should probably pull this line from their product page and wattage calculator until this gets sorted out.  Right now if you plug in a 10900K with a RTX 3090 it tells you the 750 GA is a good option.

I'm in the exact same boat. Just got my 3080 today and spent 3 hours trying to get it to post. I swapped where the 8 pins plug into the power supply and it worked...for 10 minutes. Once I was in windows and installed the drivers, i got a black screen. Had to wait a bit to get back into windows. Actually managed to try horizon zero dawn and as soon as I quit...blank screen. At this point I am just gonna go get a power supply locally. I'm done waiting.

Just wanted to add that I too just bought an EVGA Supernova GA 850W power supply for my latest build, expecting it would be fine with a 3080, only to find that it is clearly not.
 
PC Parts:

• EVGA Supernova GA 850W (of course)
• Gigabyte Aorus Z490 Ultra
• Intel 10700K CPU (overclocked +200 MHz all cores, max clock 5.3GHz, probably not helping power situation)
• Crucial Ballistix 3600MHz RAM, 2x16 GB
• EVGA 3080 FTW3 Ultra, stock clock

 
Other accessories being powered:

• NZXT X53 Kraken AIO, with 2 NZXT fans
• 6x Corsair ML120 case fans
• 2x SSDs (SATA)
• 3x NVMe disks

 
Fortunately for me, we are working on another computer for someone with a much less demanding setup, so my Supernova PSU will just get transferred as soon as my Corsair HX1200 replacement arrives (Sorry EVGA, I'll remain loyal to your graphics cards and your service for the foreseeable future, but this is not a good first impression of power supplies... I miss PC Power and Cooling, but I digress).
 
UPDATE 2020-11-06:  The Corsair HX1200 tests fine but is DOA when you try to power even a basic computer with it. Looking at recent reviews, this appears to be very common recently. I guess Corsair is off the list, too.
I put my 12-year-old PC Power and Cooling 850W PSU in here with the 10700K and the 3080 FTW Ultra and so far, no problems.
 
UPDATE 2020-11-10: So far the old PC Power & Cooling 850W unit is holding strong. Metro Exodus plays with RTX and other settings all on Ultra, DLSS *disabled*, at 100+ FPS without suddenly turning off. I am currently pretty happy with the setup.

I have same set up did that new power supply work?

captainunderpants410
I have same set up did that new power supply work?

In case you are asking me, so far my old PC Power & Cooling 850W power supply is holding strong. Updated my first post to reflect this. I'll be sure to update it again if I do ever run into another random power-off.

Are the issues mostly with the 850W GA? Are 3080FTWs working ok with G3s?

I too had the exact same issue....recently built a new computer with the new Ryzen 7 5800x (couldn't get my hands on the 5900x). I was originally using a RTX 2080, but the other day, I happen to be at Micro Center purchasing some fans and the graphics card Gods shined down on me and I walked out of there with a Asus ROG Strix RTX 3090 OC. After I first installed it, I kept experiencing random shut downs with no attempt to reboot. After the usual troubleshooting, I turned to the web to see if anyone else had a similiar issues. I saw a few post like this, so I decided to replace my EVGA 850w GA with a EVGA 850w G+ that I happen to have in my son's computer. No more shutdowns!!!!