RTX 4080 with a 750W PSU

[alon123A]

Hi everyone. I just ordered a Gigabyte Eagle OC 4080. I'm using an i7 10700 and my PSU is a Corsair CX750W.
In the GPU's official page they mention 850W as the recommended voltage but in every Youtube video I've seen, the entire system power usage rarely goes above 400.
Do I need to upgrade my PSU or am I completely safe?

Update: Comments have convinced me and I'm getting an Antec hcg 850w gold even though most chances are everything will work fine with my current PSU.

 

[Chomiq]

You will be perfectly fine with a 750W seeing how power draw on it is lower than on a 3080 Ti.

 

[GamerGuy]

You're getting an expensive GPU, yet wanna cheap out with your present 750W PSU which isn't recommended, if you wanna risk it, by all means listen to the guy in post above mine. Honestly, I don't understand people who are ready and willing to pony up cold cash for an expensive GPU, yet are unwilling to buy a good PSU (which costs a fraction of the GPU) to go with that GPU.

Might I remind Chomiq that his Gold rated Seasonic PSU is better than OP's Bronze rated Corsair one.....

 

[alon123A]

You're getting an expensive GPU, yet wanna cheap out with your present 750W PSU which isn't recommended, if you wanna risk it, by all means listen to the guy in post above mine. Honestly, I don't understand people who are ready and willing to pony up cold cash for an expensive GPU, yet are unwilling to buy a good PSU (which costs a fraction of the GPU) to go with that GPU.

Might I remind Chomiq that his Gold rated Seasonic PSU is better than OP's Bronze rated Corsair one.....

I'm absolutely not cheaping out. I just don't see the point in upgrading a PSU from 750w to 850w when the overall system power usage rarely goes above 400 in every youtube video review.

 

[Chomiq]

You're getting an expensive GPU, yet wanna cheap out with your present 750W PSU which isn't recommended, if you wanna risk it, by all means listen to the guy in post above mine. Honestly, I don't understand people who are ready and willing to pony up cold cash for an expensive GPU, yet are unwilling to buy a good PSU (which costs a fraction of the GPU) to go with that GPU.

Might I remind Chomiq that his Gold rated Seasonic PSU is better than OP's Bronze rated Corsair one.....

It's also a 320W TDP gpu.

OP - what resolution/refresh rate are you running?

 

[Hofnaerrchen]

I'm absolutely not cheaping out. I just don't see the point in upgrading a PSU from 750w to 850w when the overall system power usage rarely goes above 400 in every youtube video review.

And how would you describe pairing a 1200$+ GPU with a 80$ bronze level 750W PSU? From a power consumption standpoint it will more than likely work but as the 4080 needs at least 3 PCIe power-cables you will probably use bifurcated cables on your new GPU - that's not so smart.

 

[alon123A]

It's also a 320W TDP gpu.

OP - what resolution/refresh rate are you running?

4k 120hz

And how would you describe pairing a 1200$+ GPU with a 80$ bronze level 750W PSU? From a power consumption standpoint it will more than likely work but as the 4080 needs at least 3 PCIe power-cables you will probably use bifurcated cables on your new GPU - that's not so smart.

Why is using bifurcated cables bad for the GPU?

 

[Chomiq]

4k 120hz

Then expect highest power usage possible if you're playing anything demanding.

 

[P4-630]

RTX 4080, 4K 120Hz monitor, cheap 750W bronze rated PSU......

 

[Hofnaerrchen]

Why is using bifurcated cables bad for the GPU?

Because you are using - by todays standards - a below mid-level PSU. Depending on the age of your PSU components have already aged and putting already relatively cheap components under more stress is rarely a good idea. Bifurcated cables are fine for sub-200W-GPUs but you should not use them on anything that uses at least 2 8-pin connectors.

Edit: Not to forget you are going to use bifurcated cables on a bifurcated adapter (not a good idea either), that is - in contrast to your PSU's bifurcated cables - laid-out to take up to 450W and you are going to get a custom design OC card. Expect it to pull more power than the FE card.

PS: Be cautious to plug the adapter correctly into your new GPU.

 

[64K]

All I will say on this is spend some money on at least a quality 750 watt PSU. You may get away with using that CX 750 but remember your system doesn't have to shut down entirely to be a problem. You can be doing damage incrementally to your hardware without any obvious signs.

In tests done here a 4080 can have spikes of 370 watts.

You asked for advice. My advice is to get a quality PSU to protect that extremely expensive hardware.

 

[izy]

My old 530W gold PSU didnt had any trouble powering an 300w gpu and is still working on my work system now. Back then was on 1700x + 280x and after an 290x then 580x , now im using it with an 2060 super and 5700x.

Edit: and i was overclocking them
- PSU: thermaltake smart se 530w
Estimate full load max, 1700x oc 200w, 290x 350w. + rest of the components.

 

[alon123A]

Comments have convinced me and I'm getting an Antec hcg 850w gold.

 

[Hofnaerrchen]

The easy solution to this: Contact the Corsair Customer support and get written affirmation that your current PSU will just work fine with your new GPU. If they are hesistant to do that just a little bit get a new PSU

 

[GamerGuy]

I'm absolutely not cheaping out. I just don't see the point in upgrading a PSU from 750w to 850w when the overall system power usage rarely goes above 400 in every youtube video review.

Don't just get enough or recommended, go above that for future proofing (I hate bandying the term), I had a 3900X + RX 6900 XT, but have upgraded to a 5900X. I will be getting an RX 7900 XTX. Yet, I have no worries about my 3 years old PSU, it was more than just recommended or adequate even when I'd built my rig 3 years back. I'd gotten a Corsair HX1000 Platinum Edition and I'm confident that, despite being 3 years old, it's more than adequate for the 5900X and 7900 XTX.

IF you have in mind to get a new PSU to err on the side of safety, get a 1000W unit (or higher) just for that extra piece of mind and upgradability....if you'd just look at my system specs, you'd see ALL my PSU are above recommended, my HX1000 Plat PSU is actually the weakest in terms of sheer power, the other two being 1250W and 1500W units.

 

[alon123A]

Don't just get enough or recommended, go above that for future proofing (I hate bandying the term), I had a 3900X + RX 6900 XT, but have upgraded to a 5900X. I will be getting an RX 7900 XTX. Yet, I have no worries about my 3 years old PSU, it was more than just recommended or adequate even when I'd built my rig 3 years back. I'd gotten a Corsair HX1000 Platinum Edition and I'm confident that, despite being 3 years old, it's more than adequate for the 5900X and 7900 XTX.

IF you have in mind to get a new PSU to err on the side of safety, get a 1000W unit (or higher) just for that extra piece of mind and upgradability....

Future proofing probably won't happen on this generation because of the new ATX 3 build ,Unless you really want to but something expensive.

 

[GamerGuy]

Future proofing probably won't happen on this generation because of the new ATX 3 build ,Unless you really want to but something expensive.

Well, at least not with AMD, the RX 7900 XTX is still on the good old reliable 2x 8pin PCIe power connectors. This issue now with you is, if you pony up for a new PSU now, you might just have to upgrade again when the new ATX3.0 PSUs become available next year. You can always try it with your present PSU, but I'd not advise it. Honestly, I'd rather stick with the older PSU standards, running so much power thru thinner cables and a smaller plug doesn't sound like a good idea to me.

 

[QuietBob]

You may be OK wattage wise, seeing as the 4080 Eagle has the same 320w TBP as the FE, and the 10700 non-K pulls around 250w with power limits removed. Still, accounting for some extra hardware and potential power spikes with your new GPU, you could be approaching 700w in a worst case scenario.

More importantly, the CX750 is a six year old design at this point. It is also Corsair's lowest tier of PSUs, aimed at budget builders. I'd recommend at least a Gold-rated 850w PSU -- a reliable model from a reputable manufacturer. The PSU Tier List is a very good place to start.

The Antec HCG 850w Gold is a great choice, based on the acclaimed Seasonic Focus platform. You should have no problems with that PSU and the 4080.

 

[GerKNG]

no problem.

 

[dirtyferret]

Might I remind Chomiq that his Gold rated Seasonic PSU is better than OP's Bronze rated Corsair one.....

Might I remind gamerguy, Chomiq may know a thing or two about PSU that he does not especially when reading some of his comments

I'm absolutely not cheaping out. I just don't see the point in upgrading a PSU from 750w to 850w when the overall system power usage rarely goes above 400 in every youtube video review.

if anyone claims you are "cheaping out" ask them for their CC number to buy the hardware

a below mid-level PSU

what is a mid level PSU???

The Antec HCG 850w Gold is a great choice, based on the acclaimed Seasonic Focus platform

unless of course the GPU triggers the "acclaimed" seasonic sensitive OCP which the cx750 does not suffer from. Not saying the CX is a better build but it does not have a sensitive OCP...

It is also Corsair's lowest tier of PSUs, aimed at budget builders.

actually it sits above the VS series but definately aimed at budget conscious shoppers

 

[GamerGuy]

Might I remind gamerguy, Chomiq may know a thing or two about PSU that he does not especially when reading some of his comments

Okay, he may be a PSU guy and I'm not. But seeing that OP's PSU is Bronze rated, and has perhaps some years on it, I'm for OP upgrading his PSU just to be on the safe side. It's all fine if I tell OP it's safe and he'd have no problem running the RTX 4080 with that PSU, but should something bad happen, will I be held responsible? The best I could do is, "Hey man, sorry that PSU died and took your GPU/system with it". With that, I've absolved myself of all blame and responsibility, and *insert sarcasm* I'm sure the OP would take great comfort in that.

I'm more for a conservative approach, after all, I may be risking someone else's hardware should I give ill-conceived advice. My thinking is, IF OP can afford a spanking new RTX 4080, pretty sure a new higher tier PSU is within reach as well. I'm NOT saying that the 750W PSU can't power his system with the RTX 4080, most probably could, but who knows what transient power spikes the RTX 4080 has, or is capable of, so a conservative approach would be best.

 

[izy]

He can just test the current PSU with the 4080 and if something bad happens he can just replace it , pretty low probability that if the PSU goes bad it will burn the GPU (i had an old 400W PSU long time ago that blew up and nothing happened to the system, and yes i know sometimes it can fk up components but i dont think its the case with Corsair CX750W) , it has some protections, but if he has have money to spend he can just go for a new one and thats it but probably he wanted to save some money and thats why he asked here in the first place.

 

[dirtyferret]

But seeing that OP's PSU is Bronze rated, and has perhaps some years on it, I'm for OP upgrading his PSU just to be on the safe side.

a bronze rating has nothing to do with being able to proved power and stay within spec though. The latter, your opinion is fine nothing wrong with stating it.

It's all fine if I tell OP it's safe and he'd have no problem running the RTX 4080 with that PSU, but should something bad happen, will I be held responsible?

Why would you be held responsible. The cx750 is safely built, if anything "bad" happens its safety features would kick in assuming everything is up to par (it should be).

I'm more for a conservative approach, after all, I may be risking someone else's hardware should I give ill-conceived advice

Nothing wrong with being conservative but once again not sure about what you think is "risking" or "ill-conceived"

IF OP can afford a spanking new RTX 4080, pretty sure a new higher tier PSU is within reach as well. I'm NOT saying that the 750W PSU can't power his system with the RTX 4080, most probably could, but who knows what transient power spikes the RTX 4080 has, or is capable of, so a conservative approach would be best.

not arguing, it's logical advice. Just not sure why you went after chomiq as he gave a similar spin but different opinion.

I'm NOT saying that the 750W PSU can't power his system with the RTX 4080, most probably could - gamerguy
You will be perfectly fine with a 750W seeing how power draw on it is lower than on a 3080 Ti. - chomiq

had an old 400W PSU long time ago that blew up and nothing happened to the system

 

[GamerGuy]

not arguing, it's logical advice. Just not sure why you went after chomiq as he gave a similar spin but different opinion.

I went after Chomiq, when? Are you referring to this?
Might I remind Chomiq that his Gold rated Seasonic PSU is better than OP's Bronze rated Corsair one.....

Does this qualify as 'went after'? If so, I'm afraid we have a deeply divided definition of that term. For me, IF I were to 'go after' someone, it'd be in the form of personal and ideological attacks, I merely reminded him that his Gold rated Seasonic is better than a Bronze rated Corsair PSU, was this 'going after' him?

Anyway, to prevent myself from getting worked up, as I sometimes do, I've put you on my 'ignore' list and would not be replying to your posts concerning the matter here any more. If you're so inclined, kindly return the favor....

 

[QuietBob]

unless of course the GPU triggers the "acclaimed" seasonic sensitive OCP

My understanding is that the issue was fixed sometime in 2018/2019 with a platform refresh. The current Focus line does not appear to be affected.

actually it sits above the VS series

Are those still being sold? Corsair don't even list them on their website. And even when new they were only good for office builds.