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How much Power for my build

post #1 of 8
Thread Starter 
I remember reading somewhere on this forum that for most accurate advice, it is still best to consult forum members as opposed to using the psu calculators. This is what I am doing now.

Setup
i5 2500k(going to be overclocking this beast)
2 6950s in Crossfire
Fatal1ty sound card with front reciever
Asus P8P67 PRO
2 SSDs
2-3 HDDs
Corsair H70
CPU Cooler

Thanks
post #2 of 8
A good 650W unit would be perfect.
post #3 of 8
An XIGMATEK NRP-PC702 should fare well. Is it the best PSU of all time? No. But for $75, you can't do much better. Internals are generally very good. Nippon-Chemi-con on the PFC circuit and a few Teapos on the secondary with quite a few polymers. A few Sus'cons are assigned for coupling caps, which are generally junk, but they aren't actually doing any extreme filtering, so they're fine.

Good ripple supression/ voltage regulation.

Good supply for the money. Note: It's not modular.
Unlawful
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Seasonic M12-II 430W Modular Cooler Master Elite 332 
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Unlawful
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Samsung 830 Seagate Barracude 7200.12 Samsung F3 1TB Windows 7 Home x64 
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Seasonic M12-II 430W Modular Cooler Master Elite 332 
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post #4 of 8
I think you will need a bit more then 650w - 700w . . . closer to 900w if I were building it.

A single 6950 draws around 225-240w under load. So for a Xfire that will be pushing 450ish watts before you even through the pc gear and multiple hdd's on top of OCing. Just my 2 cents
post #5 of 8
Quote:
Originally Posted by Bear907 View Post
I think you will need a bit more then 650w - 700w . . . closer to 900w if I were building it.

A single 6950 draws around 225-240w under load. So for a Xfire that will be pushing 450ish watts before you even through the pc gear and multiple hdd's on top of OCing. Just my 2 cents
Check this out:

http://www.guru3d.com/article/radeon...irex-review/14

Their test system's power supply pulled 473W from the wall during a full-load test on just the graphics cards. If we say that the PSU was 85% efficient during this power draw, then that would mean that the system pulled about 402-403W from the power supply.

So, Shub is correct: a quality 650W power supply really would be a perfect choice.

In addition: AMD recommends a 500W power supply to power a system with one 6950 in it, so that means that they would recommend a 600W to power a system with two 6950s in it.

http://www.amd.com/us/products/deskt...verview.aspx#3
It's a computer!
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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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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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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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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 8
Quote:
Originally Posted by Bear907 View Post
I think you will need a bit more then 650w - 700w . . . closer to 900w if I were building it.

A single 6950 draws around 225-240w under load. So for a Xfire that will be pushing 450ish watts before you even through the pc gear and multiple hdd's on top of OCing. Just my 2 cents
Actually a single 6950 draws around 150W on an average gaming load, pushing it to 170-180W under full stress.
post #7 of 8
http://extreme.outervision.com/psucalculatorlite.jsp

I couldn't believe 650w was right but it is. I loaded it up with fans, cathodes, OC'd CPU to 4.4Ghz@1.38v , usb devices, 2HHDs 1 SSD, and a few extra things and it came out to 622w @ 90% load with 10% capacitor aging. That is outstanding!
PowerTrippin@home
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Kingston V Series SSD 64 GB Spinpoint F3 1TB Blu-Ray drive & CD/DVD burner Scythe Mugen II 120mm Ultra Kaze 64bit Windows 7 
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PowerTrippin@home
(14 items)
 
  
CPUMotherboardGraphicsRAM
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Hard DriveOptical DriveCoolingOS
Kingston V Series SSD 64 GB Spinpoint F3 1TB Blu-Ray drive & CD/DVD burner Scythe Mugen II 120mm Ultra Kaze 64bit Windows 7 
MonitorKeyboardPowerCase
Samsung 23" LED 1920x1080 [SyncMaster BX2331] Dell SK-8110 Corsair TX-750 V2 HAF 922 [inside painted black] 
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Logitech Laser G500 Razer Vespula 
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post #8 of 8
Quote:
Originally Posted by PowerTrip View Post
http://extreme.outervision.com/psucalculatorlite.jsp

I couldn't believe 650w was right but it is. I loaded it up with fans, cathodes, OC'd CPU to 4.4Ghz@1.38v , usb devices, 2HHDs 1 SSD, and a few extra things and it came out to 622w @ 90% load with 10% capacitor aging. That's is outstanding!
And since you used a calculator, you can safely expect the actual power draw to be lower.
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