Question 1000W good enough for 5090 ?

[SydneyAngel]

Build in my sig.

THe highest i have seen is 600 watts playing BF 2042. So in theory i should add 275 watts on to that which is 875 with a head room of 125. Is that enough ?

 

[Lutfij]

Build in my sig.
Sig space specs can and will change over time and when that happens this thread and it's relevant suggestions are going to be rendered moot to the end user in the same boat as you're in now.

Please mention the make and model of your PSU that you have to work with. Include it's age since an aged unit will not output the same amount of power due to internal wear and tear.

NVIDIA GeForce RTX 5090 Specs

NVIDIA GB202, 2407 MHz, 21760 Cores, 680 TMUs, 176 ROPs, 32768 MB GDDR7, 1750 MHz, 512 bit

www.techpowerup.com

Would say you need at least a 950W PSUY but you should add more to that for headroom, so a 1.2KW would be a good wattage to look at, IMHO.

 

[Gaidax]

Build in my sig.

THe highest i have seen is 600 watts playing BF 2042. So in theory i should add 275 watts on to that which is 875 with a head room of 125. Is that enough ?

If you read the reviews - there are cases when the card can pull 640w too, and partner boards went as far as 730w! The 575/600w is not the actual hard limit for it.

Now, these are the most extreme cases, likelihood you'd just stumble on that case is not great, but it could happen.

If you have the $$ to buy 5090, you most definitely want to invest into 1500w PSU or more, that's like peanuts in comparison and who knows what kind of GPUs we will have 2 gens from now when you might get another urge.

 

[SydneyAngel]

14700K
Z790-E Strix
6400 DDR5 Renagade Kingston
ROG 1000 Thor Plat 2
4070ti Super Tuff OC

Also my PSU is less then 5 monthjs old

 

[SydneyAngel]

Build in my sig.
Sig space specs can and will change over time and when that happens this thread and it's relevant suggestions are going to be rendered moot to the end user in the same boat as you're in now.

Please mention the make and model of your PSU that you have to work with. Include it's age since an aged unit will not output the same amount of power due to internal wear and tear.

NVIDIA GeForce RTX 5090 Specs

NVIDIA GB202, 2407 MHz, 21760 Cores, 680 TMUs, 176 ROPs, 32768 MB GDDR7, 1750 MHz, 512 bit

www.techpowerup.com

Would say you need at least a 950W PSUY but you should add more to that for headroom, so a 1.2KW would be a good wattage to look at, IMHO.

Will back down the power limit allow for better headroom ? I would be looking into a new thor 3 but at this time there is no release date for it

 

[SyCoREAPER]

Will back down the power limit allow for better headroom ? I would be looking into a new thor 3 but at this time there is no release date for it

Then why buy it? It's already only 27-35% faster than a 4090. If you can afford a 5090 don't be cheap and buy a proper power supply.

Or use a 1000w and find out the hard way. The question has been answered.

NO. A 1000w is not enough and cutting it way too close at best and not enough to be safe.

 

[rcald2000]

SydneyAngel​

Hello. Were it me: I would just try your existing power supply. As long as it's not poor quality, which yours isn't, then there's miniscule risk of your rig or GPU becoming damaged. I would try it, and then buy a $25 USD wattage meter for peace-of-mind. As a convenience, a Multi-Outlet Extension Cord plugged into the wall, then my wattage meter (Kill A Watt P3 P4400), and my my power supply cable plugged into that watt meter. The extension cable makes it convenient to look at the wattage figure next to your computer, instead of at the outlet. The "multi-outlet" extension card allows the wattage meter to lay somewhat flat on the floor, unlike a single connector extension cord.

-- OR --

You could wait until you get your hands on a RTX 5090, which might take some time. By then, perhaps Corsair will have released their 2025 HXi lineup of power supplies, which have wattage metering and other electrical analytics built into the unit. Then you could bypass purchasing the wattage meter and extension cord all together: https://www.techpowerup.com/330908/corsair-shows-off-2025-rme-series-and-2025-hxi-series-psus-at-ces

Also, Corsair's existing HXi lineup is still available for purchase: https://www.amazon.com/CORSAIR-HX1200i-Modular-Ultra-Low-Supply/dp/B0CTR6PK19/

 

[SydneyAngel]

SydneyAngel​

Hello. Were it me: I would just try your existing power supply. As long as it's not poor quality, which yours isn't, then there's miniscule risk of your rig or GPU becoming damaged. I would try it, and then buy a $25 USD wattage meter for peace-of-mind. As a convenience, a Multi-Outlet Extension Cord plugged into the wall, then my wattage meter (Kill A Watt P3 P4400), and my my power supply cable plugged into that watt meter. The extension cable makes it convenient to look at the wattage figure next to your computer, instead of at the outlet. The "multi-outlet" extension card allows the wattage meter to lay somewhat flat on the floor, unlike a single connector extension cord.

-- OR --

You could wait until you get your hands on a RTX 5090, which might take some time. By then, perhaps Corsair will have released their 2025 HXi lineup of power supplies, which have wattage metering and other electrical analytics built into the unit. Then you could bypass purchasing the wattage meter and extension cord all together: https://www.techpowerup.com/330908/corsair-shows-off-2025-rme-series-and-2025-hxi-series-psus-at-ces

Also, Corsair's existing HXi lineup is still available for purchase: https://www.amazon.com/CORSAIR-HX1200i-Modular-Ultra-Low-Supply/dp/B0CTR6PK19/

Thats what i was thinking myself. I have had systems in the past which pushed the limits of the PSU and the worst thing that happend would your syhstem would just restart

 

[ilukey77]

Im more worried about the 12vhpw cable on the 5090 more than what PSU

I would say anything 1200 plus for most systems will be fine 80 titanium rated to be on the safe side