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crossfire

post #1 of 5
Thread Starter 
Hi all! I want to do crossfire with ati hd 6850 and another 6850 or 6870.
What power supply should I buy?
I have a 965 x4, 16gb ram 2133mhz.
Thanks for all.
post #2 of 5
What is your budget?



http://www.guru3d.com/articles_pages/radeon_hd_6850_6870_review,10.html

Hardware installation

Installation of any of the AMD Radeon cards is really easy. Once the card is seated into the PC make sure you hook up the monitor and of course any external power connectors like the 6 and/or 8-pin PEG power connectors. Preferably get yourself a power supply that has these PCIe PEG connector native (converting them from a Molex Peripheral connector anno 2010 we feel is a no-go).

Download AMD Radeon drivers

Once done we boot into Windows, install the latest ATI Catalyst drivers and after a reboot, all should be working. No further configuration is required or needed unless you like to tweak settings, for which you can open the Catalyst Control Center.
Power consumption

Lets have a look at how much power draw we measure with this graphics card installed.

The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.

Our test system is based on a power hungry Core i7 965 / X58 based. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, water-cooling, additional cold cathode lights etc.

Keep that in mind. Our normal system power consumption is higher than your average system.

Measured power consumption - 6850

Advertised TDP = 127W
System in IDLE = 176W
System Wattage with GPU in FULL Stress = 278W
Difference (GPU load) = 102 W
Add average IDLE wattage ~ 19W
Subjective obtained GPU power consumption = ~ 121 Watts

Measured power consumption - 6870

Advertised TDP = 150W
System in IDLE = 173W
System Wattage with GPU in FULL Stress = 295W
Difference (GPU load) = 122 W
Add average IDLE wattage ~ 19W
Subjective measured GPU power consumption = ~ 141 Watts

Bear in mind that the system Wattage is measured from the wall socket and is for the entire PC. Below, a chart of measured Wattages per card. Overall this is much higher than reference, this is due to an increased GPU voltage to allow easy overclocking and the standard higher clock frequencies.



http://www.newegg.com/Product/Product.aspx?Item=N82E16817182066 You will be good with this power supply.
Queso Fresco
(15 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770k GIGABYTE G1.Sniper M3 Z77 ASUS Turbo GTX 1060  G. Skill Trident X 2400 16gb 
Hard DriveHard DriveCoolingOS
Samsung 840 250gb Intel 320 160gb SilverStone Heligon HE01 Windows 10 
MonitorKeyboardPowerCase
Achieva Shimian  Monoprice MX Black SeaSonic X-750 Corsair 350D 
Mouse
Nixeus Revel 
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Queso Fresco
(15 items)
 
  
CPUMotherboardGraphicsRAM
i7 3770k GIGABYTE G1.Sniper M3 Z77 ASUS Turbo GTX 1060  G. Skill Trident X 2400 16gb 
Hard DriveHard DriveCoolingOS
Samsung 840 250gb Intel 320 160gb SilverStone Heligon HE01 Windows 10 
MonitorKeyboardPowerCase
Achieva Shimian  Monoprice MX Black SeaSonic X-750 Corsair 350D 
Mouse
Nixeus Revel 
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post #3 of 5
Cooler Master V700 is one option
Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
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Seravee
(24 items)
 
  
CPUMotherboardGraphicsRAM
Intel Core I7 6850K Gigabyte X99 Ultra Gaming Gigabyte GTX 970 G1 Gaming Kingston HyperX DDR4 Savage 3000 MHz 
Hard DriveHard DriveHard DriveHard Drive
Samsung 840 Evo WD Green WD30EZRX  WD Green WD40EZRX  WD Green WD60EZRX  
Hard DriveOptical DriveCoolingCooling
WD Red WD80EFZX 8TB  LG CH12NS30 5x Noctua NF-A14 FLX Noctua NH-D15 
OSMonitorKeyboardPower
Windows 7 64 Bit Asus PG279Q Corsair Gaming Strafe RGB EVGA SuperNova G2 750 watt 
CaseMouseMouse PadAudio
Phanteks Enthoo Luxe Roccat Kone XTD Laser Roccat Sense Metor Sennheiser HD 598 
AudioAudioOtherOther
Onkyo TX NR646  Harman Kardon HKTS 60 CableMod E series PSU cable set CableMod LED Strips 
  hide details  
Reply
post #4 of 5
Thread Starter 
Thanks for answer and info!
Greetings
post #5 of 5
Iv got that setup with a 8350 and my 420W antec psu holding up fine with a good overclock on both.
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