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Extreme.outervision.com psu calc, what wattage does it show?

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February 2, 2013 9:58:40 AM

http://www.extreme.outervision.com/psucalculatorlite.js...
when you enter the system data it shows you 2 watt informations the lower and higher.
the higher one is the recommended psu wattage you should look for or is it just the real wattage so lets say 82% from 100%?

thank you
revro
Anonymous
a b ) Power supply
February 2, 2013 10:11:02 AM

the higher is recommended so as you do not hit 100% load on the PSU. its generally best to stay under 80% of the PSU's labeled wattage.
a b ) Power supply
February 2, 2013 10:14:57 AM

It gives you some headroom for what you could have missed or if you ever change anything.
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February 2, 2013 11:29:22 AM

so if i get in the calc
Minimum PSU Wattage: 354 W
Recommended
PSU Wattage: * 404W

i will probably pull 354W from wall but need at least 420W quality 82+ psu?

thank you
revro
a c 243 ) Power supply
February 2, 2013 11:40:32 AM

Anonymous said:
the higher is recommended so as you do not hit 100% load on the PSU. its generally best to stay under 80% of the PSU's labeled wattage.

Ran my system thru again, I use 100% TDP and 100% load, no crap aging
I7-930 @ 3.8Ghz 1.2v
GTX570HD
3 x 2g DDR3
1 SATA HD
1 DVD R/W
2 x 120mm LED
2 x 140 mm standard
1 x 120mm standard

517w minimum
567w reccomended

441 watts on the Killawatt when running Prime and Furmark
86% efficiency
http://www.plugloadsolutions.com/psu_reports/SP697_ANTE...
~380 watts
Would leave better than 25% overhead if using the 517 watt "minimum"

Gaming power draw is 50-60w lower, puts it around 65% load [on a 520w ], more than the "don't exceed 50% gang" likes, not more than a decent modern psu can handle
February 2, 2013 11:58:07 AM

well my take is, that i have good quality 500W 82+ psu and i want to add either 670 or 7970 to my system currently with 660, where i get from wall 239W and in psucalc shown calculation of 318W and 368W
so the question is can i go with 7970 which has 230-250tdp or could i stick with 670 which has 175W tdp. i know i cant go with 680 as evga 680 ftw has 38A needed on 12V and mine psu has only 18+18=36A

thank you
revro
Anonymous
a b ) Power supply
February 2, 2013 12:12:35 PM

delluser1 said:
Ran my system thru again, I use 100% TDP and 100% load, no crap aging
I7-930 @ 3.8Ghz 1.2v
GTX570HD
3 x 2g DDR3
1 SATA HD
1 DVD R/W
2 x 120mm LED
2 x 140 mm standard
1 x 120mm standard

517w minimum
567w reccomended

441 watts on the Killawatt when running Prime and Furmark
86% efficiency
http://www.plugloadsolutions.com/psu_reports/SP697_ANTE...
~380 watts
Would leave better than 25% overhead if using the 517 watt "minimum"

Gaming power draw is 50-60w lower, puts it around 65% load [on a 520w ], more than the "don't exceed 50% gang" likes, not more than a decent modern psu can handle


thanks for that.
February 10, 2013 12:51:35 PM

ok i always thought that 500w psu with 82% means it can draw at most 410w, now my friend tells me its like 500w is the 82% of max

anyway i would like to know why does amd and even nvidia vendors put on their cards warning that a card needs a 550w psu if the card has tdp 250w and the cpu +mb+ram are possibly 150w altogether.

tough i must say i saw my oced q9550@3.4GHz and evga 660ftw in the new 3d mark hit 275w pulled from wall, normally in 3d games its like 220w, while in unigine i saw peak of 239w

sry i made topic as discussion so cant give you points for best answer ...

thank you
revro

Best solution

Anonymous
a b ) Power supply
February 10, 2013 1:57:10 PM
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a 500 PSU with 82% efficiency will draw 610 watts (slightly rounded up)

"efficiency" mean how much of the AC power it draws from the wall it will be converted to DC power. the rest is dissipated as heat. remember a byproduct of energy is heat; more on that in a second.

if you what to know how much a PSU will draw from the wall at a specific load, efficiency slightly varies upon 20%, 50% and 80% loads, take the "rated" power and divide by the efficiency percentage. ie you see a 650 watt PSU that will be 83% @ 100% load.

650/0.83= 783 watts from the wall

to find out how much the system uses, such as delluser1 did with the draw from the wall being 441 watts and the PSU is 86% eff, just multiply the usage (441 watts) by the efficiency (86%):

441*0.86= 379.26 watts used for the system. (380 watts rounded up)

a TDP of a graphics card or cpu ect. is not how many watts it will actually use. as i mentioned before that heat is a byproduct of energy thermal design powerback is the measurement of how much heat a component needs to dissipate (i may not have worded that entirely correct). all/many manufacturers allow a safety margin.

so in other words a gpu with a TDP of 120 watts with proper cooling; will be able to handle the heat produced by 120 watts of power (energy). many cards won't hit that power point by staying under the safety margin while others may exceed it with better cooling. so the TDP is not the actually power usage but it will get you in the ballpark. finding a review or testing from a reputable web site or a post from a trusted member that is active on a forum would provide better details.

also the recommendations from a manufacturer as to the minimum PSU requirements take into consideration what a power hungry system would need; a 130 watt cpu, several hard drives, a handful of case fans (a fan itself can vary from a 1.5 watts to up to 10) and chipset that can draw 200+ watts itself (an overclocked FX-8350 will hit 180 watts alone!). again they make recommendation to allow for a safety margin. it is best to know what your system needs; an FX-8350 system would need a 550 PSU whereas an i3 only sips enough for a 450 watt PSU.


hope this helped w/o getting to "wordy" or confusing.
February 10, 2013 3:27:38 PM

yeah thanks, i am quite knowledgeable in hardware but some things i dont know. i am running a 95W cpu q9550 tough oced 1s ata hdd, 4 ddr2 ram modules and 1 dvd+-rw + 1 front 120mm and 1 rear 92mm fans so nothing terrible like 5hdds in raid :) 

anyway the 7970 gigabyte bundled with 2games with 550w psu req and 6+8 connectors, ist out of sale in local shop so i have to wait for a while. i quess 770 is not coming that soon either so who knows ...

thanks
revro
Anonymous
a b ) Power supply
February 10, 2013 3:52:24 PM

looking at you sig
PC: Q9550 @ 3.40 GHz | EVGA GTX 660 FTW Signature 2 3GB | 8GB (4x2) DDR2-800 | Seagate 250GB

am i wondering if you wouldn't be better served by updating that before jumping off into 7970 land. i read an article a few months back and the benchmarks showed a 15% different from a C2Q and a sandy bridge set up.
February 10, 2013 4:19:01 PM

wont be much bottleneck as i am changing from 1080 to 1440p, so gpu would be more under load because of nearly twice the amount of pixels on lcd (2MPix vs 3.7MPix).
There have been many benchmarks and once you go 2560x1440p the 7970 is not very bottlenecked. Generally conclusion was that for gaming, if it has 4 cores and its around 3.5ghz you are ok. Here is nice review to see it:
http://www.guru3d.com/articles_pages/radeon_hd_7970_cpu...

see athlon x5 645 is http://www.anandtech.com/bench/Product/188?vs=50 little lower than q9550@stock and i am actually running +20% overclock at 3.4GHz so i should be ok.

best
revro
Anonymous
a b ) Power supply
February 10, 2013 5:27:33 PM

revro said:
wont be much bottleneck as i am changing from 1080 to 1440p, so gpu would be more under load because of nearly twice the amount of pixels on lcd (2MPix vs 3.7MPix).
There have been many benchmarks and once you go 2560x1440p the 7970 is not very bottlenecked. Generally conclusion was that for gaming, if it has 4 cores and its around 3.5ghz you are ok. Here is nice review to see it:
http://www.guru3d.com/articles_pages/radeon_hd_7970_cpu...

see athlon x5 645 is http://www.anandtech.com/bench/Product/188?vs=50 little lower than q9550@stock and i am actually running +20% overclock at 3.4GHz so i should be ok.

best
revro

you have a decent line of logic albeit a bit long.

but look at:
http://www.anandtech.com/bench/Product/49?vs=288

now you can say, "but i overclock the quad" well, you can overclock the i5-2500k higher . . just putting that out there. (edit: for future reference)
February 10, 2013 6:29:10 PM

off course, thank you
i thought about going haswell + 3fire 7970 + 3x120hz lcds for about 3.3k eur together but then decided to upgrade my current rig from e7500 do q9550 and hd5750 to gtx 660ftw

now after reading about great oc of sandy against ivy and the same performance in games i was thinking about either i7-2700k or haswell but again for single gpu gaming on 2560x1440p a quad core @ 3.4ghz is sufficient. now if i were to venture into crossfire, the cpu would become the bottleneck. and i cant go higher as my rams are just 800mhz and fsb is 1600mhz. and 1066mhz rams cost like 170eur for 8gb, so i am staying at 3.4ghz

best
revro
February 11, 2013 2:18:58 PM

Best answer selected by revro.
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