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post #11 of 25
The AX750 is enough for a system with two 6970s in it, but not two 6990s. Well, maybe. If it's enough for two 6990s, then it would be cutting it extremely close under load with everything at stock.
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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) 
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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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post #12 of 25
AX750 will easily handle 6970 xfire...dare I say 6990+6970 trifire.
post #13 of 25
Quote:
Originally Posted by GizmoDuck View Post
I do plan on getting another 6970 down the road or even a 6990 if I am feeling real crazy. Would the AX750 be enough for either of these dual card setups?

Reason I only listed Corsair as options is, I am strapped for time and Bestbuy is my only option. Looked like Corsair was the best they offered.
AX750 is over kill and not needed for either card. Even a CF 6970 or 6990 all you need is a good 650 watt. Is Gold Plus efficiency that important to you? I got the AX850 because it was only $150 on sale and I wanted SLI 580s in the future.

If Best Buy your only option... then I would just get the GS700 for $100. That actually a good deal.

http://www.bestbuy.com/site/Corsair+...pply&cp=1&lp=8

or the TX 650 for $93

http://www.bestbuy.com/site/Corsair+...ply&cp=1&lp=14

If modular is a 'big' thing for you...then get the HX650 for $123

http://www.bestbuy.com/site/Corsair+...pply&cp=1&lp=5
MCC
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MCC
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Samsung 840 120 gb SSD Samsung Noctua NH-D14 Windows 7 Ultimate 
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post #14 of 25
Quote:
Originally Posted by mcc21 View Post
AX750 is over kill and not needed for either card. Even a CF 6970 or 6990 all you need is a good 650 watt. Is Gold Plus efficiency that important to you? I got the AX850 because it was only $150 on sale and I wanted SLI 580s in the future.
The 6990 is a much more powerful card. To power a system with just one 6990 in it (I am assuming you are talking about two), AMD recommends a 750W peak-rated power supply which means a quality 650W power supply would be needed if there was just one in a system. For two, a quality 850W is needed (at least).
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 #15 of 25
Quote:
Originally Posted by TwoCables View Post
The 6990 is a much more powerful card. To power a system with just one 6990 in it (I am assuming you are talking about two), AMD recommends a 750W peak-rated power supply which means a quality 650W power supply would be needed if there was just one in a system. For two, a quality 850W is needed (at least).
Sorry i meant CF 6970 or ONE 6990 for a 650 watt psu
MCC
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CPUMotherboardGraphicsRAM
i5-2500k  Gigabyte GA-Z77X-UD5H MSI GTX 680 Lightning Ed. Patriot Intel Extreme Masters Limited Edition 
Hard DriveOptical DriveCoolingOS
Samsung 840 120 gb SSD Samsung Noctua NH-D14 Windows 7 Ultimate 
MonitorKeyboardPowerCase
Samsung SyncMaster S27A850D  CM Storm Quick Fire  Corsair AX850 Fractal Design Define R4 
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Steelseries Sensei Creative T20 
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MCC
(15 items)
 
  
CPUMotherboardGraphicsRAM
i5-2500k  Gigabyte GA-Z77X-UD5H MSI GTX 680 Lightning Ed. Patriot Intel Extreme Masters Limited Edition 
Hard DriveOptical DriveCoolingOS
Samsung 840 120 gb SSD Samsung Noctua NH-D14 Windows 7 Ultimate 
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Samsung SyncMaster S27A850D  CM Storm Quick Fire  Corsair AX850 Fractal Design Define R4 
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Steelseries Sensei Creative T20 
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post #16 of 25
If you're planning on a 2nd HD6970, then go grab the AX750 no doubt, it is a great PSU. However, if you're planning to maybe get an HD6990 (So you can do HD6970 + HD6990 Tri-Fire) then you'd be better off getting an AX850 instead.

It's really up to what you're going to use it with.

6970 CF -> AX750
6970 TriFire or 6970 + 6990 Trifire (Which is basically the same thing ) -> AX850
    
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post #17 of 25
Quote:
Originally Posted by mcc21 View Post
Sorry i meant CF 6970 or ONE 6990 for a 650 watt psu
Damn. I thought so. lol Oh well.
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  
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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... 
  hide details  
Reply
post #18 of 25
With Crossfire HD 6970s, you would want to keep away from adjusting the power cap too much on a 650W PSU (yes even with an i5-2500k, which admittedly keeps the rest of the system power consumption pretty low). It should be okay though, particularly for normal use and gaming.
post #19 of 25
My set up is close to his, which power supply and how much.

-i5-2500K (Overclocked to at least 4.0 GHz)
-EVGA GTX 560ti SC
-MSI GD65
-black vengeance DDR3 8gb 1600mhz


Im planing on getting everything from Frys since they have some good deals now, they recommended the coolermaster silent pro gold 800W, its $160.
post #20 of 25
If there is any chance at all that you will crossfire that 6970 in the future, go with the AX750. It sucks to have to buy another PSU when you decide to add a second card....
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