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Minimum power for 7970 crossfire?

post #1 of 3
Thread Starter 
Hi all,

I have a 2600k at stock settings and a reference stock 7970 right now. I was looking to pick up a second 7970 and I currently have a Seasonic 650W gold rated power supply. Would this be too little power? The rest of my hardware is listed below. I've seen a few threads asking about 750W PSUs and 850W PSUs but I have not seen anything regarding 100W less. Using a few calculators they show 585W or so and then using Newegg's PSU calc it says 900W+.

Gigabyte Z68X-UD4-B3
Intel i7 2600K
4x4GB 1.5v PNY DDR3
Visiontek 7970 Reference
128GB Samsung 830 Series SSD
3 7200RPM drives
4 fans on a fan controller
Seasonic X650 Gold

Thank you!
post #2 of 3

At stock, a 650W would be fine.

 

If you want to push the cards and up the voltage then I'd go with a 750W (850W if you really want to push the cards to their limits).

Define
(20 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i7-3770K @ 4.3GHz Gigabyte GA-Z77X-UD5H ASUS GeForce GTX 980 Ti STRIX 6GB @ 1500MHz 2x8GB Kingston HyperX Fury DDR3 @ 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 840 Pro 256GB Crucial MX100 512GB Noctua NH-U14S 3x Noctua NF-A14 FLX 
OSMonitorMonitorKeyboard
Windows 10 Pro 64-bit Dell U2713HM Dell U2312HM Ducky Shine 3 Year of the Snake (MX Brown) 
PowerCaseMouseMouse Pad
EVGA SuperNOVA P2 650W Fractal Design Define R5 Black Mionix Naos 7000 SteelSeries QcK 
AudioAudioAudioOther
Sennheiser HD 650 Fostex TH-X00 Ebony Parasound Zdac TP-LINK Archer T9E  
CPUGraphicsRAMHard Drive
Intel Xeon E5-2620 v4 @ 3GHz Matrox G200eH2 4x8GB Kingston Dual Rank ECC DDR4 @ 2133MHz 2x Samsung PM863 120GB in RAID1 
Hard DriveOS
4x WD Red 3TB in RAID5 ESXi 6.5 
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Define
(20 items)
 
   
CPUMotherboardGraphicsRAM
Intel Core i7-3770K @ 4.3GHz Gigabyte GA-Z77X-UD5H ASUS GeForce GTX 980 Ti STRIX 6GB @ 1500MHz 2x8GB Kingston HyperX Fury DDR3 @ 2400MHz 
Hard DriveHard DriveCoolingCooling
Samsung 840 Pro 256GB Crucial MX100 512GB Noctua NH-U14S 3x Noctua NF-A14 FLX 
OSMonitorMonitorKeyboard
Windows 10 Pro 64-bit Dell U2713HM Dell U2312HM Ducky Shine 3 Year of the Snake (MX Brown) 
PowerCaseMouseMouse Pad
EVGA SuperNOVA P2 650W Fractal Design Define R5 Black Mionix Naos 7000 SteelSeries QcK 
AudioAudioAudioOther
Sennheiser HD 650 Fostex TH-X00 Ebony Parasound Zdac TP-LINK Archer T9E  
CPUGraphicsRAMHard Drive
Intel Xeon E5-2620 v4 @ 3GHz Matrox G200eH2 4x8GB Kingston Dual Rank ECC DDR4 @ 2133MHz 2x Samsung PM863 120GB in RAID1 
Hard DriveOS
4x WD Red 3TB in RAID5 ESXi 6.5 
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post #3 of 3
Quote:
Originally Posted by twerk View Post

At stock, a 650W would be fine.

If you want to push the cards and up the voltage then I'd go with a 750W (850W if you really want to push the cards to their limits).

What he says
Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal x2 Dali Opticon 2 
AudioOtherOther
x2 Dali Opticon 1 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
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Seravee
(27 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming EVGA GTX 1080 FTW2 Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD60EZRX  WD Red WD80EFZX 8TB  Seagate Ironwolf Pro 10 TB 
Optical DriveCoolingCoolingOS
LG CH12NS30 x5 Noctua NF-A14 FLX Noctua NH-D15S Windows 7 64 Bit 
MonitorMonitorKeyboardPower
Asus PG279Q LG 49UH750V 4K LED TV Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone EMP Roccat Sense Metor Sennheiser HD 598 
AudioAudioAudioAudio
Onkyo TX NR646  Harman Kardon HKTS 60 Dali Opticon Vokal x2 Dali Opticon 2 
AudioOtherOther
x2 Dali Opticon 1 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
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