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6870 + 6850 on my rig

post #1 of 2
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Im assuming these cards will run together, but what kind of performance increases am I likely to see? I think my motherboard would only support 8x link for each card.
    
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Phenom 2 955BE Gigabyte MA790X-UD4P Sapphire Radeon HD6870 4GB OCZ Gold DDR2 8500 
Hard DriveOptical DriveOSMonitor
WD Black 640GB Asus Windows 7 x64 AOC 2436Vw + AOC 2216Vw 
KeyboardPowerCaseMouse
Genius Slimstar 335 Huntkey Jumper 550 CoolerMaster HAF 922 Logitech G500 
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Steelseries Qck 
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post #2 of 2
they will work together but you lose performance by using 2 diff cards... around 10 percent plus extra cpu load

better to use 2x 6850 or 2x 6870

in games that support crossfire properly you will see your frame rates pretty much double... the 68xx has the best scaling of all the amd cards. 2 of them are faster than any single gpu card available
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CPUMotherboardGraphicsRAM
Xeon E3-1220 v5 Asrock E3V5 Performance gaming/oc Asus ROG 1070 2x16 gb 3200mhz corsair white dominators 
Hard DriveHard DriveHard DriveOptical Drive
BX100 250gb Plextor M6e black edition 256gb 12tb Unraid NAS none 
CoolingOSMonitorKeyboard
Kraken X61 Win 10 Pro qnix 27 inch OC to 120hz Logitech G105 
PowerCaseMouseMouse Pad
EVGA 850 B2 Lian-Li K62BW Logitech G502 AT&T corporate 
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Realtek Optical Out 
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