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Max safe 7950 Voltage while OCing

post #1 of 26
Thread Starter 
I have a PowerColor pcs+ radeon hd 7950. I have had a lot of luck using MSI afterburner for overclocking. My question is how high can I increase the voltage on the card while staying safe. It has a nice shroud so I don't have temp issues. I have no issues with running synthetic benchmarks like furmark, 3D mark, etc. But when I try to open a video game DX11 crashes. I clocked back down to stock and have no issues with DX11 and gaming.
My overclock:
Voltage: 1.2
Core clock: 1250 MHz
Mem clock: 1550 MHz

If anyone can help me I'd appreciate it. Thanks biggrin.gif Here's a link to my GPU-Z \/
http://www.techpowerup.com/gpuz/kyeu9/
post #2 of 26
You've got a nice card man!

I wouldn't go over 1.25v on air, personally, just stay below 75c max load and you'll be fine.

These cards are very heat sensitive, when I go over 75c core it can get unstable at clocks that run stable at say 67c and no amount of extra vddc helps when that happens.

I have a HIS 7950 IceQ X2 Turbo, I'm interested in the Powercolor 7970 AX, the one with dual fan. Seems like they do have some nice ocing cards!
What's your asic value in gpu-z?
post #3 of 26
Quote:
Originally Posted by yodazb View Post

I have a PowerColor pcs+ radeon hd 7950. I have had a lot of luck using MSI afterburner for overclocking. My question is how high can I increase the voltage on the card while staying safe. It has a nice shroud so I don't have temp issues. I have no issues with running synthetic benchmarks like furmark, 3D mark, etc. But when I try to open a video game DX11 crashes. I clocked back down to stock and have no issues with DX11 and gaming.
My overclock:
Voltage: 1.2
Core clock: 1250 MHz
Mem clock: 1550 MHz

If anyone can help me I'd appreciate it. Thanks biggrin.gif Here's a link to my GPU-Z \/
http://www.techpowerup.com/gpuz/kyeu9/

I ran my crossfire @ 1175/1550 - 1.250 volt 24/7 on water. Seems like you have a good oc'ng card....try to play games all day see what it does tongue.gif
    
CPUMotherboardGraphicsGraphics
i7 920 Evga X58 Classified LE Edition. Sapphire HD 7950 OC Edition Sapphire HD 7950 OC Edition 
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G skill Ripjaws 12 gb Samsung ssd 120 gb sata III WD Velociraptop 300 gb x 2 LG Blu ray drive 
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EK-FC7950 with EK-7950 Backplate FC8 30 watt per channel Bitspower fittings Feser 360 rad (Push Pull) 
CoolingCoolingCoolingCooling
XSPC 240 rad (Push Pull) Corsair SP 120 mm static x10 Corsair AF 120 mm  Bitspower 250 reservoir 
CoolingCoolingCoolingCooling
Heat killer 3.0 Koolance chipset water block EK-FC7950 with EK-7950 Backplate MCP35X2 with stand 
OSMonitorKeyboardPower
Windows 7 Ultimate Acer 27" x 3 (eyefinity) Logitech G510/CM Storm Mechanical Keyboard Seasonic 1250 watt X series with moddyi Cable set. 
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CaseLabs SM8 white ZowieAM Rocketfish Gamecon 780 
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CPUMotherboardGraphicsGraphics
i7 920 Evga X58 Classified LE Edition. Sapphire HD 7950 OC Edition Sapphire HD 7950 OC Edition 
RAMHard DriveHard DriveOptical Drive
G skill Ripjaws 12 gb Samsung ssd 120 gb sata III WD Velociraptop 300 gb x 2 LG Blu ray drive 
CoolingCoolingCoolingCooling
EK-FC7950 with EK-7950 Backplate FC8 30 watt per channel Bitspower fittings Feser 360 rad (Push Pull) 
CoolingCoolingCoolingCooling
XSPC 240 rad (Push Pull) Corsair SP 120 mm static x10 Corsair AF 120 mm  Bitspower 250 reservoir 
CoolingCoolingCoolingCooling
Heat killer 3.0 Koolance chipset water block EK-FC7950 with EK-7950 Backplate MCP35X2 with stand 
OSMonitorKeyboardPower
Windows 7 Ultimate Acer 27" x 3 (eyefinity) Logitech G510/CM Storm Mechanical Keyboard Seasonic 1250 watt X series with moddyi Cable set. 
CaseMouseMouse PadAudio
CaseLabs SM8 white ZowieAM Rocketfish Gamecon 780 
Audio
Bose 2.1 
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post #4 of 26
Slider all the way to 1.3V as long you can keep the temps at bay. It's not like it will reach 1.3V anyway due to vdroop. Also, don't bother with Furmark, it will most likely just throttle and won't give you any indication of true stability.
post #5 of 26
Quote:
Originally Posted by yodazb View Post

I have a PowerColor pcs+ radeon hd 7950. I have had a lot of luck using MSI afterburner for overclocking. My question is how high can I increase the voltage on the card while staying safe. It has a nice shroud so I don't have temp issues. I have no issues with running synthetic benchmarks like furmark, 3D mark, etc. But when I try to open a video game DX11 crashes. I clocked back down to stock and have no issues with DX11 and gaming.
My overclock:
Voltage: 1.2
Core clock: 1250 MHz
Mem clock: 1550 MHz

If anyone can help me I'd appreciate it. Thanks biggrin.gif Here's a link to my GPU-Z \/
http://www.techpowerup.com/gpuz/kyeu9/

i'd say vrm temps are more important than vcore. lower vrm temps you could possibly lower vcore too. i wouldnt go too much higher on air, but i'd say you could if you invest in some mosfet heatsinks like these http://www.enzotechnology.com/mos-c1.htm
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plextor m5 pro 128gb none water cooler master 1200w silent pro gold 
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new build
(9 items)
 
  
CPUMotherboardGraphicsRAM
4790k 5ghz 1.392v gigabyte z97 soc force 780ti classified skill ripjawz 
Hard DriveOptical DriveCoolingPower
plextor m5 pro 128gb none water cooler master 1200w silent pro gold 
Case
open air bench 
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post #6 of 26
Thread Starter 
So I guess when I get home I'll bump up to the 1.3V. I'll post up how it goes. Also at the moment I max out at 64 C under max load with the OC so far. Later tonight I'll probably replace the thermal paste on it with some AS5 and bump those voltages. Does this seem to be a pretty legit overclock for a first timer with GPU overclocking with out much help?
post #7 of 26
Don't touch the tim, seems like it's doing a good job.
What are your vrm temps?
post #8 of 26
Thread Starter 
Not sure atm. I'm not home right now. I'll check that later tonight. And what's the reasoning for not replacing the thermal paste?
Thanks, yodazb
post #9 of 26
Thread Starter 
I pushed it to 1.3V started up some BF3 max graphics 1920x1080 and it runs for about 1 minute then crashes. Any suggestions other then clocking down a bit to get this stable? Oh, and its max temps on BF3 was about 45 C.
Thanks, yodazb
post #10 of 26
Seeing you have so high ASIC (low leakage) on that card it's no wonder the extra voltage didn't help much.

Clock back down and enjoy the 24/7 goodness!
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