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Help me realize how big of a PSU I need

post #1 of 46
Thread Starter 
Hey guys,

I am dreadfully sorry that I have to start a new thread for this, but I am so new to this forum that I am probably breaking a rule with this already.

I am posting my desired build and would like to know what I should realistically consider for a PSU, if you could back up your answers with facts that would be handy:) I have done a lot of research but need to know for my specific needs what should be recommended.

My desired build is as follows:

CPU - Intel Core i7-3770K Quad Core
Motherboard - ASUS Maximus V Formula
Hard Drive - 3TB Seagate Barracuda 7200
Optical Drive - Basic DVD Read/Write (may add a bluray to this later)
Video Card - 2x Radeon HD 7970's
RAM - 16GB 1866MHz G.Skill (probably 4x4)
SSD - Something in the 250GB area
Power Supply - ???
CPU Cooling - Corsair H100i

I also plan to put stupid lights all over it and rice this thing out. I want it to be future proof and the only pieces I've fully committed to already are the dvd drive, the h100i, and the case. Any suggestions whatsoever are welcome, but I am considering a 1000W PSU, odds are I am being rediculous, but I want to keep adding to this thing for a while.

Ultimate goal is to run this thing with 3 monitors, adding a sound card later, and more HDD's for media and such.

Thanks again in advance, and please try to be helpful, if you get on here just to be obnoxious and hate on something I've posted please refrain.redface.gif
post #2 of 46

For this with two 7970s in it, all you need is a quality-made 650W power supply:

 

http://www.guru3d.com/articles_pages/asus_radeon_hd_7970_crossfire_review,7.html

 

With two 7970s under full load in their system, their PSU pulled 567W from the wall outlet.  Their CPU was idling, so I have to add 150W for a 3770K at 5 GHz under full load.  So adding 150W to 567W makes the PSU pulling 717W from the wall outlet, and so if the PSU is 85% efficient while pulling 717W from the wall outlet, then the system is pulling 609W from the PSU.  This is unrealistically high because I'm saying the 7970s and the 3770K are completely maxed out simultaneously, plus I'm saying the 3770K is at 5 GHz and pulling 150W.  Your actual gaming load will be about 500-525W on average.  Therefore, a quality-made 650W would keep your average power draw right in the sweet spot which maximizes your PSU's efficiency.

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 
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250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
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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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It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #3 of 46
Thread Starter 
Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif
post #4 of 46
Quote:
Originally Posted by Colorful Dan View Post

Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif
The only downside is that you're wasting money on something that won't benefit you at all.
Define
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Define
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post #5 of 46
Quote:
Originally Posted by Colorful Dan View Post

Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif

 

Yep: it's a waste of money.  ;)  Or, you could end up having to settle for a lower-quality unit in order to avoid spending more than you otherwise would with a very nice 650W power supply.

 

If you're concerned about future upgrades, then don't be unless you plan on adding a third 7970 or having three top-of-the-line video cards some day.  I mean, each new generation of GPUs and CPUs requires less power than the previous, so getting a quality-made 650W should last "forever".

 

If you plan on heavily overclocking the 7970s and even increasing their voltages quite a bit, then maybe get a nice 750W PSU, but that wouldn't really be the minimum.

 

Can you order from Newegg.com?

It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
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post #6 of 46
Quote:
Originally Posted by Colorful Dan View Post

Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif

Quote:
Originally Posted by AndyM95 View Post

Quote:
Originally Posted by Colorful Dan View Post

Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif
The only downside is that you're wasting money on something that won't benefit you at all.

Well, you should know PSU's are the most efficient at around 50% load. So if most of the time your PSU is at 50% load, then you have the right PSU. There is no bad thing for having a bit of head room.

Personally, I would say a 750 or 850w PSU.
post #7 of 46
Quote:
Originally Posted by AndyM95 View Post

The only downside is that you're wasting money on something that won't benefit you at all.

There are several upsides too. First, you can have upgrade flexibility. Second, your PSU will run cooler with more headroom which means less fan noise. Third, PSU typically have maximum efficiency at 50% load. So 850W PSU is likely to save your power bill a bit.
post #8 of 46
Quote:
Originally Posted by Colorful Dan View Post

Another question I have to add:
If I do decide to be over the top and get a 850-1000w, are there any downsides to that? I feel like you can never have too much power, but obviously, I can be wrong, this is my first personal build and I just want to make sure I do everything right:thumb.gif

As side from the money spent that was not needed to be.

going with two cables estimation of ~500w pull while gaming
PSUs are not intended to be very efficient at 50% draw (assuming a 1000w PSU) so your power bill might take a hit using a PSU in such an inefficient way
Quote:
Originally Posted by Whalemeal View Post

There are several upsides too. First, you can have upgrade flexibility. Second, your PSU will run cooler with more headroom which means less fan noise. Third, PSU typically have maximum efficiency at 50% load. So 850W PSU is likely to save your power bill a bit.

this use to be true(40%-60%), however now its usually 80+ (which is why we have 80+ ratings) assuming a quality build PSU, which is pretty much the most important part of your build. (its the heart if you will)
Edited by Jim888 - 2/21/13 at 9:12am
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LIttle Giant
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Old HP upgraded
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CPUMotherboardGraphicsGraphics
3570k Asus P8Z77-I Deluxe  AMD Radeon HD Myst 7870 Tahiti Accelero Twin Turbo II 
RAMHard DriveHard DriveMonitor
16GB Corsair 1600  Samsung 840pro Samsung 500 GB 2.5" 7200 HDD Asus VG236h 120hz  
KeyboardPowerCaseMouse
Corsair K90 Corsair 500w Bitfenix Prodigy  Logitech G9x 
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Rocketfish Hard dual sided Creative 2.1 speakers/Razer Megalodon/Charasis  
CPUMotherboardGraphicsRAM
I5 2500k Asus P8Z68-lx XFX 685X Pny 
Hard DriveHard DriveHard DriveOptical Drive
Wd caviar black FAALS Wd caviar blue  Ocz agility 2 Ssd Asus dvd burner 
CoolingOSMonitorKeyboard
Frio Win 7 home premium Hp 2207 Logitech G11 (rev 1) 
PowerCaseMouseMouse Pad
Pc power and colling 775w Antech 900 Logitech G9x Rocketfish 
Audio
Razer megalodon 
CPUMotherboardGraphicsHard Drive
Athlon X2 4800+ ESC Nettle2 Asus 5770 wd Black 
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post #9 of 46
850 puts your mind at ease
750 its alright
650 :/ should be enough

That's how i chose mine :L
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1st Custom Build
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post #10 of 46

No.

 

On PSU Efficiency

 

PSU "50% Load" Myth

It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
It's a computer!
(19 items)
 
  
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 
Mouse PadAudioAudio
Basic, but premium round X-Fi Titanium HD Klipsch ProMedia 2.1 (with 16 AWG Monster Cable... 
  hide details  
Reply
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