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750 watt PSU enough for a 9900k & 3090
- Thread starter Mcthommo
- Start date
Soldato
- Joined
- 26 Dec 2005
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- 16,189
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- Paisley
Id go 850 for sure, i had power issues with 750w on my 3090 unless i undervolted the card (that was with a 750w titanium power supply too).
Associate
- Joined
- 23 Jun 2018
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- Leicester
Yeah, 850 minimum I'd say, but personally I like to go overkill and have a 1200w with 9900k and 3090, why risk it?
Associate
- Joined
- 23 Jun 2018
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- Leicester
Go with that 850 buddy, just stating I use a 1200w
Anyone seen a 1200w sf psu
SX1000 Platinum
80 PLUS Platinum 1000W fully modular SFX-L power supply
https://www.silverstonetek.com/product.php?pid=965&area=en
If your case can take a SFX-L then there is this 1000w. If not then there is only the 850w SFX.
two things you dont want to skip on, mboard q and psu power.
850w can be enough but random spikes and what not can happen.
1000w or more I would go for.
9900K & 3080 owner here with a Corsair RMx 850w PSU...no issues whatsoever and the 3090 doesn't pull that much more power than a 3080.
Even at full load I doubt my entire rig pulls more than 550w.
GPU tops out at ~320w (100% load), CPU @~170w (100% load in Cinebench runs) and everything else ( 5 fans, 4 HD's, 8 USB sockets in use) and that's only when running flat out, which no PC does 90% of the time, unless you're a full time video encoder or 3D renderer, in which case what the hell are you using a 9900K for
Even at full load I doubt my entire rig pulls more than 550w.
GPU tops out at ~320w (100% load), CPU @~170w (100% load in Cinebench runs) and everything else ( 5 fans, 4 HD's, 8 USB sockets in use) and that's only when running flat out, which no PC does 90% of the time, unless you're a full time video encoder or 3D renderer, in which case what the hell are you using a 9900K for
./
Been using the 3090FE with 9900k with corsair 750w SFX unit for nearly a year now.
With that, in 4k gaming, will usually sit around 450w-525w total power draw with 3090 set to 400w and 9900k at stock. With quality units like the SFX 750w even if there are spikes, it copes with it fine. That said, there is 850w so grab that, but for me 0 issues with the above, that's with about 500 hours of play with GPU pegged at near 100% in most cases as its 4k 120hz screen so all horsepower needed in most games like CP2077 etc.
With that, in 4k gaming, will usually sit around 450w-525w total power draw with 3090 set to 400w and 9900k at stock. With quality units like the SFX 750w even if there are spikes, it copes with it fine. That said, there is 850w so grab that, but for me 0 issues with the above, that's with about 500 hours of play with GPU pegged at near 100% in most cases as its 4k 120hz screen so all horsepower needed in most games like CP2077 etc.
Soldato
- Joined
- 22 Nov 2018
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- 2,840
Recommended System Power (W) 750
Requirement is made based on PC configured with an Intel Core i9-10900K processor.
Source: Nvidia
Personally I'd feel more comfortable with an 850w.
Requirement is made based on PC configured with an Intel Core i9-10900K processor.
Source: Nvidia
Personally I'd feel more comfortable with an 850w.
Power usage is an average over a given period of time, so power spikes are naturally included in the rating. It's the actual physical quality of the components that matters.
A higher powered unit may last longer because of capacity, but that would fall within the warranty. A warranty is only beneficial if you actually use it.
Unless you know your components need additional power, the manufacturer's recommendation should be sufficient.
A higher powered unit may last longer because of capacity, but that would fall within the warranty. A warranty is only beneficial if you actually use it.
Unless you know your components need additional power, the manufacturer's recommendation should be sufficient.
Associate
- Joined
- 30 Jun 2006
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- 2,371
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- Cardiff
I use a sff power supply rated at 750w. I have a 3080ti which I have seen alone draw 430W when left toward its own devices. There is only 3 Psu brands I will stick in my builds Corsair AX series non digital, Seasonic and Corsair sff series.
3900x + 3090 and plenty of watercooling gear was fine with a solid 750W, but the efficiency curve would be more favourable on the 850W. Also the main issue with the 3080/3090 isn't only power consumption, but spikes. A 850W would have some more margin before those power spikes causes any issues/random reboots.
Tried Corsair and wasn't really happy with. Seasonic is as solid as a tank on their top tier ranges.
i have a corsair ax 1000 titanium and am trying to figure out how its possible to be unhappy with a power supply, about the only thing i can say about corsair power supplies that might be a pain is the cables are very stiff with the caps in it makes them hard to get where you want them to go
i mean unless this is about a sff range specifically then i dont have any experience with those as i dont build a pc in a shoebox