Is 650W enough for RTX 4070?

[braveheart0707]

Should probably also mention that my friend is running a similar build with a 3070 Ti FE on a 550W PSU.

[Dedayog]

6 minutes ago, braveheart0707 said:

Should probably also mention that my friend is running a similar build with a 3070 Ti FE on a 550W PSU.

You're more than fine with a 650w for a 4070.

 

Hopefully you can critically think about the responses in this thread and what's behind them, coming to a confident conclusion.

 

 

[emothxughts]

On 4/14/2023 at 4:48 AM, braveheart0707 said:

5800X3d

32GB DDR4

A couple of SSD, one HDD.

Seasonic GX-650 80 Plus Gold.

Newegg calculation puts it at under 600W.

Do I need a PSU upgrade or is it okay? (like barely okay or plenty okay?)

I did ask a question about the most powerful GPU that can run on my 650w 80+ bronze PSU. One of the replies say they're running an RTX4070Ti on a 650w PSU just fine. Since you're seeking a 4070 non-Ti (therefore less power than Ti), you should be fine. That 200w GPU power thing is when it's running at full power in stress tests, in actual games it should run for less power, even less so if you undervolt.

[Mark Kaine]

On 4/13/2023 at 10:53 PM, Tomberry said:

 i would not recomend try and get a 850w unit

negative 

 

On 4/13/2023 at 10:48 PM, braveheart0707 said:

Seasonic GX-650 80 Plus Gold.

wattage should be good, gpu 200-220, cpu 120, rest of system 100 ... plenty of headroom there.

 

 

example my 3070 uses 270w and overall system uses just around 400-500w max, zero problem for my rmi 650

[Princess Luna]

Just gonna slide this in here:

Spoiler

 

[TTboyx]

On 4/23/2023 at 4:14 PM, Princess Luna said:

Just gonna slide this in here:

  Hide contents

 

This chart means an entire system including Cpu/HDD/fans etc? 

[Princess Luna]

On 11/11/2023 at 9:50 PM, TTboyx said:

This chart means an entire system including Cpu/HDD/fans etc? 

Yes, the whole thing.

 

I also would like to note I run my RX 6950XT system on a 650w PSU.

[TTboyx]

31 minutes ago, Princess Luna said:

Yes, the whole thing.

 

I also would like to note I run my RX 6950XT system on a 650w PSU.

Damn you insane for that lol

[DeerDK]

11 hours ago, TTboyx said:

Damn you insane for that lol

I ran a 5600x + 4070 combo on a 460w psu before i upgraded to a 750w sfx-l (due to space limitations). No issues. Its not a powerhungry card at all.

[TTboyx]

1 hour ago, DeerDK said:

I ran a 5600x + 4070 combo on a 460w psu before i upgraded to a 750w sfx-l (due to space limitations). No issues. Its not a powerhungry card at all.

Oh okay

[cooky560]

Way too many people think you need a 50000w PSU these days. I've ran a 3080 at 350w and a 5900x on a 750w, with no issues at all. 

The quality of the psu is far, far more important than the wattage, since most people barely use 500w in their systems.

 

If you have a 4090 and a 13900K with lots of exotic hardware like water pumps etc, you might need a 1000w psu

[DeerDK]

51 minutes ago, cooky560 said:

Way too many people think you need a 50000w PSU these days. I've ran a 3080 at 350w and a 5900x on a 750w, with no issues at all. 

The quality of the psu is far, far more important than the wattage, since most people barely use 500w in their systems.

 

If you have a 4090 and a 13900K with lots of exotic hardware like water pumps etc, you might need a 1000w psu

Yeah, GamerDude really took offence when we pointed that out....

[ewitte]

It is fine if it is a good-quality PSU.  The specs cover all power supplies even those of questionable quality.  I can barely pull 600-650W full system with a 4090 and 7950x.

[ewitte]

On 4/14/2023 at 12:35 AM, DeerDK said:

For a 200w card?!? 

That sounds like massive overkill to me 

Uses about 650W at the high end.  The very least I would be comfortable is 25% over that which would be just under 850W.  A good quality PSU would be built to handle more than that.  I'm using a 1Kw but the tests I saw showed it can handle as high as 1.5kw.

[DeerDK]

6 minutes ago, ewitte said:

Uses about 650W at the high end.  The very least I would be comfortable is 25% over that which would be just under 850W.  A good quality PSU would be built to handle more than that.  I'm using a 1Kw but the tests I saw showed it can handle as high as 1.5kw.

Its been 6 months, are we doing this again?

Also, in what world does a 5800x3d + 4070 set up use 650w?

[Dedayog]

5 hours ago, cooky560 said:

Way too many people think you need a 50000w PSU these days. I've ran a 3080 at 350w and a 5900x on a 750w, with no issues at all. 

The quality of the psu is far, far more important than the wattage, since most people barely use 500w in their systems.

 

If you have a 4090 and a 13900K with lots of exotic hardware like water pumps etc, you might need a 1000w psu

Well since the 3080 can peak to 300w+, it's not ideal to have a 350w PSU is it?

 

I can also run my BMW M3 on 89 octane too.  Not ideal.  

 

I prefer to have ample power for my components to perform at their utmost.  Artificially reducing this by limiting power is a choice one can make I guess. 

 

Not saying you need 1000w for a 3080 but you should at least cover the machines peak usage, no?

 

Edit:  Removed potentially offensive comments, not useful to the discussion.

[starsmine]

1 hour ago, Dedayog said:

Well since the 3080 can peak to 300w+, it's not ideal to have a 350w PSU is it?

 

I can also run my BMW M3 on 89 octane too.  Not ideal.  

 

I prefer to have ample power for my components to perform at their utmost.  Artificially reducing this by limiting power is a choice one can make I guess. 

 

Not saying you need 1000w for a 3080 but you should at least cover the machines peak usage, no?

 

Edit:  Removed potentially offensive comments, not useful to the discussion.

Quality PSUs stated wattage is not their peak wattage.

So long as the peak is short enough and the caps are large enough, all that happens is caps are discharged to cover the 10ms difference when the circuit is built right.(this is literally a size of the cap issue, not a wattage issue) 

A large misconception with PSU is that suggested wattages ASSUME worst-case scenario PSU quality that tell you the peak wattage, not the sustain 100% 24/7 wattage on the label. Solidly built ones are often rated even lower and will just go to 110% and not care so long as they remain cool. at 115-120, an OCP will trip just for safety reasons of not knowing what is going on on the other side, not because anything wrong is actually happening. 

Its just easier to communicate to a person to spend 20 dollars more on a PSU then to have them call back with issues when they added 2 new 15W fans and it took it just over the edge and dont know why. Its oversimplified and doesn't hurt anything but people who now take those reccomendations and add another 25% of wattage on top of that ("for safety") and are now spending 120 dollars instead of 80 that was recommended or the 60 PSU that actually is necessary. 

[Dedayog]

19 minutes ago, starsmine said:

Quality PSUs stated wattage is not their peak wattage.

So long as the peak is short enough and the caps are large enough, all that happens is caps are discharged to cover the 10ms difference when the circuit is built right.(this is literally a size of the cap issue, not a wattage issue) 

A large misconception with PSU is that suggested wattages ASSUME worst-case scenario PSU quality that tell you the peak wattage, not the sustain 100% 24/7 wattage on the label. Solidly built ones are often rated even lower and will just go to 110% and not care so long as they remain cool. at 115-120, an OCP will trip just for safety reasons of not knowing what is going on on the other side, not because anything wrong is actually happening. 

Its just easier to communicate to a person to spend 20 dollars more on a PSU then to have them call back with issues when they added 2 new 15W fans and it took it just over the edge and dont know why. Its oversimplified and doesn't hurt anything but people who now take those reccomendations and add another 25% of wattage on top of that ("for safety") and are now spending 120 dollars instead of 80 that was recommended or the 60 PSU that actually is necessary. 

Then we can't get pissed at people who don't know what's hidden, can we?

 

Where is the peak output stated on a PSU?  All that info you explained... where does Super Flower list it as well, so we can be informed?

 

If a PSU is a 350w PSU and my components peak at 500w in total... where is explained in the PSU manual or manufacturer website that this is 100% fine and normal, when our number brains go... "oh shit, we're over!!!"?

 

As for adding... with the efficiency curves as they are, putting your peak operating usage into the meat of the curve is optimal, no?  At idle, we use a trickle so it doesn't matter, and if you're past the curve on  a 350w PSU, asking it to push 450w for example... isn't that grossly inefficient?

 

Or are efficiency curves a lie as well?

 

Maybe the issue is just the wording?  Need vs good?  I don't NEED a 850w for my rig, but it's a good idea to put my usage where the efficiency for Platinum is?

 

I think you've got folks on the far left and right arguing, but the majority are going "yeah, 750w is a good purchase" without saying you NEED to have that.

 

1600w for 7800x3d + 7900XTX is overkill, but 350w for a 3080 build is equally ridiculous on the other side.

 

Good discussion, thank you.

[starsmine]

23 minutes ago, Dedayog said:

Then we can't get pissed at people who don't know what's hidden, can we?

 

Where is the peak output stated on a PSU? 

 

If a PSU is a 350w PSU and my components peak at 500w in total... where is explained in the PSU manual or manufacturer website that this is 100% fine and normal, when our number brains go... "oh shit, we're over!!!"?

 

As for adding... with the efficiency curves as they are, putting your peak operating usage into the meat of the curve is optimal, no?  At idle, we use a trickle so it doesn't matter, and if you're past the curve on  a 350w PSU, asking it to push 450w for example... isn't that grossly inefficient?

 

Or are efficiency curves a lie as well?

 

Maybe the issue is just the wording?  Need vs good?  I don't NEED a 850w for my rig, but it's a good idea to put my usage where the efficiency for Platinum is?

 

I think you've got folks on the far left and right arguing, but the majority are going "yeah, 750w is a good purchase" without saying you NEED to have that.

 

1600w for 7800x3d + 7900XTX is overkill, but 350w for a 3080 build is equally ridiculous on the other side.

 

 

No i dont get mad about people who dont know. 
The fact that their PC costs 1200 instead of 1120 really is inconsequential for most people as its a one-time purchase every 5-7 years.

 

The efficiency curves are not a lie no.

They just are not really low at 100% of their label, that's the point of them. They are just as "awful", or sometimes worse efficiency wise at idle where your computer spends 80% of its life. Im not going to calculate that integral of what set up is worse though. This is more important to figure out for fleets then for a single personal PC. 
 

[Bagzie]

On 4/16/2023 at 12:07 AM, tuvok86 said:

650w is absolutely fine, especially with a 5800x3d, I don't know wtf people are smoking.

Finally some sense...

That combination would be doable with 550 watt never mind 650w.

 

OP you are absolutely fine.

[ewitte]

On 11/14/2023 at 5:40 AM, DeerDK said:

Its been 6 months, are we doing this again?

Also, in what world does a 5800x3d + 4070 set up use 650w?

That comment was about the following comment "If you have a 4090 and a 13900K with lots of exotic hardware like water pumps etc, you might need a 1000w psu".  

 

 

[DeerDK]

2 hours ago, ewitte said:

That comment was about the following comment "If you have a 4090 and a 13900K with lots of exotic hardware like water pumps etc, you might need a 1000w psu".  

 

 

You only quoted my old post, so how was I to know that?

But fair enough. No harm done

[cooky560]

It seems comment has raised a bit of a hornets nest, perhaps from people bought a 1000w psu and feel the need to defend their choice. 

 

If you are happy with your purchase, enjoy it

 

PSU efficiency curves often place peak performance at the 60-80% end of the curve, so a system like a 5800x3D with a 4070 will likley net better psu performance from a 650w than a larger psu, assuming that the psu is of reputable quality and a sane design.

[toasty99]

I'm just gonna horrify the PSU snobs here:

 

I ran a Rtx 4070 with a Ryzen 5700 on a 400w Rosewill power supply. Had a single SSD, no hard drive. No rating psu, cheapest junk you can get. I tested it full load with prime 95 and Furmark, it was fine. 

 

Carry on about your arguments as to how a 650w unit cannot possibly manage this. 

[Dedayog]

5 hours ago, toasty99 said:

I'm just gonna horrify the PSU snobs here:

 

I ran a Rtx 4070 with a Ryzen 5700 on a 400w Rosewill power supply. Had a single SSD, no hard drive. No rating psu, cheapest junk you can get. I tested it full load with prime 95 and Furmark, it was fine. 

 

Carry on about your arguments as to how a 650w unit cannot possibly manage this. 

Great proof.  

 

Regardless of what your thoughts are on power supplies, just stating things like this don't help either side.

 

Your attitude just clinches it.  No proof yet cocky and self righteous.

 

100% discounting what you said.