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Help with unstable HD7950 Vapor-X OC

post #1 of 3
Thread Starter 
Hi All, Bit of an OCing Noob.

Comp specs:

CPU:i5-3570
GPU: Sapphire HD7950 Vapor-X w Boost
Mobo:Gigabyte H77M-D3H
PSU: Antec 520W High Current Gamer (Could this be insufficient?)
Ram: 2x4GB Corsair Vengeance
Case: Fractal Design Define r4
HDD: Seagate Barracuda 2TB
SDD: Samsung 840 Series 120GB
OS: Windows 7 64 bit
Using AMD 13.6 drivers

2 months ago I overclocked my Sapphire HD7950 Vapor-x to 1100 core/1400 mem at stock voltage, using the AMD CCC with power +20.

Ran Unigine and everything seemed fine. Temp stabilizes at 59 core 62-63 Vrm at full load and I do not notice any artifacts.

However when I play certain games within half an hour or so the monitor will randomly lose signal and I will be forced to reboot my computer. The game seems to continue to "play" and I will still have in game sound.

When I restart my computer my GPU will have reset itself to stock speeds. Removing my OC stops this problem from happening.

The weird thing is that this seems to be happening in games which do not even stress my GPU (for example happens in Mass Effect, Mirror's Edge, Bioshock 1 etc). Yet I have played games like Crysis 3, Bioshock Infinite etc without any problems.

As alluded to above it doesn't appear to be related to temps or load. It happens frequently in Mirror's Edge for example where my GPU is at 30% load and 40c.

Not really sure what is going on as other users on this forum seemed to have managed to bench far higher then me with this card without encountering any issues, even at stock voltages.

Ideally I want to run a 24/7 overclock and I am hesitant to increase the voltage (not sure if this will do much anyway as when using Trixx it registers my voltage at 1.25V already?)

Any help is appreciated smile.gif
post #2 of 3
Quote:
Originally Posted by alwaystipsadraw View Post

Hi All, Bit of an OCing Noob.

Comp specs:

CPU:i5-3570
GPU: Sapphire HD7950 Vapor-X w Boost
Mobo:Gigabyte H77M-D3H
PSU: Antec 520W High Current Gamer (Could this be insufficient?)
Ram: 2x4GB Corsair Vengeance
Case: Fractal Design Define r4
HDD: Seagate Barracuda 2TB
SDD: Samsung 840 Series 120GB
OS: Windows 7 64 bit
Using AMD 13.6 drivers

2 months ago I overclocked my Sapphire HD7950 Vapor-x to 1100 core/1400 mem at stock voltage, using the AMD CCC with power +20.

Ran Unigine and everything seemed fine. Temp stabilizes at 59 core 62-63 Vrm at full load and I do not notice any artifacts.

However when I play certain games within half an hour or so the monitor will randomly lose signal and I will be forced to reboot my computer. The game seems to continue to "play" and I will still have in game sound.

When I restart my computer my GPU will have reset itself to stock speeds. Removing my OC stops this problem from happening.

The weird thing is that this seems to be happening in games which do not even stress my GPU (for example happens in Mass Effect, Mirror's Edge, Bioshock 1 etc). Yet I have played games like Crysis 3, Bioshock Infinite etc without any problems.

As alluded to above it doesn't appear to be related to temps or load. It happens frequently in Mirror's Edge for example where my GPU is at 30% load and 40c.

Not really sure what is going on as other users on this forum seemed to have managed to bench far higher then me with this card without encountering any issues, even at stock voltages.

Ideally I want to run a 24/7 overclock and I am hesitant to increase the voltage (not sure if this will do much anyway as when using Trixx it registers my voltage at 1.25V already?)

Any help is appreciated smile.gif

I got a Vapor-X running 1130/1700 mhz for daily use. Voltage set in trixx is 1,231 volt for core and 1,6 volt for memory. I use Trixx 4.4 modded version for memory voltage control. Remember to set the card on the non boost bios for voltage control. My card runs 1200 mhz on core also without probs. For that i need 1,275 volt in trixx which means around 1,190 volt after v-drop.
post #3 of 3
Thread Starter 
Hey, I have been using Trixx 4.6.0 with the boost bios on. This seems to allow me to control the core voltage but not the voltage for the mem.

Besides unlocking the mem voltage is there any other advantages from using the non-boost bios?

My problem appears to be most people can run this card with these clocks at stock voltage but I am having trouble.

Could it be a problem related to my power supply?

Should I try fixing constant voltage?

For reference as I didn't include it in the OP this is my card: http://www.amazon.com/Sapphire-DL-DVI-I-SL-DVI-D-PCI-Express-11196-09-40G/dp/B009MML1UA
Edited by alwaystipsadraw - 6/4/13 at 4:35pm
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