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Can my power supply handle dual 4870x2?

post #1 of 3
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This is what I have

i5 3570k
(16 items)
 
 
Fat Belly
(9 items)
 
CPUMotherboardGraphicsRAM
i5 3570k Asus P8Z77-VPRO Gigabyte 670 oc Patriot Viper Extreme  
Hard DriveHard DriveOptical DriveCooling
Samsung 830 64 GB  Crucial M4 64GB ihas424 Scythe mugen rev.b 
OSMonitorKeyboardPower
Windows 7 64 Bit Apple Cinema 30 Optimus Maximus  XFX 650  
CaseMouseMouse PadAudio
Lian Li T60R Razer Abyssus Razer Sphex Sennheiser 558 
CPUMotherboardGraphicsRAM
athlon 64 4000+ Asus A8N-SLI Deluxe gts 250 4gb ddr-400 
Hard DriveOSPowerCase
Seagate 150GB windows xp Antec Basiq Series VP450 thermaltake armor 
CPUMotherboardGraphicsRAM
e4300 ga-965p-ds3 ati rage xl 4gb ddr2-667 
Hard DriveOSPowerCase
samsung 2tb Windows 7 Thermaltake Tr2 aerocool engine t3 
Other
Perc 6i 
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i5 3570k
(16 items)
 
 
Fat Belly
(9 items)
 
CPUMotherboardGraphicsRAM
i5 3570k Asus P8Z77-VPRO Gigabyte 670 oc Patriot Viper Extreme  
Hard DriveHard DriveOptical DriveCooling
Samsung 830 64 GB  Crucial M4 64GB ihas424 Scythe mugen rev.b 
OSMonitorKeyboardPower
Windows 7 64 Bit Apple Cinema 30 Optimus Maximus  XFX 650  
CaseMouseMouse PadAudio
Lian Li T60R Razer Abyssus Razer Sphex Sennheiser 558 
CPUMotherboardGraphicsRAM
athlon 64 4000+ Asus A8N-SLI Deluxe gts 250 4gb ddr-400 
Hard DriveOSPowerCase
Seagate 150GB windows xp Antec Basiq Series VP450 thermaltake armor 
CPUMotherboardGraphicsRAM
e4300 ga-965p-ds3 ati rage xl 4gb ddr2-667 
Hard DriveOSPowerCase
samsung 2tb Windows 7 Thermaltake Tr2 aerocool engine t3 
Other
Perc 6i 
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post #2 of 3
I think it is not enough. AMD recommends a 1000W power supply to power a system with two 4870x2s in a system. So I think that the minimum is a high quality 850W power supply.

http://www.amd.com/us/products/deskt...uirements.aspx
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 #3 of 3
It could borderline work. Here's a breakdown of a single 4870X2 power consumption (ex. 455W load furmark).

Math warning: Some 15% is the PSUs inefficiency and some 120W (at least) should be the rest of the system. Taking these into account, the 4870x2 takes only some 250W (which is the limit for PCIe anyway) so adding a second 4870x2 should pump up the consumption by some 250-270W (to take into account the Xfire CPU overhead).

The end result is some 700W for a similar rig & 2x4870x2. You have a more power efficient CPU, so you should have more headroom.

/found a more reliable power measurement (gpu only); I think 750W should be enough:
Centurion
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 940 @3.3GHz 1.25V Gigabyte 790X-DS4 XFX 5850 8GB OCZ DDR2-800 
Hard DriveCoolingOSMonitor
Corsair Force 3 TRUE Win 7 Pro x64 ACER 23" TN  
PowerCase
400W Silverstone Strider Antec P182 
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Centurion
(14 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II 940 @3.3GHz 1.25V Gigabyte 790X-DS4 XFX 5850 8GB OCZ DDR2-800 
Hard DriveCoolingOSMonitor
Corsair Force 3 TRUE Win 7 Pro x64 ACER 23" TN  
PowerCase
400W Silverstone Strider Antec P182 
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