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Help with overclock. (Stability problems) (GPU)

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August 18, 2013 1:38:23 PM

Hello,

I am new to overclock.
I have first overclocked my cpu, the vishera fx-6300.
This was a succes.

Now i realy want to overclock my GPU, Sapphire HD7850oc 2GB.
(Stock : 920/1250 1,138 volt)

The problem that i have is the following:
When i have my settings on 1120/1250 stock volts, and i run the furmark test with the screen resolution of 1920:1080 ( full screen ) for like 10 min, it is stable and wont get hotter than 65.

When i test it on MSI konbustor with same settings it crashes, but not when i have te settings on 1100/1250 stock volts.

Than with these settings if i run heaven benchmark it crashes after like 1 or 3 seconds.
Also when i test it in a game it crashes.

I don't know why, and i don't know what to do right now.
I realy want to overclock my GPU.

Hope Someone Can Help me.
a b K Overclocking
August 18, 2013 1:49:16 PM

Furmark is just more of GPU Temperature, Konbustor is more toward stability. Get HIGHEST VOLTAGE POSSIBLE, dont leave it at stock, i mean it's a no brainier leaving it at stock voltage and overclocking... ge tthe highest voltage available on MSI Afterburner and OC...
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a c 129 K Overclocking
August 18, 2013 1:57:03 PM

legendkiller said:
Furmark is just more of GPU Temperature, Konbustor is more toward stability. Get HIGHEST VOLTAGE POSSIBLE, dont leave it at stock, i mean it's a no brainier leaving it at stock voltage and overclocking... ge tthe highest voltage available on MSI Afterburner and OC...


NO!!!! ONLY use as much voltage as needed! Geez dude! You should REALLY not say stuff like that.

DO NOT use MSI Kombuster or Furmark, they can potentially damage cards.
Use real world benches like Unique Heaven and 3D mark 11.
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a b K Overclocking
August 18, 2013 2:10:20 PM

Novuake said:
legendkiller said:
Furmark is just more of GPU Temperature, Konbustor is more toward stability. Get HIGHEST VOLTAGE POSSIBLE, dont leave it at stock, i mean it's a no brainier leaving it at stock voltage and overclocking... ge tthe highest voltage available on MSI Afterburner and OC...


NO!!!! ONLY use as much voltage as needed! Geez dude! You should REALLY not say stuff like that.

DO NOT use MSI Kombuster or Furmark, they can potentially damage cards.
Use real world benches like Unique Heaven and 3D mark 11.


Who would OC and use 0.01v?
There's a limit and it's not even close to the max. Limit: 1.16v Max 1.21v(bios mod) anything over 1.21v would be a problem.
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August 18, 2013 2:12:10 PM

Okay, so i will only use heaven to test stability.
What is the best way to get a high and stable overclock?
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a c 129 K Overclocking
August 18, 2013 2:12:40 PM

legendkiller said:
Novuake said:
legendkiller said:
Furmark is just more of GPU Temperature, Konbustor is more toward stability. Get HIGHEST VOLTAGE POSSIBLE, dont leave it at stock, i mean it's a no brainier leaving it at stock voltage and overclocking... ge tthe highest voltage available on MSI Afterburner and OC...


NO!!!! ONLY use as much voltage as needed! Geez dude! You should REALLY not say stuff like that.

DO NOT use MSI Kombuster or Furmark, they can potentially damage cards.
Use real world benches like Unique Heaven and 3D mark 11.


Who would OC and use 0.01v?
There's a limit and it's not even close to the max. Limit: 1.16v Max 1.21v(bios mod) anything over 1.21v would be a problem.


What are you saying?
I use increments of 0.05v.
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a c 129 K Overclocking
August 18, 2013 2:15:17 PM

JwvdM said:
Okay, so i will only use heaven to test stability.
What is the best way to get a high and stable overclock?


Get to the max OC you can get on stock voltage, then increase voltage by 0.05v and increase clock rate as much as possible.
Alternate between voltage and clock increases to keep the card stable. Stress test after each increase.

This is the SAFEST way to overclock and best way to find a ceiling for any graphics card available.
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a b K Overclocking
August 18, 2013 2:42:32 PM

BTW, dont test your GPU 24 hours, if you do your GPU will die in a couple of days... GPUs are not meant to be running 99%/100% very long and if it does it'll get destroyed. run test for like 10 minutes or 20 minutes.
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August 19, 2013 12:32:47 AM

Do i only have to add core clock?

So i will do the following:
Increase the core clock, and test stability.
Again increase the core clock and test the stability again. ( on and on untill i have reached the ceilling. )
Than i will add 0.005v, and repeat the 2 steps above.

This will all be repeated untill it is stable with a max temperature at like ... 70 degrees?

But the first couple of test should be round the 10 or 20 min.
Don't the last test ( when you pusht it really far ) needs to be like and hour?
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a b K Overclocking
August 19, 2013 6:01:45 AM

JwvdM said:
Do i only have to add core clock?

So i will do the following:
Increase the core clock, and test stability.
Again increase the core clock and test the stability again. ( on and on untill i have reached the ceilling. )
Than i will add 0.005v, and repeat the 2 steps above.

This will all be repeated untill it is stable with a max temperature at like ... 70 degrees?

But the first couple of test should be round the 10 or 20 min.
Don't the last test ( when you pusht it really far ) needs to be like and hour?


Dont just do core clock, OC the shader and memory, Core/Shader/Memory clock are what makes the car run faster, making one part of the three run faster is just meaningless meaning you wont notice the difference until you OC your memory and shaders with the core clock...
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a c 129 K Overclocking
August 19, 2013 6:11:04 AM

legendkiller said:
JwvdM said:
Do i only have to add core clock?

So i will do the following:
Increase the core clock, and test stability.
Again increase the core clock and test the stability again. ( on and on untill i have reached the ceilling. )
Than i will add 0.005v, and repeat the 2 steps above.

This will all be repeated untill it is stable with a max temperature at like ... 70 degrees?

But the first couple of test should be round the 10 or 20 min.
Don't the last test ( when you pusht it really far ) needs to be like and hour?


Dont just do core clock, OC the shader and memory, Core/Shader/Memory clock are what makes the car run faster, making one part of the three run faster is just meaningless meaning you wont notice the difference until you OC your memory and shaders with the core clock...


Please be quiet... You have NO idea what you are saying.
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a c 129 K Overclocking
August 19, 2013 6:12:02 AM

JwvdM said:
Do i only have to add core clock?

So i will do the following:
Increase the core clock, and test stability.
Again increase the core clock and test the stability again. ( on and on untill i have reached the ceilling. )
Than i will add 0.005v, and repeat the 2 steps above.

This will all be repeated untill it is stable with a max temperature at like ... 70 degrees?

But the first couple of test should be round the 10 or 20 min.
Don't the last test ( when you pusht it really far ) needs to be like and hour?


Yep, that is correct, and you can OC memory AFTER core clock.
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August 19, 2013 8:39:55 AM

alright so , core +, memory +, volt +(0.005v), repeat...
And every increase needs a test with heaven.

Ill try in an hour, i have to eat first.

Thanks for the help!!! :D 
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a c 129 K Overclocking
August 19, 2013 8:41:57 AM

JwvdM said:
alright so , core +, memory +, volt +(0.005v), repeat...
And every increase needs a test with heaven.

Ill try in an hour, i have to eat first.

Thanks for the help!!! :D 


0.05V

NOT 0.005V.
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August 19, 2013 9:16:32 AM

Woops!
Thanks! :) 
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August 19, 2013 11:19:46 AM

I have these settings now :

Stock :
gpu clock - 920
memory clock - 1250
VDDC - 1138

OC:
gpu clock - 1080
memory clock - 1350
VDDC - 1138

I need to add voltage now,
So VDDC - 1138 wil need to be increased to 1188?
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a c 129 K Overclocking
August 19, 2013 11:22:43 AM

JwvdM said:
I have these settings now :

Stock :
gpu clock - 920
memory clock - 1250
VDDC - 1138

OC:
gpu clock - 1080
memory clock - 1350
VDDC - 1138

I need to add voltage now,
So VDDC - 1138 wil need to be increased to 1188?


Yep.
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August 20, 2013 2:40:21 PM

well, i have the card on 1140/1400/1188.
on heaven it runs good, no strange things happen no istabillity.

this morning i was playing far cry 3 for an half hour and it runs very good.

tonight i was playing 10 min and my screen freezes and runs black and i get the message my videocard wasn't working correct.
so, its unstable. but i dont understand, couse in heaven it was good and this morning it was good.

what do i need to do now?
increase volts again?

And how far can i go with the volts, can i max it out on 1225? ( if my temps stay below 70 degrees )
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a c 129 K Overclocking
August 20, 2013 2:46:23 PM

Give it some more and see. You are still way in the safe zone for voltages.
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August 23, 2013 12:07:18 AM

Is there a way to get past 1.225 volts or isnt that safe?
My gaming temp is 60 degrees i can go higher or is it best not to?

i have 1140/1400 1.225 right now this isnt a very good oc or is it? If i lower volts it crashes on 1140.
But maybe i can get the memory higher than 1400 didnt try yet.
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a c 129 K Overclocking
August 23, 2013 6:30:50 AM

Well I personally feel perfectly comfortable at 1.25, but that is me, I have never had issues with that setting on any card, so I would say give it more than 1.225.
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!