450W or 650W psu?

[gloop]

Just now, warmongerp said:

A system with  Ryzen7 2700X with a GTX 1660 super can very well pull +400 watts under FULL load with very little effort without any bells and whistles.

How much does my 2700x and 5700xt pull then?

[Spotty]

22 minutes ago, SecertlyHappy said:

450W 80+ gold corsair SFX psu and 600W 80+ gold corsair psu is what I am looking at the moment. There is a 60 dollar difference in price, so asking to see. If I can save the money, I could just buy the 450W psu.

The SF450 would be fine for your build, but if you're planning on upgrading to like a 2080ti or a high powered GPU like that then take the SF600.

[warmongerp]

1 minute ago, gloop said:

How much does my 2700x and 5700xt pull then?

A system is not only a CPU and GPU as you are well aware.

 

What is your full system? Including rgb, hardrives, fans, pcie devices? 

[gloop]

2 minutes ago, warmongerp said:

A system is not only a CPU and GPU as you are well aware.

 

What is your full system? Including rgb, hardrives, fans, pcie devices? 

2700x, Wraith Prism, B450 Tomahawk Max, 32GB 3000MHz, 500GB M.2 + 1TB 5400RPM, 5700XT, H510, RM550x, 3 PWM Fans. 
 

If you need it, 2700x is PBO enabled, RAM has +266Mhz and tightened timings, and 5700xt is overclocked to 2050 core and 1750 mem. 

[Mateyyy]

17 minutes ago, warmongerp said:

1 fan can draw 6/7 watts

Silent Wings 3 120mm PWM:

 

NF-A12x25 PWM:

[warmongerp]

2 minutes ago, gloop said:

2700x, Wraith Prism, B450 Tomahawk Max, 32GB 3000MHz, 500GB M.2 + 1TB 5400RPM, 5700XT, H510, RM550x, 3 PWM Fans. 

You PSU is actually pretty well balanced for your system, on absolute torture benchmarking your system can draw about 460/70 watts so 100 watts buffer is pretty nice but usually the average is much lower even better.

 

I always go for worst case scenario for PSU recommendation and that should be the norm.

[warmongerp]

1 minute ago, Mateyyy said:

Silent Wings 3 120mm PWM:

 

NF-A12x25 PWM:

That's not your average fan that you find on your average computer, again, assume the worst.

[Mateyyy]

4 minutes ago, warmongerp said:

That's not your average fan that you find on your average computer, again, assume the worst.

..Arctic P12 PWM, which costs $8 or thereabouts:

 

From 0.96/1.44/1.68W all the way up to 6-7W, there's quite the gap.

[warmongerp]

5 minutes ago, Mateyyy said:

..Arctic P12 PWM, which costs $8 or thereabouts:

 

From 0.96/1.44/1.68W all the way up to 6-7W, there's quite the gap.

...Seems you are not reading.

 

Quote

That's not your average fan that you find on your average computer, again, assume the worst.

There are molex fans that can take up to up 6 watts.

 

Your best case scenario is just that: yours.

 

You shouldn't assume what other people fans are much less assume your best case scenario is helping anyone with recommendations.

 

[Jeppes]

I just love Gamers Nexus. No need to argue vs ignorant people

 

 

[Mateyyy]

Just now, warmongerp said:

...Seems you are not reading.

 

There are molex fans that can take up to up 6 watts.

 

Your best case scenario is just that: yours.

 

You shouldn't assume what other people fans are much less assume your best case scenario is helping anyone with recommendations.

I mean you were previously assuming that OP is going to throw in who knows how many hard drives in their system, when they clearly mentioned that they're putting together a small ITX build lol

[Ralf]

1 hour ago, warmongerp said:

That's not your average fan that you find on your average computer, again, assume the worst.

 

1 hour ago, warmongerp said:

...Seems you are not reading.

 

There are molex fans that can take up to up 6 watts.

 

Your best case scenario is just that: yours.

 

You shouldn't assume what other people fans are much less assume your best case scenario is helping anyone with recommendations.

 

There are some 50W+ Delta fans out there, assume the worst.

[mariushm]

A 2700x will go up to 100-120 watts from the 12v output. 

A GTX 1660 Super will consume up to around 110 watts, but for safety let's say 125 watts from the 12v output

The motherboard will consume around 10-20 watts (chipset, onboard audio, network, usb ports powering mouse and keyboard) ... a mix of mostly 3.3v and 5v

ram sticks will consume maybe 2-3 watts each, usually powered from 5v

fans will consume up to 2-3 watts each 

A ssd will consume an average of 1-3 watts when idle or reading files, maybe goes up to 5-6w when writing data for long periods of time (tens of seconds) ... ssds take power from 5v 

A mechanical drive uses around 6-10 watts, half from 5v for the circuit boards, around half for the motor from 12v 

 

So you need a power supply that can provide at least 120+125+25  + some margin = around 300 watts on 12v. 

 

A 450w power supply should be able to output at least 380-420 watts on 12v, so you should have around 20-30% of room for upgrading if desired. 

 

A 5700XT will pull up to around 250w for brief moments, and will stay up to around 220 watts most of the time, if you go with this you should go with more than 450 watts. 

 

Even though 450w would be plenty, you may want to go with a higher wattage psu with the idea that such psu would either have a better fan, or it would have better or more components and therefore be less noisy.  For example, the 450w and 600w models may be same circuit board, same design, but the 450w may use only 4 mosfets in parallel (parts of circuit which produces the 12v) and the 600w may have 6 or 8 mosfets in parallel. 

 

Even though your computer consumes only 300w,  the losses resulted from producing 12v would be spread across 6-8 mosfets that use a larger area compared, and therefore the heat transfer from mosfets to heatsink is better,  so a fan may need to move less air (spin slower, less noisy) to move the heat from the heatsink to the outside of the psu case.

 

Is it worth the 60$ extra... I'd say in your case no, but I'd look at other models and maybe I'd try to find a 550w psu, even if it's only bronze rated. It won't be a big deal if your psu is only bronze rated, it just means it will produce a bit more heat. 

[mariushm]

14 hours ago, Ralf said:

 

There are some 50W+ Delta fans out there, assume the worst.

Yeah, the average fan is gonna consume 2-3 watts at most. 

He's unlikely to put a 50w fan in an ITX build ... such a fan would probably blow so hard components would probably be ripped off the motherboard.

 

There's 100+ watts fans, designed for servers or for locations where you need pressure ... for example https://digikey.com/en/products/detail/sanyo-denki-america-inc/9CRB0812P8G001/6928157

 

 

or if you want airflow, there's 85 watts fans like this 120mm one https://www.digikey.com/en/products/detail/sanyo-denki-america-inc/9CR1212P0G03/6191008

 

 

 

Both are f...ing noisy though...