GeForce RTX 5090 Power Excursions Tested: Can Spike to 901W Under 1ms

Macro Device · Jan 24, 2025

kondamin said:
So you are buying a 3000 usd video card and not getting a new PSU…

The fact you have money doesn't mean you must be robbed. Please don't be an enabler. 450 W was horrendous as it is, 575 is nVidia just throwing another "not my problem" card right in our face.

NB: I am okay with GPUs consuming this much power (or even more) under XOC but at stock, sanity must remain. I have not yet concluded where the sanity and insanity meet each other but it's right around 260 to 320 W.

phanbuey · Jan 24, 2025

It's physically uncomfortable gaming next to the rig at full blast. Like the right side of my body being 5 degrees warmer than the left is a bit immersion breaking.

Gasaraki · Jan 24, 2025

You guys think a 1ms spike will cause the cable to spontaneously combust? Get real.

LabRat 891 said:
If the cable/conductors aren't losing heat faster than they're gaining, they'll eventually runaway under sustained load. -Regardless of peaks.
Not to mention, physical migration/movement from thermal expansion/contraction...

The spec is designed for 600W continuous load. No cable is melting. If the spec is designed for 600W continuous, that means there's probably a 20% buffer built in, so the cable can support 720W.

gridracedriver · Jan 24, 2025

But do you remember the RX480 that melted the mobos for peak consumption? good times of terrible misinformation against AMD, Nvidia is the Intel of the 2000s with the press in favor and everyone silent.

Ruru · Jan 24, 2025

So basically you need a 1.2kW PSU to be on the absolutely safe side. I still remember when those were mostly for HEDT rigs with SLI/CF or something similar.

gridracedriver said:
But do you remember the RX480 that melted the mobos for peak consumption? good times of terrible misinformation against AMD, Nvidia is the Intel of the 2000s with the press in favor and everyone silent.

Remember that issue but did it even cause anything else than negative PR? I guess that PCIe has some headroom over its 75W spec.

InVasMani · Jan 24, 2025

Does this GPU identify as a microwave yes or no Jensen answer the question.

claster17 · Jan 24, 2025

Guys...

Stop panicking. This is all well within ATX 3.0 spec.

evernessince · Jan 24, 2025

JustBenching said:
A good 1k or 1.2k psu should be able to without triggering ocp without the atx specification required.

1,000 watts is the bare minimum with an efficient CPu I believe. TechYesCity was getting full system shutdowns with a 850w unit and a 7800X3D. With an Intel CPU 1.2K is minimum.

Gasaraki said:
You guys think a 1ms spike will cause the cable to spontaneously combust? Get real.

The spec is designed for 600W continuous load. No cable is melting. If the spec is designed for 600W continuous, that means there's probably a 20% buffer built in, so the cable can support 720W.

Max rated wattage is 684w: https://en.wikipedia.org/wiki/16-pin_12VHPWR_connector

That said the cable is designed to carry 600w. Anything above that is iffy depending on manufacturing variance. Ironically the 5090 astral does exceed 600w...

Look at the margin compared to the 8 pin, world of difference.

JustBenching · Jan 24, 2025

evernessince said:
1,000 watts is the bare minimum with an efficient CPu I believe. TechYesCity was getting full system shutdowns with a 850w unit and a 7800X3D. With an Intel CPU 1.2K is minimum.

Lol, ok man. My 9800x 3d draws more power in gaming than my 12900k, but sure, you do you.

Gasaraki · Jan 24, 2025

motov8 said:
600w is too much for a room without air conditioning. This is an oven. I don't want to know how someone doesn't have air conditioning and has 28'C in the room in the holidays playing on a 200-250 watt graphics card like me.

The card is not putting out 600W of heat. This is not a heater. The energy is used to do work. A 600W resistive heater doesn't even put out 600W of heat, it has losses.

londiste · Jan 24, 2025

Gasaraki said:
The card is not putting out 600W of heat. This is not a heater. The energy is used to do work. A 600W resistive heater doesn't even put out 600W of heat, it has losses.

With electronics, the energy used to do work is effectively theoretical. For practical purposes all the consumed energy goes into heat output.

chrcoluk · Jan 24, 2025

LabRat 891 said:
Let the 12V-2x6 burninating, begin! (again)

12V-3x4 already off the drawing board and ready to go.

Gasaraki · Jan 24, 2025

evernessince said:
1,000 watts is the bare minimum with an efficient CPu I believe. TechYesCity was getting full system shutdowns with a 850w unit and a 7800X3D. With an Intel CPU 1.2K is minimum.

Max rated wattage is 684w: https://en.wikipedia.org/wiki/16-pin_12VHPWR_connector

That said the cable is designed to carry 600w. Anything above that is iffy depending on manufacturing variance. Ironically the 5090 astral does exceed 600w...

Look at the margin compared to the 8 pin, world of difference.

Surprised it only has a 1.1 safety factor instead of 1.2 like in home electrical wires.

DemonicRyzen666 · Jan 24, 2025

claster17 said:
Guys...

Stop panicking. This is all well within ATX 3.0 spec.

No technically it's not it's 901 watts, it's 1 watt over it. lol

trsttte · Jan 24, 2025

Timbaloo said:
This thread is about spikes though, and these really don’t matter from a thermal point of view.

They do if they happen frequently enough, but it's off topic yes

Gasaraki said:
there's probably a 20% buffer built in

Not with this connector there isn't

katzi · Jan 25, 2025

The RMA's are going to be *Wild*

jnv11 · Jan 25, 2025

Lots of pre-ATX 3.0 power supply units are likely to prematurely fail due to not being designed to handle these high magnitude power spikes if they are connected to an RTX 5090.

How will power supply reviewers have to modify their methodologies to account for new video cards which routinely generate ridiculously large power spikes like RTX 5090 video cards are prone to doing?

When these power spikes eventually destroy the power supply units that were not designed to ATX 3.x standards, how would those power supply units fail, and what effects should we expect when they do fail? Will they just be unable to start and be dead, or would they spark, smoke, or catch fire? I am not an expert in how power supply units fail.

JustBenching · Jan 25, 2025

jnv11 said:
Lots of pre-ATX 3.0 power supply units are likely to prematurely fail due to not being designed to handle these high magnitude power spikes if they are connected to an RTX 5090.

How will power supply reviewers have to modify their methodologies to account for new video cards which routinely generate ridiculously large power spikes like RTX 5090 video cards are prone to doing?

When these power spikes eventually destroy the power supply units that were not designed to ATX 3.x standards, how would those power supply units fail, and what effects should we expect when they do fail? Will they just be unable to start and be dead, or would they spark, smoke, or catch fire? I am not an expert in how power supply units fail.

Why would they fail? There is 0 reason for a well built PSU to fail, especially not because of power spikes. It will trip the over current protection and shut down. As long you are not running your PSU at 100% capacity all day long (so probably you should avoid an 850w PSU with a 5090) youll be fine.

hurakura · Jan 27, 2025

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GeForce RTX 5090 Power Excursions Tested: Can Spike to 901W Under 1ms

Macro Device

phanbuey

Gasaraki

gridracedriver

Ruru

S.T.A.R.S.

InVasMani

claster17

evernessince

JustBenching

Gasaraki

londiste

chrcoluk

Gasaraki

DemonicRyzen666

trsttte

katzi

jnv11

New Member

JustBenching

hurakura

NorthridgeFix

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