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post #11 of 29
Power supply calculator > http://www.extreme.outervision.com/psucalculatorlite.jsp
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post #12 of 29

PSU calculators like that one aren't very accurate unless used in a specific way. Even then, they're not 100% accurate.

It's a computer!
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It's a computer!
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post #13 of 29
Thread Starter 
That particular calculator rated it at 768w with just an overclocked CPU. frown.gif lol
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Gideon
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post #14 of 29
Quote:
Originally Posted by Melee View Post

That particular calculator rated it at 768w with just an overclocked CPU. frown.gif lol

 

Yep! Its accuracy depends on how you use it. Try it again, but this time use a System Load of 75% and no capacitor aging. Also say Regular Desktop instead of High End.

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It's a computer!
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Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
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post #15 of 29
Thread Starter 
Quote:
Originally Posted by TwoCables View Post

Yep! Its accuracy depends on how you use it. Try it again, but this time use a System Load of 75% and no capacitor aging. Also say Regular Desktop instead of High End.


523w.....haha

That's a pretty huge difference, obviously.
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Gideon
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For Sale: Astro A40 Headset + Astro Mixamp Pro
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post #16 of 29
Quote:
Originally Posted by Melee View Post


523w.....haha

That's a pretty huge difference, obviously.

 

That's much more accurate! See here:

 

http://www.guru3d.com/articles_pages/his_radeon_hd_7950_review,8.html

 

With one 7950 under full load in their system, their PSU pulled 300W from the wall outlet. The 7950 alone pulled 138W, so for two 7950s I have to add another 138 which would then make the PSU pull 438W from the wall outlet. Their CPU was idling, so if I assume that the 4770K will pull about 150W at 5 GHz just like the 3770K does, then I can add up to 150W on top of 438W which makes the PSU pulling 588W from the wall outlet. This means that if the PSU is 90% efficient while pulling 588W from the wall outlet, then the computer is pulling 529W from the PSU. The gaming power draw could be even lower at around 450-500W or even just slightly more by a handful of watts.

 

Although, this is provided that the 7950s aren't overclocked all that much. I mean, if I remember correctly, then I think that if they're overclocked with a voltage increase, then these numbers go right out the window. Otherwise, the 7950s don't pull much power at all.

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i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
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It's a computer!
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CPUMotherboardGraphicsRAM
i5-2500K @ 4.5GHz (1.368-1.384V fixed voltage) ASUS P8P67 EVO B3 (UEFI ver. 1850) GTX 780 ASUS DirectCU II (1228 / 6300, 1.180V) G.SKILL Ripjaws X 8GB (2 x 4GB) 1866MHz, CL9 
Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #17 of 29
Thread Starter 
I MIGHT be upgrading to 7970s as I think my surround setup needs a bit more power.

I have a Corsair AX850 that I was going to use in a build for my brother as I bought it in a package from a fellow forum member. Would that cut it for two overclocked 7970s and an overclocked 4770k?

Or, would I be better off using something like the Corsair HX1050 just to be on the safe side?

I promise I've read and understood every word I just know you guys also said that if both the cards are overclocked, then it's hard to tell how much power they will use. I'd rather not have my computer explode. thumb.gif lol

Thanks!
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Gideon
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For Sale: Astro A40 Headset + Astro Mixamp Pro
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post #18 of 29
Quote:
Originally Posted by Melee View Post

I MIGHT be upgrading to 7970s as I think my surround setup needs a bit more power.

I have a Corsair AX850 that I was going to use in a build for my brother as I bought it in a package from a fellow forum member. Would that cut it for two overclocked 7970s and an overclocked 4770k?

Or, would I be better off using something like the Corsair HX1050 just to be on the safe side?

I promise I've read and understood every word I just know you guys also said that if both the cards are overclocked, then it's hard to tell how much power they will use. I'd rather not have my computer explode. thumb.gif lol

Thanks!
The AX850 is absolutely fine smile.gif

You could use a good quality 650W and still be fine (just), a 750W is recommended and an 850W will give you plenty of headroom.
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Define
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post #19 of 29
Thread Starter 
Sounds great and extremely convenient. I've worked with the AX850 before and love the fully black, modular cabling so this is definitely win/win. thumb.gif

Thanks a lot for all the help. I truly appreciate it.
Gideon
(10 items)
 
For Sale: Astro A40 Headset + Astro Mixamp Pro
$179.99 (USD)
CPUMotherboardGraphicsRAM
Intel i7 6700K Asus Z170i Pro Gaming GTX 1080 Corsair Vengeance LED 32GB 3200 Mhz 
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Gideon
(10 items)
 
For Sale: Astro A40 Headset + Astro Mixamp Pro
$179.99 (USD)
CPUMotherboardGraphicsRAM
Intel i7 6700K Asus Z170i Pro Gaming GTX 1080 Corsair Vengeance LED 32GB 3200 Mhz 
Hard DriveCoolingOSPower
Samsung 950 PRO 256GB NZXT Kraken X61 Windows 10 EVGA P2 SuperNOVA 850w 
CaseAudio
NZXT Manta Astro A40 TR + Astro Mixamp TR 
  hide details  
Reply
post #20 of 29
Quote:
Originally Posted by Melee View Post

I MIGHT be upgrading to 7970s as I think my surround setup needs a bit more power.

I have a Corsair AX850 that I was going to use in a build for my brother as I bought it in a package from a fellow forum member. Would that cut it for two overclocked 7970s and an overclocked 4770k?

Or, would I be better off using something like the Corsair HX1050 just to be on the safe side?

I promise I've read and understood every word I just know you guys also said that if both the cards are overclocked, then it's hard to tell how much power they will use. I'd rather not have my computer explode. thumb.gif lol

Thanks!

That psui is fine. The HX 1050 is overkill.
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My System
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