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Can't overclock very well with crossfire 5750's

post #1 of 4
Thread Starter 
Hi Guys,

I have 2 5750's running in crossfire. As single cards they both run stable at 850/1300 so I wanna run them at this speed in crossfire.

However I can not get them stable above stock. Even a 30+mhz increase causes them to crash when gaming. Memory clocks, however, seem to be stable. I have tried all I can think of, flashing to same BIOS, switching the cards around and running the rest of the system at stock.

Any ideas? I may try doing a pencil mod on both the cards to see if this helps. Maybe raising SB volts will help?
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My Rig
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CPUMotherboardGraphicsRAM
Phenom II X4 970T @ X6 LAPPED ASUS M4A785TD-V EVO XFX REF HD 6870 (1000/1200/1.26) 2x2gb DDR3 Kingston Vapor-X 1600mhz CL9 
Hard DriveOSMonitorKeyboard
Crucial M4 64gb SSD + 640gb WD Windows 8 x64 22" 1080p LG flatron MS wired 600 
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post #2 of 4
I too cannot overclock high only when the cards are in crossfire. except voltage increases there is nothing you can really do.
X79-GCN
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X79-GCN
(22 items)
 
  
CPUMotherboardGraphicsRAM
Intel 3930K 4.5GHz HT GIGABYTE GA-X79-UP4 AMD R9-290X GEil Evo Potenza DDR3 2400MHz CL10 (4x4GB) 
Hard DriveCoolingCoolingCooling
Samsung 840 Pro 120GB EK Supremacy (CPU) NF F12's P/P (360 Rad)  NF A14's (420 Rad)  
CoolingCoolingCoolingCooling
XSPC Chrome Compression Fittings EK RES X3 150 Primochill PremoFlex Advanced LRT Clear 1/2 ID EK-FC (R9 290X) 
CoolingCoolingCoolingOS
EK D5 Vario Top-X  Phobya G-Changer V2 360mm Phobya G-Changer V2 420mm Win 10 x64 Pro 
MonitorKeyboardPowerCase
BenQ XR3501 35" Curved Corsair Vengeance K90 Seasonic X-1250 Gold (v2) Corsair 900D 
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Logitech G400s Senn HD 598 
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post #3 of 4
Thread Starter 
Hmmm ok so which voltage should I increase? The SB, master GPU vcore, slave card GPU vcore or both GPUs?
My Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 970T @ X6 LAPPED ASUS M4A785TD-V EVO XFX REF HD 6870 (1000/1200/1.26) 2x2gb DDR3 Kingston Vapor-X 1600mhz CL9 
Hard DriveOSMonitorKeyboard
Crucial M4 64gb SSD + 640gb WD Windows 8 x64 22" 1080p LG flatron MS wired 600 
PowerCaseMouse
900w Modular Inwin CM Storm Sentinel 
  hide details  
Reply
My Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 970T @ X6 LAPPED ASUS M4A785TD-V EVO XFX REF HD 6870 (1000/1200/1.26) 2x2gb DDR3 Kingston Vapor-X 1600mhz CL9 
Hard DriveOSMonitorKeyboard
Crucial M4 64gb SSD + 640gb WD Windows 8 x64 22" 1080p LG flatron MS wired 600 
PowerCaseMouse
900w Modular Inwin CM Storm Sentinel 
  hide details  
Reply
post #4 of 4
Thread Starter 
Ok I have tried increasing southbridge and both GPU vcores with not much change. Any other ideas? I know most people can run these with normal overclocks.
My Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 970T @ X6 LAPPED ASUS M4A785TD-V EVO XFX REF HD 6870 (1000/1200/1.26) 2x2gb DDR3 Kingston Vapor-X 1600mhz CL9 
Hard DriveOSMonitorKeyboard
Crucial M4 64gb SSD + 640gb WD Windows 8 x64 22" 1080p LG flatron MS wired 600 
PowerCaseMouse
900w Modular Inwin CM Storm Sentinel 
  hide details  
Reply
My Rig
(13 items)
 
  
CPUMotherboardGraphicsRAM
Phenom II X4 970T @ X6 LAPPED ASUS M4A785TD-V EVO XFX REF HD 6870 (1000/1200/1.26) 2x2gb DDR3 Kingston Vapor-X 1600mhz CL9 
Hard DriveOSMonitorKeyboard
Crucial M4 64gb SSD + 640gb WD Windows 8 x64 22" 1080p LG flatron MS wired 600 
PowerCaseMouse
900w Modular Inwin CM Storm Sentinel 
  hide details  
Reply
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