My 3080Ti FTW3 Ultra should arrive in a couple of days, but I'm already worrying that my SFX 600W power supply might not be enough to make it stable.
CPU is the old but legendary Haswell 4790K, which I think it's already quite power hungry.
A new PSU for my ITX build would only go up to 750W and sets me back 150+€ more...
 
So, do you think that undervolting would be the way to go? 
 
Thanks

 I have been using the precision x1 and strictly setting the power cap at 60%  and setting the fans to 65%
4 k resolution.
This is a snap shot while I am playing a game ( Ashes of Creations )

By capping the power I can reduce the wattage consumption by about 160 watts and reduce the heat down to what you see in this pic. These numbers are fairly steady while playing. Slight fluctuation no more than 75 or so core clock Mhz. Highest and lows I see is 1965 to 1885 ish on average and it mainly sits where it shown in the snap shot. Depending on games may show a lesser number by a little but stays up over 1800 usually. FPS in games is not much different then settings are at default.  
The voltage is left alone and run by the  cards programming.
 
 

Kreedence
I can confirm with the Precision X 1  my total wattage used in about 400 to 425 watts on a load for my entire computer when I cap the power at 60%. I do see some spikes but they tend to be no higher then 500 watts at most. As my post above shows I still get performance while gaming. Without playing with the voltage.
 
Your card in particular  is recommended 850 PSU. It will draw on default settings between 585  to 675 watts and will push 700+ on occasion on a full load. So really do consider a proper PSU supply to start with. BUt yes you can under power the card or undervolt to lower wattage. I just find P X1 to be easy...

 
Thanks mate, I feel more reassured now, will lower the power limit to 60% and see how it holds.
 
Might hold on ordering the SFX 750W PSU until I redo my entire PC with, likely, a 5800X.
 
Regards,

There isn't, afaik, an 850W SFX PSU. Current max is 750W on SFX (for ITX builds) ;)

I got mine stable at 875mV/1920mhz. Shaved 6-7 Degs in Warzone, it was going for about 72 deg c. Now its sitting around 66 deg c! I'm using MSI AB. Only switched to X1 if need to change the RGB or firmware update. 
 
Undervolted Superposition 4k optimized
17445 points / Max temp 73 deg / Min FPS 106.92 / Avg 130.48 / Max 157.63
 
Stock Superposition 4k optimized
16921 points / Max temp 77 deg / Min FPS 97.91 / Avg 126.57 / Max 155.84

hksiew
I got mine stable at 875mV/1920mhz. Shaved 6-7 Degs in Warzone, it was going for about 72 deg c. Now its sitting around 66 deg c! I'm using MSI AB. Only switched to X1 if need to change the RGB or firmware update. 
 
Undervolted Superposition 4k optimized
17445 points / Max temp 73 deg / Min FPS 106.92 / Avg 130.48 / Max 157.63
 
Stock Superposition 4k optimized
16921 points / Max temp 77 deg / Min FPS 97.91 / Avg 126.57 / Max 155.84

To compare the temps I makes sense to set the fanspeed to the exact same value. 

I use AfterBurner and I use the OC scanner because it 'optimizes' the lower voltage bins FAR higher than the upper voltage bins which is great for old games that can't push this card even in the slightest.
 
So for me I have all sliders at default except +200 for memory & 79% power limit & let the OC Scanner do its thing & see around +185 core on the voltage bins below .800 so the card typically in game at max details @3840x1600 is typically less than 50-70% gpu load & therefore the card uses around 120-160watts playing for example BioShock Infinite fully maxed because the GPU load is so low that the core clock stays around 1100 or so due the the GPU load not asking for higher speed bins.
 
The heaviest use case for me is Apex legends & for that game I use a 104% power limit & a 74% fixed fan speed in an open 'case' (Dimastech) I use headphones so I don't notice the air noise & in game I am seeing 2040-2070 core clocks. I also use the OC scanner for the voltage/frequency curve. Load temps are in the 55-63C range, GPU load is typically 70-95%, and the GPU voltage is typically around 1.043 with spikes up to 1.0825 or something like that.
 
 
edit: I also wanted to add by capping the power limit to 79% the max power draw I have seen is 312watts when I forget to enable the 104% profile when playing Apex.

shadowbladelight
Mine is running at 0.906mv at 1980mhz and +600 to the memory. Never goes above 70c with the fans at 950-1000 rpm (33%).

Sounds pretty dangerous and a good way to overheat and blow out the card on an unexpected load.

I’ve got mine at 0.900V at 1905Mhz and it’s running 7C less on GPU and 200 RPM less fan speed with no drop in performance.

kevinc313

shadowbladelight
Mine is running at 0.906mv at 1980mhz and +600 to the memory. Never goes above 70c with the fans at 950-1000 rpm (33%).

Sounds pretty dangerous and a good way to overheat and blow out the card on an unexpected load.

What? How? It's going to step up if it needs to and certainly the temps are fine.

gpu temps only tell half the story
games utilizing the entire gpu(rtx and dlss) most certainly can and will max out the power limit,even with a custom voltage curve
If the vram is not sufficiently cooled (low fan speed,poor air flow) it will overheat without you even realizing it.
 

AngryGamer94
gpu temps only tell half the story
games utilizing the entire gpu(rtx and dlss) most certainly can and will max out the power limit,even with a custom voltage curve
If the vram is not sufficiently cooled (low fan speed,poor air flow) it will overheat without you even realizing it.
 

Can't stress the enough.  Put my 1300w Seasonic Prime into protect shutdown while locking 1V and 2,040 mhz on a DX11 game in 4K VRR at ~425w.  Some of these newer games with poor optimization (like New World) can easily produce a full power load at .9V vcore, or even less.  So if can't cool your card properly, set your power limit to actually restrict temps, not undervolt.

16kfp01
I have a 3080 TI with a chinese open frame test bench as a daily. I sandwich the 3080 it’s radiator with fans. 2ghz @@950 mlv and my temps are 46c full load. 43c-44c if I ramp the fans to 100%. I will get rid of the 4 stock fans on the 3080 ti radiators and getting some artic p12s and plan on having it run 100% all the time while also being quiet. =}

I put P12s on my kingpin and you are right the P12 at 100% are very quiet , but I thing peak efficiency is more like 80% , in my KPE rad the extra 20% blew a little harder but it didn't make the temperature cooler on a Radiator that size, but i also has the glass panels in also.

16kfp01
That’s cool. Yk I thought about testing 80% fan speed vs 100%. I like the King Pins what 360 radiator? Id love to put that in front of my open frame case aha. But I just bought the p12 I originally going to buy the slim version which performs identical or little bit better but sadly it was all out of stock everywhere :(. Sandwich lay out would have been much slimmer and slick.

p12 is Such great fan for sound vs pressure and add that you can get 5 for the price of 1 Noctua and its off the chain . 
I still put the Noctuas on my Radiator now because I had already put in the order and wanted to A/B them myself 

kevinc313

AngryGamer94
gpu temps only tell half the story
games utilizing the entire gpu(rtx and dlss) most certainly can and will max out the power limit,even with a custom voltage curve
If the vram is not sufficiently cooled (low fan speed,poor air flow) it will overheat without you even realizing it.
 

Can't stress the enough.  Put my 1300w Seasonic Prime into protect shutdown while locking 1V and 2,040 mhz on a DX11 game in 4K VRR at ~425w.  Some of these newer games with poor optimization (like New World) can easily produce a full power load at .9V vcore, or even less.  So if can't cool your card properly, set your power limit to actually restrict temps, not undervolt.

I've a feeling "The Ascent", a new game from a small Swedish studio, is a similar story. The game runs like an absolute dog on DX12 with Ray Tracing on, and my 3090 acts weird. GPU utilisation all over the place, framerates and frametimes all over the place, a creaky sort of coil whine that I never normally hear. The temps themselves look absolutely fine (58C GPU, 82C memory junction), but I've stopped playing until they release some patches because I can tell my system is having a horrible time trying to run it