PSU calculators

[AYDANN6ix9ine]

I was wondering how accurate PSU calculators are. Are they accurate or do they overestimate? If they overestimate, by how many watts do they overestimate?

 

I'm using an Oc'ed Ryzen 5 2600X (Likely 4200mhz with 1.4 or lower voltage) and a Oc'ed EVGA GeForce GTX 970 Superclocked (1365 clock- 2053 mempry clock). I'm looking at the Corsair CX550M Semi-Modular 80+ Bronze PSU and want to know if it is enough because calculators say differently.

[LukeSavenije]

Literally not. They say your system needs 500 watts, but it only uses about 300. You're completly fine with with that psu. I run a 8600k 1070 ti with that one

Edited December 15, 2018 by LukeSavenije

[Jurrunio]

PSU calculators overestimate. 2nd gen Ryzen 6 core dont draw more than 150w, while 970 SC is limited to 187w power draw by the vBIOS. Adding other stuff even 450w PSU is sufficient

[fabafaba]

These calculators are mostly BS. Under combined CPU and GPU load my system pulls about 500-550W from the wall, the Corsair calculator estimates 800W

[LukeSavenije]

Just now, fabafaba said:

These calculators are mostly BS. Under combined CPU and GPU load my system pulls about 500-550W from the wall, the Corsair calculator estimates 800W

Well, we have two corsair calculators here. One we call jon, the other one is the website. Only one of them is right

[aezakmi]

5 minutes ago, LukeSavenije said:

Literally not. They say your system needs 500 watts, but it only uses about 300. You're completly fine with with that psu. I run a 8600k 1070 ti with that one

tried a calc once and it said I need a 1300W PSU

 

I think my max load is somewhere around 500 or 550W...

[Turan]

9 minutes ago, AYDANN6ix9ine said:

I was wondering how accurate PSU calculators are. Are they accurate or do they overestimate? If they overestimate, by how many watts do they overestimate?

 

I'm using an Oc'ed Ryzen 5 2600X (Likely 4200mhz with 1.4 or lower voltage) and a Oc'ed EVGA GeForce GTX 970 Superclocked (1365 clock- 2053 mempry clock). I'm looking at the Corsair CX550M Semi-Modular 80+ Bronze PSU and want to know if it is enough because calculators say differently.

You better check your parts in the Pc Part Picker app and take a supply accordingly. If your max load is around 550W, the you should opt for at least 750W PSU. 

[LukeSavenije]

5 minutes ago, aezakmi said:

tried a calc once and it said I need a 1300W PSU

 

I think my max load is somewhere around 500 or 550W...

1300? What could you actually use that for? A 4 crossfire vega 64 with a overclocked treadripper or something?

 

2 minutes ago, Turan said:

You better check your parts in the Pc Part Picker app and take a supply accordingly. If your max load is around 550W, the you should opt for at least 750W PSU. 

That system 550? Not even close. Quality is much more important

[Stefan Payne]

9 minutes ago, AYDANN6ix9ine said:

I was wondering how accurate PSU calculators are. Are they accurate or do they overestimate? If they overestimate, by how many watts do they overestimate?

They are as accurate as the Miles per Gallon the Car Manufacturer claims.

 

So they are not, they are just dumb adder that get their values out of a database. YOU can do the same with adding CPU + GPU TDP (or real power consumption).

[Turan]

1 minute ago, LukeSavenije said:

That system 550? Not even close. Quality is much more important

I don't know how much the power consumptions is, but starting with 750W min is not a bad idea for that kind of system taking into account that efficiency is around 40-70% 750, 850 would be "enough". Overkill 1000-1300W supplies are never bad, though.

[LukeSavenije]

1 minute ago, Turan said:

I don't know how much the power consumptions is, but starting with 750W min is not a bad idea for that kind of system taking into account that efficiency is around 40-70% 750, 850 would be "enough". Overkill 1000-1300W supplies are never bad, though.

You're joking? Only sli setups would need 750+ watts. This system can go on even a 450 watt, as long as it's a good quality one

[aezakmi]

9 minutes ago, LukeSavenije said:

1300? What could you actually use that for? A 4 crossfire vega 64 with a overclocked treadripper or something?

 

That system 550? Not even close. Quality is much more important

pffff not even close.

 

https://outervision.com/b/Yyobu3

[LukeSavenije]

3 minutes ago, aezakmi said:

pffff not even close.

 

https://outervision.com/b/Yyobu3

Freakin 2400 for that? It's a powerhungry system, but I can power it with 850 just fine. We really need a good calculator

[Turan]

8 minutes ago, LukeSavenije said:

You're joking? Only sli setups would need 750+ watts. This system can go on even a 450 watt, as long as it's a good quality one

Overloading an insufficient 450W is far from being efficient. There's no disadvantage of having larger PSU. Using 750W doesn't draw 750W from the wall at all times, it still uses the energy needed and works more efficiently as works around 40-70% area. As it never works at max, the lifetime is usually longer and the price difference is not huge. No reason for 450W PSU and I think they are irrelevant today unless you just use onboard graphics or GT 1030 or something.

[LukeSavenije]

1 minute ago, Turan said:

Overloading an insufficient 450W is far from being efficient. There's no disadvantage of having larger PSU. Using 750W doesn't draw 750W from the wall at all times, it still uses the energy needed and works more efficiently as works around 40-70% area. As it never works at max, the lifetime is usually longer and the price difference is not huge. No reason for 450W PSU and I think they are irrelevant today unless you just use onboard graphics or GT 1030 or something.

You want me to let this get confirmed? A single card systems never uses more than 650 watts, exept if it's treadripper or something. Most systems should rather have a high quality 450/550 watt over a lower tier 750 watt psu. There's nothing wrong with running a higher wattage psu, but in this case we're talking about 40 percent load, which isn't that effecient...

[Rexper]

10 minutes ago, Turan said:

There's no disadvantage of having larger PSU.

Your wallet. And OP may be inclined to buy a cheap, low quality 750w rather than a high quality lower wattage unit.

 

12 minutes ago, Turan said:

and works more efficiently as works around 40-70% area.

No. Idle loads are less than 100w. Browsing the web isn’t much more.

Did you know there are 80+ and ETA certifications designed to assist in choosing efficiency? If you desire efficiency, don’t get caught up in wattage BS...Just choose an efficient PSU.

And you might want to check your math. OPs System would draw an average 285w in game. That’s not even in your 40-70% bracket for 750w PSU.

https://www.techspot.com/review/1410-gtx-970-radeon-390-years-later/page12.html

14 minutes ago, Turan said:

As it never works at max, the lifetime is usually longer

No. Components in a power supply are way overrated. If we’re talking about the same series PSU 750 vs 450w won’t make a difference to lifespan.

What does make a difference to life span is the PSU’s quality. 

[AYDANN6ix9ine]

PC partpicker says my system is 300W. WTF are these calculators.

[AYDANN6ix9ine]

The PSU I'm lookin at is a Certified Refurbished from Corsair power supply with 90-day warranty ($50). I have a bit of concern though. Should I get a new one for $66 or get a CX650M for $76?

[Stefan Payne]

11 hours ago, Turan said:

I don't know how much the power consumptions is, but starting with 750W min is not a bad idea for that kind of system taking into account that efficiency is around 40-70% 750, 850 would be "enough". Overkill 1000-1300W supplies are never bad, though.

You don't know what you're talking about and should read up on your stuff and stop recommending until you read up on it...

 

Efficiency of 40-70%?! What the heck?? Are you livin under a rock?!
Today we call 80% Efficiency crap, PSU are up to 96%! Normal PSU up to like 92-94% (230VAC)

 

And Overkill is bad, because:

https://www.overclock.net/forum/31-power-supplies/944707-why-single-rail-not-better-than-multi-rail.html

Yeah, if that dude had a 500W PSU, the EPS12V Connector wouldn't have burned off the Board. But 1600W is a really great idea if you do not need it - NOT. Especially since most 1000W+ units are way louder than the good 500W units.

 

 

As for Power Con sumption:
You rate your PSU so that it fits your system! If your system consumes 475W, you get a 550W PSU! Not a 1500W.

 

Because PSU are rated for max. OUTPUT Load at rated ambient Temperature - usualy between 40 and 50°C with the good ones.

 

As for Efficiency:
It means the power lost inside the PSU when converting the power.

It does NOT mean that with 80% a 600W PSU can only deliver 480W to the components. That's totally bogus. How can you come up with such nonsense?!

[Stefan Payne]

11 hours ago, Turan said:

Overloading an insufficient 450W is far from being efficient.

Yeah, but we won't be overloading it, dude...

450W is enough for most non OC systems...

11 hours ago, Turan said:

There's no disadvantage of having larger PSU.

Bullshit.

You have higher fan RPM once the fan starts spinning with many designs.

you have more damage when something goes wrong, see above

you have higher cost for something you don't need.

 

Nobody here recomends something like a 750W Bronze unit when you can get a far better Gold one for the same amount of money or less in 450-550W.

 

And you're not seriously recommending the low end 750W Bronze over the 450-550W higher end Gold, are you??

 

11 hours ago, Turan said:

Using 750W doesn't draw 750W from the wall at all times, it still uses the energy needed and works more efficiently as works around 40-70% area.

Yes, and??

How much Efficiency loss are we talking about??

Maybe like 1% or so? Maybe 2 with modern 80plus Gold or better designs...

 

11 hours ago, Turan said:

As it never works at max, the lifetime is usually longer and the price difference is not huge.

Yes and what do you get?? Nothing.

Especially since good units are rated for high ambient anyway, so that they aren't really "loaded at 100%" because that would mean you heat up the room to 40-50°C but then the Components inside the PC would go to shits...

11 hours ago, Turan said:

No reason for 450W PSU and I think they are irrelevant today unless you just use onboard graphics or GT 1030 or something.

You're wrong as 450W is more than enough for most modern mid range systems - all AM4 and up to 80 for nVidia and RX590 for AMD.

 

A 400W is more than enough for a non OC i7-3930K with RX480 (OC; Red Devil)...

 

So why maste money for shit you don't need?!
Because some people who have no idea about PSU told you so?!
The ones that buy mostly crap and not the good ones...

[Stefan Payne]

10 hours ago, AYDANN6ix9ine said:

The PSU I'm lookin at is a Certified Refurbished from Corsair power supply with 90-day warranty ($50). I have a bit of concern though. Should I get a new one for $66 or get a CX650M for $76?

Get a new one because of Warranty...

And get the highest quality. Can't you get a gold one like a Bitfenix Formula?
Or 550TX??

[AYDANN6ix9ine]

Nevermind. A flash sale popped on Amazon and now it is only $50 (technically $55 with tax) so I think I'm going to get that one. Or should I get the CX650M for $60 (technically $60 with tax) or would that be unnecessary and 550W is good enough for the build?

[AYDANN6ix9ine]

Technically $66 with tax