Power Supply 3080 and 5950X on 500W PSU, can it be done?

[Lucas]

Hi,

I am trying hard to beat the competition when it comes to performance per liter. Thus I need a small PSU. The smallest high powered PSU I've found so far is the silverstone fx500W. Hope is to have it watercooled and case below 6L.

I am aware of Nvidias recomendation of 750W, although I do not think that is needed from my own research so far. I'm planning on undervolting both the CPU and GPU a notch.

 

[Goatee]

You can get 600w flex PSU's. ENP-7660B is one of the models.

 

[Lucas]

You can get 600w flex PSU's. ENP-7660B is one of the models.

I looked at that one earlier, but I saw the noise was horrible in the graphs, but I recon that is just a fan-change away. Also it is a 0.5 year warranty, most PSUs have 6-10 years.

 

[Goatee]

I looked at that one earlier, but I saw the noise was horrible in the graphs, but I recon that is just a fan-change away. Also it is a 0.5 year warranty, most PSUs have 6-10 years.

@REVOCCASES has some adaptors that may meet your need. He is likely able to give you some info on those PSU's too.

 

[Skripka]

Can it be done?....maybe. It depends on how heavily you underpower and undervolt the hardware; but also on how much ancillary equipment needs power. Not just SSDs or mice/keyboards. You're in such a precarious power budget position that even the motherboard PCH's and fan power needs thought about....also I wonder about power spikes that happen with GPU loads. The CPU you can run in ECO mode, and leave a pile of performance on the table doing it.

Presuming you can pull it off, you'll still be running your PSU very hard.

 

[Lucas]

@REVOCCASES has some adaptors that may meet your need. He is likely able to give you some info on those PSU's too.

Thanks.

Looking at the specs, the 3080 at stock peaks at max at 350W, the 5950X wouldprobably peak at 120W for a total of 470W.
Although with some undervolting, with no performance loss, I could probably get the 3080 down to 270W peak and 5950X to 100W peak.

 

[Lucas]

Can it be done?....maybe. It depends on how heavily you underpower and undervolt the hardware; but also on how much ancillary equipment needs power. Not just SSDs or mice/keyboards. You're in such a precarious power budget position that even the motherboard PCH's and fan power needs thought about....also I wonder about power spikes that happen with GPU loads. The CPU you can run in ECO mode, and leave a pile of performance on the table doing it.

Presuming you can pull it off, you'll still be running your PSU very hard.

Thanks for your reply, as stated above I've looked at peak-spikes from GPU benchmarks. My hope was to only undervolt so I do not lose any performance. I do not want to sacrifice performance here. If there were only a 700W in that size, or even a 650W. Would be insane with a sub 6L 3080/5950X though

 

[Skripka]

Thanks for your reply, as stated above I've looked at peak-spikes from GPU benchmarks. My hope was to only undervolt so I do not lose any performance. I do not want to sacrifice performance here. If there were only a 700W in that size, or even a 650W. Would be insane with a sub 6L 3080/5950X though

IIRC, OptimumTech was able to get his 3080 down to 280W or so without losing much performance. But that is silicon lottery.

The 5950X, presuming AMD's statements of power not changing are accurate to bank on...Well the 3950X is 105W at base clock full load AKA 3.5gHz; and 150W at boost clocks ("up to 4.7gHz) using the Matisse boost logic and freq/voltage parameters. But, I'd be surprised if AMD hasn't changed the PB/PBO logic at all--and I'd hope they're better optimized.

 

[REVOCCASES]

If you are looking for the best PPL power solution you should join G-unique's Discord and look for G-stick 18.

 

[Bubba]

In Afterburner, the power limit can be set as low as 58%.
58% of 350 watts (peak) = 203 watts
Or save some money by buying a RTX 3070 or used 2080 Ti.

 

[Lucas]

IIRC, OptimumTech was able to get his 3080 down to 280W or so without losing much performance. But that is silicon lottery.

The 5950X, presuming AMD's statements of power not changing are accurate to bank on...Well the 3950X is 105W at base clock full load AKA 3.5gHz; and 150W at boost clocks ("up to 4.7gHz) using the Matisse boost logic and freq/voltage parameters. But, I'd be surprised if AMD hasn't changed the PB/PBO logic at all--and I'd hope they're better optimized.

Yeah, there will be some lottery. Right now I have a case design for fully watercooled 3080 with 5950X in less than 5L. Sadly I realise there will be no 3080 for me to use in the next months.

If you are looking for the best PPL power solution you should join G-unique's Discord and look for G-stick 18.

Thanks, where do I find that channel? I am not using discord much.

In Afterburner, the power limit can be set as low as 58%.
58% of 350 watts (peak) = 203 watts
Or save some money by buying a RTX 3070 or used 2080 Ti.

I could save some money buying 3070, which was my initial idea, but getting a 3080/5950X workstation in a case of sub 5L would be amazing. Else I gotta stick with the 3070. Nontheless I have some months refining my ideas as there wont be much of 3000-series on the market...