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Is this peak or continuous wattage?

Go to solution Solved by bellabichon,

The 700W rating is supposed to be continuous, but whether or not the unit is actually able to maintain that will depend on the quality of the power supply. 

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someone in reddit says this but i dont get what he said is this peak or continuous?

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Normally a pc psu will only show continuous power, not peak in the ratings.

 

The reddit post is about distribution amount the rails.

 

 

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The 700W rating is supposed to be continuous, but whether or not the unit is actually able to maintain that will depend on the quality of the power supply. 

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Got any questions about my system or peripherals? Feel free to tag me (@bellabichon) and I'll be happy to give you my two cents. 

 

PSA: Posting a PCPartPicker list with no explanation isn't helpful for first-time builders :)

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Like others said, your power supply says it can output 700W continuously. It can output at most 696W out of 700W on the 12V rail, which is used the most by computer components.

 

The post on reddit is needlessly confusing to you. It points out that some very cheap power supplies have much lower limits on the 12V rail, which makes them less useful for modern computers. If your computer consumes 350W from the 12V voltage and 50W from 5V&3.3V voltages, then it wouldn't be able to be powered from a 500W PSU which is rated for 300W on 12V and 200W on the other voltages.

 

The post from reddit is wrong in this part, which is very often a source of confusion on how power supplies are rated:

    "EVGA G2 550w as an example. It has 45.8 amps on the 12V rail. It comes out to 549w. This power supply can output 549w."

 

The last part is wrong - the EVGA can output 550W. A 500W PSU rated for 300W on 12V and 200W on other rails is not a 300W PSU, it's a 500W PSU. Even a hypothetical 500W PSU rated for 5W on 12V and 495W on other rails is not "a 5W PSU", it's a 500W PSU - despite being useless for all computers.

By the same logic, my phone charger is a 0W PSU because it doesn't have a 12V rail at all.

 

Power supplies with 12V rails rated for much lower power than their total power are bad and something you should be wary of, but too many people take it too far, look at a 500W PSU with a 300W 12V rail, and say "this is a 300W PSU!". They should instead say "your computer would only have access to a little over 300W out of this 500W PSU, and wouldn't be able to use much of the remaining 200W".

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Then there is the curve ball:

 

Output at a certain temperature, then it will drop.

 

So it really does matter what the PSU is, and how it's rated and what it is rated at.

 

Some PSUs are only rated at 30C while others are rated at 40C or 50C.

 

And still some PSUs even rated at 50C will drop their output at 40C by a certain percentage. 

 

So the quality of the PSU DOES MATTER.

i9 9900K @ 5.0 GHz, NH D15, 32 GB DDR4 3200 GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q 27", Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W Titanium. 

 

i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV DDR4 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.

 

i7 8700K, AORUS Z370 Ultra Gaming, 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.

 

 

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9 hours ago, Ankerson said:

Then there is the curve ball:

 

Output at a certain temperature, then it will drop.

 

So it really does matter what the PSU is, and how it's rated and what it is rated at.

 

Some PSUs are only rated at 30C while others are rated at 40C or 50C.

 

And still some PSUs even rated at 50C will drop their output at 40C by a certain percentage. 

 

So the quality of the PSU DOES MATTER.

im planning to buy this psu is this good? https://shopee.ph/EVGA-Power-Supply-500BV-watts-80plus-Bronze-i.77398075.1325235503 my build is only around 450 watts so it should be enough in terms of watts but i dont know about its quality

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10 hours ago, Ankerson said:

And still some PSUs even rated at 50C will drop their output at 40C by a certain percentage. 

Seasonic? That's just marketing bullshittery of how they advertise their temperature rating. The prime units for example are advertised as rated for 50°C, but only up to 80% load. They're only rated for 40°C at 100% load. 

 

10 hours ago, OrionFOTL said:

Power supplies with 12V rails rated for much lower power than their total power are bad and something you should be wary of, but too many people take it too far, look at a 500W PSU with a 300W 12V rail, and say "this is a 300W PSU!". They should instead say "your computer would only have access to a little over 300W out of this 500W PSU, and wouldn't be able to use much of the remaining 200W".

I must admit I'm guilty of doing that sometimes. I guess it's just easier to get the point across to someone who doesn't understand power supplies at all and could be easily overwhelmed with too much information when you start explaining the different voltages and such. Though, your explanation there does seem very easy to understand.

 

There are also power supplies that just lie. They'll be labelled as "850w" and "total output 850w" then have 400w on 12v and 100w on 5v & 3.3v. 

Such as this...

 

CPU: Intel i7 6700k  | Motherboard: Gigabyte Z170x Gaming 5 | RAM: 2x16GB 3000MHz Corsair Vengeance LPX | GPU: Gigabyte Aorus GTX 1080ti | PSU: Corsair RM750x (2018) | Case: BeQuiet SilentBase 800 | Cooler: Corsair H100i AIO | SSD: Samsung 970 Evo 500GB + Samsung 840 500GB + Crucial MX500 2TB | HDD: Seagate Ironwolf 8TB + 2x Seagate Ironwolf 6TB | Monitor: Acer Predator XB271HU + Samsung BX2450

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43 minutes ago, ninjaboyxd629 said:

im planning to buy this psu is this good? https://shopee.ph/EVGA-Power-Supply-500BV-watts-80plus-Bronze-i.77398075.1325235503 my build is only around 450 watts so it should be enough in terms of watts but i dont know about its quality

 

I would recommend going with their BQ model really if you are going with a budget model.

i9 9900K @ 5.0 GHz, NH D15, 32 GB DDR4 3200 GSKILL Trident Z RGB, AORUS Z390 MASTER, EVGA RTX 3080 FTW3 Ultra, Samsung 970 EVO Plus 500GB, Samsung 860 EVO 1TB, Samsung 860 EVO 500GB, ASUS ROG Swift PG279Q 27", Steel Series APEX PRO, Logitech Gaming Pro Mouse, CM Master Case 5, Corsair AXI 1600W Titanium. 

 

i7 8086K, AORUS Z370 Gaming 5, 16GB GSKILL RJV DDR4 3200, EVGA 2080TI FTW3 Ultra, Samsung 970 EVO 250GB, (2)SAMSUNG 860 EVO 500 GB, Acer Predator XB1 XB271HU, Corsair HXI 850W.

 

i7 8700K, AORUS Z370 Ultra Gaming, 16GB DDR4 3000, EVGA 1080Ti FTW3 Ultra, Samsung 960 EVO 250GB, Corsair HX 850W.

 

 

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