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I have rather low knowledge about electricity and PSU so I'd ask here :) If I run 6 GPU's which draw 750 watts from wall using gold standard PSU, will the draw get lower if I install platinum PSU ? If so should the difference be good enough to justify 25-40 euro higher PSU price?

Some quick calculations, tried to keep it simple so no efficiency curves etc.

750W load - 88% PSU - 852W at wall
750W load - 90% PSU - 833W at wall
750W load - 92% PSU - 815W at wall
750W load - 94% PSU - 798W at wall

Conclusion:

If the price difference is only 20-40€ go platinum.

Dwarpool more than 6 hours and no block.
I think it is better win less money on flypool...

https://en.wikipedia.org/wiki/80_Plus

and it depends on your electricity price.
Also if better efficiency - less heat

Yes, it is well worth it if you go with a name brand (Corsair, eVGA) as some of those PSUs now carry 10-year warranties. If you plan to mine long-term you will more than get your money back. I have also been watching Titanium supplies (when they go on sale) as they can get close to 96% efficiency when fed with 240V, which expanding on the above chart would be:

750W load - 96% PSU - 781W at wall

The price premium is currently pretty high so you need to catch these on sale, but it is getting to the point where the PSU is becoming almost transparent as far as additional power consumption. With a 70W difference between the most (Titanium) and least (Bronze) efficient models, at $0.10 power this can be up to a $60/yr savings, so looking at a 10 year life span this would equate to a $600 savings, I think it will more than pay for itself.

Just calculate price difference for electricity consumption let's say for 1-2 year and psu cost. Also, it's important to compare apples to apples, so it should be the same brand psu.

About 10-year warranties in some countries it's just a scam. You have to send broken unit to US or HK and pay for fedex or dhl yourself. So using in your calculations 10 year does not make sense.

no it's only 2% the difference in efficiency, you will save something like 50 euro a year, not worth it unless the price is very akin

Plats and golds can have huge difference.

Let's say you pull 750 watts on a 1000 watt psu.

If you take ten 1000 watt golds and ten 1000 watt plats

They can be 6% different in power .

And depending on sales and deals

Sometimes a good 1000 watt plat can be low cost .

The 1000 watt rosewill quark was on sale,for 110 usd at newegg.

A solid plat psu with a good warranty


 jonnyguru.com  gave it a solid review and if you can get it for 110 usd and plan to draw 750 watts

It is a no brainer to buy it over a gold 1000 watter

110 usd for 1000w platinum is a great price, thx for the tip.  :)

One thing to keep in mind when buying PSU, if you already have tons of modular cables and PSU's laying around it helps if they have same pinouts. Even same manufacturer can use different pinouts depending on product line.

At some point I thought it was a standard but it isn't, I am lucky I only burned one cheap old ssd.

it depend on the model really, my rm1000i sit at 91% efficiency all the time(some times even 92%) and it's gold, a platinum can only do 93%-94% and titanium 95%-96%

2-3% maximum will not make a big difference, because you are saving like 300watt a day...

Exactly this.  

Some gold 1000 watt psu's are very good at 750 watts
Some plat 1000 watt psu's are very bad at 750 watts

or flip flop that.  so  6% is max savings  and 6% of 750 = 45 watts x 24 = a kwatt  a day max savings in power and that  about 10-15 cents a day best case

 worst case 1-5 cents a day  so  3.65 usd a day at worst  and maybe 55 dollars at best.

but your pricing of the psu is key
a 1000 watt plat for 109.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817182353&cm_re=quark-_-17-182-353-_-Product

a 1000 watt gold for 169.99
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139139&cm_re=rm1000i-_-17-139-139-_-Product


review on the Quark 1000 watt plat

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story&reid=435

At 800 watts it does 90.7%  plat machine

below  the review for the corsair rm1000i gold machine
https://www.techpowerup.com/reviews/Corsair/RM1000i/

and it rates 91.87%  at 799.44 watts  see this page


https://www.techpowerup.com/reviews/Corsair/RM1000i/5.html

so in this case the gold rates better then the plat.


another review on the  plat quark  shows it to not do as well as the gold corsair

http://www.tomshardware.com/reviews/rosewill-quark-1000-power-supply,4173-4.html


but at 110 for the quark and 169 for the corsair

I buy the quark

I also want to ask because my knowledge about this one is not as good as I wanted it to be
Any advice would be much appreciated about PSUs the supplier bought for us,
I use Zalman 700w 80+ (http://www.zalman.com/contents/products/view.html?no=96)
for 3x RX480 8G, some of them are modded on 230h/s some of them are not 185h/s
They randomly freeze from time to time, I suspect it's PSU problem, I just need someone to confirm this thanks

Just a reminder, what OP actually asked:


Funny, in PSU thread 20W is nothing when at the same time it is matter of life and death in GPU thread.

1 psu vs. 6 GPU it's not 20w vs. 20w

Jonnyguru also mentioned the sleeve-bearing fan in the thing, which IMO makes this not only a bad idea, but a "hell NO don't even bother looking at it" failure.

 Seems like a good unit otherwise, too bad they went BLOODY CHEAP on the fan.




 Where I'm at, a kilowatt saved a day amounts to about $1 - which makes it VERY HARD to justify the higher price on same-quality Plat supplies vs Gold.
 It's even harder when my "go-to" supplies are Seasonic X-series Golds that *barely* miss Plat efficiency in the first place.
 (JohnyGuru at one point had the Seasonic X1250 as their highest-rated PS - not sure if that's still the case, I think I remember them loving the Seasonic Snow even more and the EVGA 1300 G2 about as much)

 I've got VERY low electric costs though - if you're paying 10c/kwh and more it's a LOT easier to justify the higher outlay.

I don't know about other countries, but in the US it is definitely NOT a scam. In fact within the past 6 months I sent in two Corsair PSUs that I had that were about 4 years old, and they would randomly reboot the rigs they were in. These were 850W TX units which Corsair doesn't make anymore and in about 8 days turnaround time I had two brand new RM850x fully modular replacements. Cost me $20 in shipping for both, so I do value a long warranty.

As far as the calculations, it of course varies on the exact efficiency, power costs, etc, but even that $0.15 cent a day saving so many of you are poof-poohing, it still adds up to $54.75/yr. So even at only 4 years it would be nearly a $200 savings. I think spending an extra $40-$60 upfront is worth the extended payback.

  fans are easy fixes and i mount the rosewills with fan pointed to the sky which effectively 2x the life.

8 days would kill me, I am used to 0-1 days. Plat extends your warranty from 3 to 5 years here.

IF it is only 20-60 more I would go for it. I am running only golds here, plats were not on sale when I went to panic buy some PSU's ))

low quality

52.5 amp is max  for 12 volts  that  is 630 watts  and you can not do that 24/7


http://www.zalman.com/contents/products/view.html?no=96

2 b sure  run 2 rx 480s  not 3 and see what happens,


http://www.realhardtechx.com/index_archivos/Page1530.htm

630 watt max  wont cut it.

 you are pushing at 230h/s  so they pull more power

where do you live I may be able to find a good link for a psu for you.

 Fans are easy fixes *IF* you catch the dead fan BEFORE the overheat kills the PS or in some cases the PS AND other components in the rig.

 Again, it depends a lot on your electric cost.

 To "save" $1 a day for me would take a jump to TITANIUM power supplies from my current Golds - and would involve a few THOUSAND in outlay given how many PS I'd have to replace and their sizes.
 If I moved my entire farm to Plat from Gold I'd only save 50-60 cents a day *IF* I was paying going rates for this area (I'm currently on a flat-rate contract) - presuming I could find Plat supplies that actually managed 2% better efficiency than my current almost-all-Seasonic mostly-X-series horde of supplies (Seasonic X-series are some of the most efficient Gold-rated on the market, and come bloody close to Plat efficiency in actual usage).

 I also prefer the security of using a known very high quality lasts bloody near forever supply from a manufacturer with a VERY high reputation earned over a very long time, for *THAT* I'm willing to pay somewhat of a premium. The well above average efficiency is a nice little bonus.



 For folks with electric rates on the high side of 10c/KWH it's a lot easier to justify going with good Platinum supplies over good Fold supplies.
 At under 5c it's VERY tough to do so.

OK hard data:

I have 2 exactly same rigs, each 6 GPU rx 470 Nitro,  the only difference is PSU

1st has corsair 1000x - it is gold
2nd has corsair HX1000i - it is platinum

Power draw from 1000x is actually a little bit lower. It is only 5 Watt, but what is most important there platinum isn't any better... Is corsair platinum not the best choice when it comes to mining as efficient as possible? When I compare graphs of those 2 PSU, the looks exactly the same, or at least I can't see any difference.

You still need to try plat on rig1 and gold at rig2, then it is really hard data.