I wouldn't if you plan to overclock at all.
If stock then you should be fine

you are 100% totally fine.   I have similar rig and have a 3090. and when I run the power test in the new version of Precision X1 it says only 702W are max draw and EVGA recommends a 750 Gold or better.  so with a 3080 you are totally fine with a quality 750, and that's even with overclocking.
 
go ahead and grab PX1 1.1.0.11 and there's a new feature at the top with icon POWER.  run that to confirm

kring
you are 100% totally fine.   I have similar rig and have a 3090. and when I run the power test in the new version of Precision X1 it says only 702W are max draw and EVGA recommends a 750 Gold or better.  so with a 3080 you are totally fine with a quality 750, and that's even with overclocking.
 
go ahead and grab PX1 1.1.0.11 and there's a new feature at the top with icon POWER.  run that to confirm. 

Awesome! glad to hear I will give it a try when I get my hands on an FTW3 3080. Still waiting. 
EDIT You meant grab PX1 update now? Oh okay. Going to see if the method below with HWinfo works if the other user can explain where I can find the info on the program.

ehabash1
can you download gpuz and or HWinfo and check some of your power draw?
the 9700k is pretty power hungry but stock doesnt pull THAT much. Since there are so many variables like are you watercooling at all? pump needs power. Lots of fans or only a couple?
 
You should probably be fine but if i were you i wouldnt try messing around with 450watt XOC bios for the 3080. stock bios even if you overclock the gpu i think you will be fine but you should check your current power draw to make sure

I am pretty noobish but I use HWmonitor I downloaded HWinfo to post the results but I can't find anywhere on HWinfo I never used it before sorry. And no worries I wouldn't mess with the 450watt OXC bios unless I upgraded my PSU next summer. Can you help me find the info on HWinfo please?

dominic2189

EpicSurvivor
So I plan on getting an FTW3 RTX 3080 and wanted to get some input. I have an EVGA SuperNova 750 G2 PSU was wondering if that would be enough or if I would have any issues? The rest of the specs are 9700k (Stock) 16GB RAM, One 2TB HDD and One 1TB SSD. Motherboard AORUS PRO Z390.
 
EDIT: I need to update the signature.
Thanks
 

As long as you don't use the 450W BIOS OC, that's fine. They recommended 850W if you updated the BIOS to the 450W, anything else is fine with a 750w.

Okay thank you! hope I can get my hands on an FTW3 3080 soon.

Robob
I have overclocked CPU and GPU together on 750w with 3090 and I’m running good so far.
I don’t run optical drives anymore but just have 3 ssd and fans.
As others stated as long as you don’t load the extreme O/C 450w bios you should be good.

Awesome! perfect. that's what I like to hear. Appreciate the help!

mchang1984
The best time to buy a PSU would be Black Friday though.
 
I bought an EVGA 1600W T2 last year for $150 from EVGA during black friday. Best Deal ever.
 
750W is probably OK, but you can never go wrong with better efficiency with a higher PSU.

I was thinking about that. Black Friday is just a month away. Will see what happens. 

Also just remember that PSU ratings don't mean that the computer will always pull the max rating. That is just the maximum power draw the PSU can provide.
 
Peak efficiency occurs when a PSU is at 50% of the maximum load / capacity
 
So for example a 750W PSU is NOT going to pull 750 Watts from the wall 24/7. On a computer it will pull the total sum of all the watts needed to keep the system running and that changes depending on load or work that the computer is doing.
 
That said, that also means that a 1600 W PSU is also NOT going to pull 1600 Watts from the wall 24/7. But what it can do is provide much better efficiency since your system is using between 500 Watts to 750 Watts of power and 1600W divided by 2 is 800 Watts so that is still much more efficient power conversion than a 750W PSU.
 
The 1600 Watt PSU might draw 500 Watts to 700 Watts current power draw out of 1600 Watts maximum power available.
 
So that ends that myth of "Oh dude! You bought a 1600 Watt PSU? Now your computer will use up so much power!"
 
But the real truth is because of the better efficiency you save about $20-$40 bucks a year on your electricity bill because the converted power is not wasted, more of the power is sent to your components because the conversion is more efficient.

mchang1984That said, that also means that a 1600 W PSU is also NOT going to pull 1600 Watts from the wall 24/7. But what it can do is provide much better efficiency since your system is using between 500 Watts to 750 Watts of power and 1600W divided by 2 is 800 Watts so that is still much more efficient power conversion than a 750W PSU.

 
PSU efficiency curves aren't nearly that dramatic. Efficiency tends to peak at around 50% of max draw, but with any 80plus PSU worth buying the curve is going to be pretty flat at anything resembling a reasonable load. The efficiency gap between a good PSU at 50% load and one at ~85% load will often be around %5. In fact the worst inefficiency gap is typically at extremely low loads, in which case low wattage PSUs tend to win out in efficiency just because they're closer to their 50% sweet spot while idling. So in terms of efficiency gains you're typically going to get a better return on your investment by going up in efficiency rating than wattage rating. Really, the best arguments for going overkill on psu wattage comes down to silence and room for future upgrades--it's not unusual for high watt units to run without fans at low loads and for some builds that'll be cheaper than buying a fully passive unit.

Whackywheels
Im running a full hardline loop with 7 fans, 4 3.5 hard drives, 2 nvme drives, a dedicated sound card, a 3090 strix with a 15% oc and a 9900k at 5.1ghz OC all core locked. the 850 G2 runs fine and my killawatt meter only reads at 825 watts under full load even after over 20 minutes of testing. mind you my killawatt meter is also pulling power for my monitor, boom mic and other devices on my desk including router and modem. you'll be fine. 

Okay thank you!

If you are running a 3080 on your 3770k i would highly recommend upgrading. My wife had a 4790k until i had gotten her a 3080 FTW3 and it was bottlenecking HARD. over 30% loss in performance at 4K. bought her the 9700k 3 weeks ago sold the 3080 to a friend and got her a 3090 instead. I got the 9700k for 200 from MC and the mobo for 100 at MC. 
 

I would run 1000 or higher.

I have that power supply with a 3080 XC3 with power limit raised, and a 3800X with PBO / FMAX on. I pull about 550 watt at the wall stressing both at once. My G2 doesn't seem to care at all, which it shouldn't.