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Horizontal green lines when overclocking HD6950 CF

post #1 of 3
Thread Starter 
So I've just flashed my two watercooled HD6950s with the modded BIOS by
W1zzard, which only touches the shaders, and makes it possible to manage voltages. But when I'm using MSI Afterburner to overclock the cards past 950/1375 (on 1.175v) the system crashes with green horizontal lines. And I need to turn the power on/off to restore the system.

Note: I have disabled the ULPS, so that isn't the issue.
Neither are temperatures since the cards are watercooled with two
EK FC6970s. During FurMark I get 42 celcius on the Xtreme Burning test tops.

Tbh I want to get above 1000/1500. I did try these options with 1.29v, but the screen just went black before the FurMark (Multi-GPU) stability test started in Fullscreen.

Please help me with this overclock!

Thanks a lot in advance!
Black Mesa
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 5930K @ 4.4 GHz 1.275v Asus Rampage V Extreme ASUS Strix 1080 Ti @ 2050 / 11750 4x4GB DDR4 2800Hz Corsair Dominator Platinum 
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Philips Fidelio X1 AKG K7XX 
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Black Mesa
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 5930K @ 4.4 GHz 1.275v Asus Rampage V Extreme ASUS Strix 1080 Ti @ 2050 / 11750 4x4GB DDR4 2800Hz Corsair Dominator Platinum 
Hard DriveHard DriveCoolingOS
Samsung 950 Pro M.2 NVMe 512GB 2x OCZ Vertex 4 256GB NZXT Kraken X62 /w 4x Noctua NF-A14 PWM Windows 10 Pro x64 
MonitorMonitorKeyboardPower
Asus VG248QE 144Hz 1080p BenQ XL2410T 120Hz 1080p Corsair K70 RGB MX Brown Seasonic Prime 750w Titanium 
CaseMouseMouse PadAudio
NZXT H440 NE Black /w Window Logitech G500s Corsair MM200 XL Asus Essence One 
AudioAudio
Philips Fidelio X1 AKG K7XX 
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post #2 of 3
Sounds like you're pushing the cards over their limit, regardless of the temps being fine. Are you getting the same lines/crashing when they are clocked lower? If you aren't, then you know the problem.

Could also be a bad BIOS flash.
post #3 of 3
Thread Starter 
So the limits are 950/1375 ?
Black Mesa
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 5930K @ 4.4 GHz 1.275v Asus Rampage V Extreme ASUS Strix 1080 Ti @ 2050 / 11750 4x4GB DDR4 2800Hz Corsair Dominator Platinum 
Hard DriveHard DriveCoolingOS
Samsung 950 Pro M.2 NVMe 512GB 2x OCZ Vertex 4 256GB NZXT Kraken X62 /w 4x Noctua NF-A14 PWM Windows 10 Pro x64 
MonitorMonitorKeyboardPower
Asus VG248QE 144Hz 1080p BenQ XL2410T 120Hz 1080p Corsair K70 RGB MX Brown Seasonic Prime 750w Titanium 
CaseMouseMouse PadAudio
NZXT H440 NE Black /w Window Logitech G500s Corsair MM200 XL Asus Essence One 
AudioAudio
Philips Fidelio X1 AKG K7XX 
  hide details  
Reply
Black Mesa
(18 items)
 
  
CPUMotherboardGraphicsRAM
i7 5930K @ 4.4 GHz 1.275v Asus Rampage V Extreme ASUS Strix 1080 Ti @ 2050 / 11750 4x4GB DDR4 2800Hz Corsair Dominator Platinum 
Hard DriveHard DriveCoolingOS
Samsung 950 Pro M.2 NVMe 512GB 2x OCZ Vertex 4 256GB NZXT Kraken X62 /w 4x Noctua NF-A14 PWM Windows 10 Pro x64 
MonitorMonitorKeyboardPower
Asus VG248QE 144Hz 1080p BenQ XL2410T 120Hz 1080p Corsair K70 RGB MX Brown Seasonic Prime 750w Titanium 
CaseMouseMouse PadAudio
NZXT H440 NE Black /w Window Logitech G500s Corsair MM200 XL Asus Essence One 
AudioAudio
Philips Fidelio X1 AKG K7XX 
  hide details  
Reply
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