Stable GPU OC

[GirlFromYonder]

I tried to run my R9 380 at 1200 MHz core 1550 memory at +200mV. The temps werent even 60 when the gpu crashed. So isthis because of to my stress or what?

[Energycore]

2 minutes ago, DeezNoNos said:

I tried to run my R9 380 at 1200 MHz core 1550 memory at +200mV. The temps werent even 60 when the gpu crashed. So isthis because of to my stress or what?

An overclock doesn't just become unstable because of temps. A lot of the time, too high a clockspeed means that the chip doesn't have time to complete an instruction on the GPU or load a parameter from the memory. Increasing voltage will allow you to reach a higher clockspeed because it's increasing the energy of each transistor as it changes states, which allows it to change faster.

 

This is a very basic notion of how a chip works. You can learn more about it in this slightly dated guide:

 

How Overvolting Works, The Dangers of Overvolting, and "Safe" Overvolting Technique | Overclockers Forums

[GirlFromYonder]

4 minutes ago, Energycore said:

An overclock doesn't just become unstable because of temps. A lot of the time, too high a clockspeed means that the chip doesn't have time to complete an instruction on the GPU or load a parameter from the memory. Increasing voltage will allow you to reach a higher clockspeed because it's increasing the energy of each transistor as it changes states, which allows it to change faster.

 

This is a very basic notion of how a chip works. You can learn more about it in this slightly dated guide:

 

How Overvolting Works, The Dangers of Overvolting, and "Safe" Overvolting Technique | Overclockers Forums

Nother question: right now my gpu is at 50C oced to 1201 and memeory 1500. But my clock speeds are at 500 mhz running valley benchmark.

[Energycore]

Just now, DeezNoNos said:

Nother question: right now my gpu is at 50C oced to 1201 and memeory 1500. But my clock speeds are at 500 mhz running valley benchmark.

That's because when your driver crashes, it defaults to the 2D profile to prevent further damage. Rebooting the computer (and thus reloading the driver) will solve that.

[GirlFromYonder]

Just now, Energycore said:

That's because when your driver crashes, it defaults to the 2D profile to prevent further damage. Rebooting the computer (and thus reloading the driver) will solve that.

i did reboot

[Lays]

12 minutes ago, Energycore said:

An overclock doesn't just become unstable because of temps.

 

Completely untrue, you can cool a card better, not increase the voltage whatsoever. 99% of the time it will be able to run at a higher clock speed, this is part of the reason why extreme cooling methods provide huge clock speed increases, not just because of the extra voltage.

 

Even just going from air cooling to water will likely net better clock speeds, with the SAME voltages.  I believe the scientific term is "Thermal noise" and the hotter the component runs, the more thermal noise it creates, this can affect clock speeds IIRC. TiN & K|ngp|n have talked about this a few times in their forum.

[Energycore]

Just now, Lays said:

 

Completely untrue, you can cool a card better, not increase the voltage whatsoever, and it will be able to run at a higher clock speed, this is part of the reason why extreme cooling methods provide huge clock speed increases, not just because of the extra voltage.

 

Even just going from air cooling to water will likely net better clock speeds, with the SAME voltages.

The negation of my statement "An overclock doesn't just become unstable because of temps" is "An overclock can only become unstable because of temps". Which is absolutely not true. So by the rules of classic logic (none of that intuitionist stuff), that means that the opposite, therefore my statement, must be true.

[Energycore]

2 minutes ago, DeezNoNos said:

i did reboot

That's interesting and I haven't had that happen yet. Try resetting the overclock to stock, then fire up valley to see if it clocks up to speed.

 

If you're overclocking through AMD's catalyst software, I recommend using another software like the Rivatuner based Afterburner.

 

https://gaming.msi.com/features/afterburner

[GirlFromYonder]

Just now, Energycore said:

That's interesting and I haven't had that happen yet. Try resetting the overclock to stock, then fire up valley to see if it clocks up to speed.

 

If you're overclocking through AMD's catalyst software, I recommend using another software like the Rivatuner based Afterburner.

 

https://gaming.msi.com/features/afterburner

i use sapphire trixx. But if there is another which allows me to increase my voltage even more i will go that way

[Energycore]

Just now, DeezNoNos said:

i use sapphire trixx. But if there is another which allows me to increase my voltage even more i will go that way

If you're going to increase voltage past +200mV, please read the guide I linked. There's a certain point where voltage starts hitting diminishing returns and increasing it past that point will yield worse performance/stability. If you're willing to tinker, it can be quite fun but please be careful

 

First thing though, make sure you can run at full speeds at stock. If you run into trouble I'll be here.

[GirlFromYonder]

2 minutes ago, Energycore said:

If you're going to increase voltage past +200mV, please read the guide I linked. There's a certain point where voltage starts hitting diminishing returns and increasing it past that point will yield worse performance/stability. If you're willing to tinker, it can be quite fun but please be careful

 

First thing though, make sure you can run at full speeds at stock. If you run into trouble I'll be here.

Well i managed to get to full speeds with furmark but my fps is 20??

[Energycore]

1 minute ago, DeezNoNos said:

Well i managed to get to full speeds with furmark but my fps is 20??

Both AMD and Nvidia throttle their cards down when facing furmark, because it's known to kill graphics cards

 

You can test stability with Heaven/Valley/Firestrike just fine. A graphically taxing game like Witcher 3 will do too, that's what i've been stress testing with these days.

 

So go ahead and see if you're getting normal performance out of some other benchmarks.

[GirlFromYonder]

2 minutes ago, Energycore said:

Both AMD and Nvidia throttle their cards down when facing furmark, because it's known to kill graphics cards

 

You can test stability with Heaven/Valley/Firestrike just fine. A graphically taxing game like Witcher 3 will do too, that's what i've been stress testing with these days.

 

So go ahead and see if you're getting normal performance out of some other benchmarks.

ok thank you