600 Watt PSU for 3080

[Yooghurt]

Hello I'm wondering if a 600 W PSU would be enough for my build longterm,
 

R7 5700X
Thermalright AXP90-X53
ASUS ROG STRIX B550-A GAMING
Crucial P3 (1000 GB, M.2 2280)
Intel M.2 SSD 500 GB from my old pre built
Corsair Vengeance LPX (2 x 8GB, 3200 MHz, DDR4-RAM, DIMM)
I have 6 x 120 MM case fans with RGB

I want the Gigabyte GeForce RTX 3080 Vision OC 10 GB V2 LHR
 

My monitor is going to be 1440p right now I have the Samsung G65B, I also have a XLR Microphone with an interface M-Audio M-Track Solo with Shure SM58
 

Some sites said 600 W would be enough but I still want another opinion

[boaz_n_hoaz]

I wouldn't risk it, I would suggest at least 750W minimum but potentially even 850W to give yourself plenty of room for spikes in power draw. 

[podkall]

I wouldn't recommend it, why so stingy on something that delivers power to your expensive components?

 

 

 

 

 

• You have to understand, 600W PSU, can't efficiently deliver 600W of power
• First there's efficiency tradeoff
• Then, there's other parts that need power too
• Your CPU needs 65W+ for instance
• PSU's protections trip and power off when they exceed their rating - if they work properly
• Even if it's not as likely and as often for the 3080 to approach 500W during it's transients, you're seeing that you barely have 100W of headroom
• And that's considering PSU works at 100% efficiency, which it doesn't

[seon123]

7 minutes ago, podkall said:

You have to understand, 600W PSU, can't efficiently deliver 600W of power

If you've actually seen the efficiency "curve" of a PSU, it's a nearly vertical line from 0-100W, and then a nearly straight, horizontal line to 110%. mUh EfFiCiEnCY cUrVe is not real. 

 

9 minutes ago, podkall said:

And that's considering PSU works at 100% efficiency, which it doesn't

In your mind, how do you calculate the output wattage of a PSU?

 

 

 

24 minutes ago, Yooghurt said:

Hello I'm wondering if a 600 W PSU would be enough for my build longterm,

With a 3080, you should get a good 750W PSU, if it's  a PSU that lacks multi rail OCP, as the transients from 3000 series GPUs can be quite large, meaning it can draw far more than the average power needed, for short periods of time.

 

The emphasis is on "good". Don't just get a random cheap 750W 80+ Gold rated PSU recommended by LTT labs, all of that's pretty much meaningless, and doesn't tell you that a PSU is any good. If you want recommendations for a PSU, those will depend on where you're buying from, as the prices and availability will vary, and so will any meaningful recommendations. 

[OddOod]

Will it work? Probably. Do make sure to get a high tier PSU (PSU Tier List) if you go this inadvisable route.
Will it last? Almost certainly not. You will be right up against the edge of the performance limit and thus as the PSU degrades (as all do over time and especially with use)
When it dies will it hurt your components? *Hopefully* no. Most reputable PSU manufacturers do a pretty solid job of protecting the rest of the computer when they die, but the interesting thing about failsafes is sometimes they fail to fail safely. 
Should you get a UPS? Absolutely. It will likely extend the life of your PSU and you should get one regardless of the PSU you go with. 1500VA range is what I'd recommend

[podkall]

11 minutes ago, seon123 said:

In your mind, how do you calculate the output wattage of a PSU?

-10%?

 

12 minutes ago, seon123 said:

If you've actually seen the efficiency "curve" of a PSU, it's a nearly vertical line from 0-100W, and then a nearly straight, horizontal line to 110%. mUh EfFiCiEnCY cUrVe is not real. 

if you mean that 600W PSU goes out of it's way to deliver 600W but draw about 650W from the wall, then sure,

 

but even then I wouldn't recommend less than 750W PSU for a RTX 3080 regardless of my very fast math and overlapping terms that may be sometimes wrong.

[podkall]

9 minutes ago, OddOod said:

Should you get a UPS? Absolutely. It will likely extend the life of your PSU and you should get one regardless of the PSU you go with. 1500VA range is what I'd recommend

I don't know about UPS, if you get UPS that has headroom for shutting off the PC, you're already in high enough budget to just straight up buy a good PSU with headroom.

[PDifolco]

1 hour ago, Yooghurt said:

Hello I'm wondering if a 600 W PSU would be enough for my build longterm,
 

R7 5700X
Thermalright AXP90-X53
ASUS ROG STRIX B550-A GAMING
Crucial P3 (1000 GB, M.2 2280)
Intel M.2 SSD 500 GB from my old pre built
Corsair Vengeance LPX (2 x 8GB, 3200 MHz, DDR4-RAM, DIMM)
I have 6 x 120 MM case fans with RGB

I want the Gigabyte GeForce RTX 3080 Vision OC 10 GB V2 LHR
 

My monitor is going to be 1440p right now I have the Samsung G65B, I also have a XLR Microphone with an interface M-Audio M-Track Solo with Shure SM58
 

Some sites said 600 W would be enough but I still want another opinion

I won't risk it, it may work "most of the time" but as the 3080 has transient spikes up to around 500W it'll trip off regularly

 

[Agall]

57 minutes ago, seon123 said:

If you've actually seen the efficiency "curve" of a PSU, it's a nearly vertical line from 0-100W, and then a nearly straight, horizontal line to 110%. mUh EfFiCiEnCY cUrVe is not real. 

Most of the efficiency curves I see peak between 50-65%, which is my objective for steady state power draw. It'll usually provide enough headroom for peak draws too.

[seon123]

2 hours ago, podkall said:

-10%?

 

if you mean that 600W PSU goes out of it's way to deliver 600W but draw about 650W from the wall, then sure,

 

but even then I wouldn't recommend less than 750W PSU for a RTX 3080 regardless of my very fast math and overlapping terms that may be sometimes wrong.

A 600W PSU means it can output 600W. The efficiency just tells you how much additional power is wasted by the PSU to output that wattage. You can typically expect a PSU to output about 30% above its rated power before the OPP trips. That said, due to the transients from the 3000 series, I also recommended 750W. 

 

1 hour ago, Agall said:

Most of the efficiency curves I see peak between 50-65%, which is my objective for steady state power draw. It'll usually provide enough headroom for peak draws too.

The efficiency barely changes between 50% and 100% load. E.g. the A750GL (a random PSU) is most efficient at 40% load, at 90.9%. At 100% load, it's at 87.0%. At a 400W load (approximately the average power consumption for a 3080 PC under a gaming load) that is the difference between pulling 440W and 460W.

 

It makes more sense to choose the PSU wattage based on what will work for the components, than to aim for some target based on what would maximise the efficiency. 

[Agall]

28 minutes ago, seon123 said:

It makes more sense to choose the PSU wattage based on what will work for the components, than to aim for some target based on what would maximise the efficiency. 

Why my 50-65% target is more than just efficiency, its also usually a good spot to provide enough headroom for peak loads and a future ~10% reduction in maximum output after 5 years. I haven't seen a reason to get away from that stance in the last 5 or so years either.

[Bagzie]

2 hours ago, Agall said:

Most of the efficiency curves I see peak between 50-65%, which is my objective for steady state power draw. It'll usually provide enough headroom for peak draws too.

To be fair whether it's at 92% efficiency or 90% efficiency is largely irrelevent.

 

That being said OP should be looking at 750w psus.

[Agall]

36 minutes ago, Bagzie said:

To be fair whether it's at 92% efficiency or 90% efficiency is largely irrelevent.

 

That being said OP should be looking at 750w psus.

 

20W is 20W. More like high 80%'s versus low 90%'s if we're talking in the 750W draw range. That power being consumed by a part without the best thermodynamic characteristics, being the power supply. Can start to matter in the long run or if you're getting another 20W of draw over years.

 

One of those "why not" if you know about it and can do it.

 

 

Depending on the design, it can vary greatly though:

 

 

 

[podkall]

2 hours ago, seon123 said:

You can typically expect a PSU to output about 30% above its rated power before the OPP trips.

If they work and are calibrated correctly

2 hours ago, seon123 said:

A 600W PSU means it can output 600W. The efficiency just tells you how much additional power is wasted by the PSU to output that wattage.

I wonder if efficiency has any effect on power delivery when the demand shifts or consistency.

[Motifator]

3 hours ago, podkall said:

I wonder if efficiency has any effect on power delivery when the demand shifts or consistency.

It has when the situation is a "hot box", where the PSU is tortured towards hot temps in a not so well ventilated condition. In which case a more efficient PSU would be outputting less heat into the case, meaning it heats up less. A cooler functioning PSU is better in the longest runs.

[Bagzie]

5 hours ago, Agall said:

 

20W is 20W. More like high 80%'s versus low 90%'s if we're talking in the 750W draw range. That power being consumed by a part without the best thermodynamic characteristics, being the power supply. Can start to matter in the long run or if you're getting another 20W of draw over years.

 

One of those "why not" if you know about it and can do it.

 

 

Depending on the design, it can vary greatly though:

 

 

 

Your first graph is 92% vs 90%.

 

Your worst case scenario is not that much worse either.

 

But this is all redundant because a 5700X + 3080 is going to be sitting at 400w or so most of the time.

 

There's many reasons to not use a 600w psu with that combination but efficiency isn't one of them.

[podkall]

7 hours ago, Bagzie said:

Your first graph is 92% vs 90%.

 

Your worst case scenario is not that much worse either.

 

But this is all redundant because a 5700X + 3080 is going to be sitting at 400w or so most of the time.

 

There's many reasons to not use a 600w psu with that combination but efficiency isn't one of them.

efficiency becomes more relevant when you consider cheapest solutions, since running something high end on efficient PSU vs non-efficient can print itself on the electricity bill, especially the longer the machine stays on and the longer the machine is boosting it's performance

[Bagzie]

12 hours ago, podkall said:

efficiency becomes more relevant when you consider cheapest solutions, since running something high end on efficient PSU vs non-efficient can print itself on the electricity bill, especially the longer the machine stays on and the longer the machine is boosting it's performance

I think you missed my point about the 3080+5700X sitting in the efficiency spot at 400w most of the time.

 

A 3080+5700X is not a 600w combination in the real world.

 

Don't think anyone cares about a 2% efficiency gain in the 20ms window of transient spikes , that would be a bit extreme.

[NobleGamer]

On 9/11/2024 at 10:55 AM, Yooghurt said:

Hello I'm wondering if a 600 W PSU would be enough for my build longterm,
 

R7 5700X

I want the Gigabyte GeForce RTX 3080 Vision OC 10 GB V2 LHR

I have nearly the same general build, but with a 5600X, and my power draw at the outlet when gaming at 100% GPU is 520W - Not including transient spikes. So 600W is playing Press Your Luck, but 700-750W would be good, though I personally have a Corsair RM850x for near passive & cool when not gaming.

 

4 hours ago, Bagzie said:

I think you missed my point about the 3080+5700X sitting in the efficiency spot at 400w most of the time.

 

A 3080+5700X is not a 600w combination in the real world.

Given numbers above, I agree if GPU is not at 100% the whole time, and yeah it can't reach 600W unless maybe doing manual OC on both parts.