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PSU watts consumption

post #1 of 14
Thread Starter 
On a group that im in online, someone said this
Quote:
Maybe someone can shed some light for me...Here's my system:

Mobo: Gigabyte UD7 Rev. 3
CPU: FX-9370 @ 1.476v 4.6Ghz
GPU: (2) R9 280x
RAM: Kingston HyperX 2133Mhz 4GB
PSU: NZXT 1000w

at system completely Idle, watt meter is showing 205w

GPU's at full load pulling 770ish watts

Now, with full load on both CPU/GPU's, my total wattage drops to around 650-670w. There are no ripples on the PSU that drops below specs while running tests and connected to an Oscope.


At first glance, I was thinking 1000w was overkill, and maybe 750w wouldve been perfect,
he also said his watts meter is showing values of 770ish or 650-670.

how is this possible?

i thought systems dont take up that much power?

or are the values right?
(since he has xfire, and im assuming OC'd)

EDIT: i asked and he only OC'ed CPU
Edited by IMKR - 4/4/14 at 8:43pm
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post #2 of 14
Quote:
Originally Posted by IMKR View Post

On a group that im in online, someone said this
At first glance, I was thinking 1000w was overkill, and maybe 750w wouldve been perfect,
he also said his watts meter is showing values of 770ish or 650-670.

how is this possible?

i thought systems dont take up that much power?

or are the values right?
(since he has xfire, and im assuming OC'd)

EDIT: i asked and he only OC'ed CPU

Depending on load and overclocking, those GPUS could easily pull 250-270 watts each....



http://www.tomshardware.com/reviews/radeon-r9-280x-r9-270x-r7-260x,3635-18.html

That CPU, when overclocked... can easily pull 250-300 watts plus... (or so I have read!). Looking for some tests showing that.

So yea.. that power consumption sounds possible.
Edited by cgipson1 - 4/4/14 at 9:22pm
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post #3 of 14
Thread Starter 
dam, team red isnt really power friendly -.-
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post #4 of 14
You need to measure in PSU efficiency. Even if it's 80%, it's actually ~600W
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post #5 of 14
Thread Starter 
Quote:
Originally Posted by AcEsSalvation View Post

You need to measure in PSU efficiency. Even if it's 80%, it's actually ~600W

???

im taking multiple meanings out of this. what part are u refering too?
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post #6 of 14
Quote:
Originally Posted by IMKR View Post

???

im taking multiple meanings out of this. what part are u refering too?

so if the pc is using 480 watts that means a 80% efficient psu is actually pulling 600 watts at the wall.
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post #7 of 14
Quote:
Originally Posted by IMKR View Post

???

im taking multiple meanings out of this. what part are u refering too?
The efficiency factor now determines how much the power supply absorbs from the electrical outlet and dissipates into heat. If the power supply in this example has an efficiency of 80%, this means 20% of the power taken from the outlet is wasted. So while the PC uses 600watts, the power meter shows 750 watts (since 750 * 80% = 600).

AcEsSalvation math was incorrect.

Quote:
Originally Posted by IMKR View Post

dam, team red isnt really power friendly -.-
One single Titan draws near 500w when OC'd. thumb.gif
With heavy OCs, efficiency goes out the window.
Edited by Swolern - 4/5/14 at 12:12am
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post #8 of 14
I rounded down by the way, however the point is that people see figures like this then tell others that these cards are drawing an insane amount of power. Gives a bad name when it happens, and causes product loyalty.
Also about the Titan, same power draw as any other 8+6 pin card. Always remember PSU efficiency and the connectors.
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post #9 of 14
Quote:
Originally Posted by AcEsSalvation View Post

I rounded down by the way, however the point is that people see figures like this then tell others that these cards are drawing an insane amount of power. Gives a bad name when it happens, and causes product loyalty.
No you did 800 / 20= 600. Its 750 * 80% = 600. Its not the same.
Quote:
Also about the Titan, same power draw as any other 8+6 pin card.
Incorrect. Not every GPU with 8+6 pin pull 500 watts when OCd. LOL. Titans and just a couple other single gpu GK110 have voltage unlocked up to 1.600v.
Edited by Swolern - 4/5/14 at 12:39am
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post #10 of 14
Thread Starter 
so i understand how you got 600w power draw.

but where did the 750w come from? (to get 750w * 80%)

or was it just a hypothetical value for an example?

i understand about the wasted heat, efficiency and such,

but i dont understand where u got the value from (from my first post???)


so are u guys saying that the NZXT 1000w isnt needed still?

and that even tho its "GPU's at full load pulling 770ish watts" its actually 616w ? (770 x 80%)

so a 750w PSU would be good enough?
Edited by IMKR - 4/5/14 at 12:40am
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Rosewill Capstone 550w Corsair carbide 200r 
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Pentium G3220 MSI H81m-P33 G.SKILL Sniper Series 4GB PNY XLR8 SSD 120GB 
Optical DriveOSPowerCase
Cheapest Drive I Was Able To Find Windows 7 Corsair CX 450w NZXT Source 210 
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