Help with overclock. (Stability problems) (GPU)

JwvdM · Aug 18, 2013

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.

legendkiller · Aug 18, 2013

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...

Novuake · Aug 18, 2013

legendkiller :

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.

legendkiller · Aug 18, 2013

Novuake :

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.

JwvdM · Aug 18, 2013

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

Novuake · Aug 18, 2013

legendkiller :

Novuake :

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.

Novuake · Aug 18, 2013

JwvdM :

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.

legendkiller · Aug 18, 2013

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.

JwvdM · Aug 19, 2013

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?

legendkiller · Aug 19, 2013

JwvdM :

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...

Novuake · Aug 19, 2013

legendkiller :

JwvdM :

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.

Novuake · Aug 19, 2013

JwvdM :

Yep, that is correct, and you can OC memory AFTER core clock.

JwvdM · Aug 19, 2013

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!!!

Novuake · Aug 19, 2013

JwvdM :

0.05V

NOT 0.005V.

JwvdM · Aug 19, 2013

Woops!
Thanks!

JwvdM · Aug 19, 2013

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?

Novuake · Aug 19, 2013

JwvdM :

Yep.

JwvdM · Aug 20, 2013

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 )

Novuake · Aug 20, 2013

Give it some more and see. You are still way in the safe zone for voltages.

JwvdM · Aug 23, 2013

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.

Novuake · Aug 23, 2013

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.

Help with overclock. (Stability problems) (GPU)

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