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6950 Crossfire help

post #1 of 19
Thread Starter 
i had to send in my xfx 5870 for rma, and now i am most likely going to get 6950 1gb back from the company. i want to run crossfire with the card, but i am unsure what to do. I want to run 3 of them, but i have heard that running 3 cards in crossfire is problematic.

I am using a 2600k on a z58-ud7 board with a corsair ax1200w psu, so i am pretty sure i am ok for bottlenecks, pci lanes, and power.

thanks!
post #2 of 19
All i know is that two 6950s crossfire great and that you should get a bigger power supply if you want to go Tri X-fire, as my sig rig seems to run alot of power. and you would need two crossfire bridges one from top to middle and then one from middle to bottom.
 
G74sx
(13 items)
 
 
CPUMotherboardGraphicsGraphics
AMD FX-8120 Zambezi 4.6ghz ASUS Crosshair V Formula AM3+  ASUS Radeon HD 6950 DirectCU II 810MHZ 2GB 5GH... HIS 6950 IceQ X Turbo 1GB GDDR5 PCI-E 2xDVI/HDM... 
RAMHard DriveHard DriveOptical Drive
G.SKILL Sniper Series 8GB 2tb WD black 128GB corsair force GT samsung writemaster 
CoolingOSMonitorKeyboard
Corsair H100  Windows 7 (64bit) 42inch Samsung plasma TV and 21inch Samsung screen  Azio Levetron KB588U Mech4 Mechanical Programm... 
PowerCaseMouseMouse Pad
CORSAIR Professional Series Gold AX850 HAF X R.A.T 7 Rocketfish duel side anodized aluminium (speed ... 
Audio
Asus Thunderbot, rog Vulcan anc  
CPUMotherboardGraphicsRAM
Intel Core I7-2630qm 2.0ghz g74sx (ROG) Geforce gtx 560m (3gb) 16gb (4x4gb) 
Hard DriveOSPower
1x 600gb Wd VelociRaptor 1x120gb ssd Window's 7 stock 
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G74sx
(13 items)
 
 
CPUMotherboardGraphicsGraphics
AMD FX-8120 Zambezi 4.6ghz ASUS Crosshair V Formula AM3+  ASUS Radeon HD 6950 DirectCU II 810MHZ 2GB 5GH... HIS 6950 IceQ X Turbo 1GB GDDR5 PCI-E 2xDVI/HDM... 
RAMHard DriveHard DriveOptical Drive
G.SKILL Sniper Series 8GB 2tb WD black 128GB corsair force GT samsung writemaster 
CoolingOSMonitorKeyboard
Corsair H100  Windows 7 (64bit) 42inch Samsung plasma TV and 21inch Samsung screen  Azio Levetron KB588U Mech4 Mechanical Programm... 
PowerCaseMouseMouse Pad
CORSAIR Professional Series Gold AX850 HAF X R.A.T 7 Rocketfish duel side anodized aluminium (speed ... 
Audio
Asus Thunderbot, rog Vulcan anc  
CPUMotherboardGraphicsRAM
Intel Core I7-2630qm 2.0ghz g74sx (ROG) Geforce gtx 560m (3gb) 16gb (4x4gb) 
Hard DriveOSPower
1x 600gb Wd VelociRaptor 1x120gb ssd Window's 7 stock 
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post #3 of 19
Thread Starter 
Are you sure. I highly doubt 3 6950's would need more then 1200w of power
post #4 of 19
Wait..
How are you getting a 6950 in replacement for a 5870?

In addition, you're getting THREE 6950s back?
post #5 of 19
Ran a tri-crossfire, with a 2600k, 2 High Perf. HDD, 1 Green, 2 SSD, and a few other nickbits, got ~700W..
You should be fine on power, given it's a quality PSU.

http://extreme.outervision.com/PSUEngine
post #6 of 19
2 in crossfire mode will do everything you want 3 is overkill...but then again...this is OCN thumb.gif

you should be fine hardware wise....i believe you even have enough connectors for tri fire on that psu
Edited by mrinnocent - 1/8/12 at 9:14pm
easyfps
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD 1100T @4.3 3120cpu/nb 24/7 ASRock 890FX DELUXE5 2 X Powercolor HD6950 2g @1000/1425 Ripjaw 6-9-6-1T @ 1920 
Hard DriveHard DriveCoolingCooling
OCZ Vertex2 SSD WDC WD500 XSPC 750 RS360  Heatkiller GPU-X3 
OSMonitorPowerCase
Win 7 Ultimate 64 Acer 23 backlit led Antec 750w Rosewill ARMOR 
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easyfps
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD 1100T @4.3 3120cpu/nb 24/7 ASRock 890FX DELUXE5 2 X Powercolor HD6950 2g @1000/1425 Ripjaw 6-9-6-1T @ 1920 
Hard DriveHard DriveCoolingCooling
OCZ Vertex2 SSD WDC WD500 XSPC 750 RS360  Heatkiller GPU-X3 
OSMonitorPowerCase
Win 7 Ultimate 64 Acer 23 backlit led Antec 750w Rosewill ARMOR 
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post #7 of 19
I run 3 cards and I have no issues at all. Also your psu is WAY more than enough.
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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post #8 of 19
Thread Starter 
Yea xfx is going to replace my 5870 with a 1gb model of the 6850. So I wanted to crossfire it, and better tri fire. But I don't know if the performance will differ much from dual and tri
post #9 of 19
ati scales very well so you will see a nice difference from 2 to 3 cards.
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
  hide details  
Reply
    
CPUMotherboardGraphicsRAM
i7 2600k 5000mhz(so far) ASUS MAXIMUS IV EXTREME msi 6970 and 2 6950's Mushkin Enhanced Blackline 2133mhz 
Hard DriveOptical DriveOSMonitor
Force GT(os) M4 64gb(games) f3 1tb(other) Samsung Windows 7 64bit Samsung BX2450 
KeyboardPowerCaseMouse
Black widow XFX ProSeries 1050W PSU 80+Gold  Corsair 700D Deathadder 
Mouse Pad
nope! 
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Reply
post #10 of 19
so are you getting a 6850 or 6950?.....your first post says 6950...but then you said 6850...
easyfps
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD 1100T @4.3 3120cpu/nb 24/7 ASRock 890FX DELUXE5 2 X Powercolor HD6950 2g @1000/1425 Ripjaw 6-9-6-1T @ 1920 
Hard DriveHard DriveCoolingCooling
OCZ Vertex2 SSD WDC WD500 XSPC 750 RS360  Heatkiller GPU-X3 
OSMonitorPowerCase
Win 7 Ultimate 64 Acer 23 backlit led Antec 750w Rosewill ARMOR 
  hide details  
Reply
easyfps
(16 items)
 
  
CPUMotherboardGraphicsRAM
AMD 1100T @4.3 3120cpu/nb 24/7 ASRock 890FX DELUXE5 2 X Powercolor HD6950 2g @1000/1425 Ripjaw 6-9-6-1T @ 1920 
Hard DriveHard DriveCoolingCooling
OCZ Vertex2 SSD WDC WD500 XSPC 750 RS360  Heatkiller GPU-X3 
OSMonitorPowerCase
Win 7 Ultimate 64 Acer 23 backlit led Antec 750w Rosewill ARMOR 
  hide details  
Reply
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