GTX 1080 volt issues past 1.25v

[r3h4f]

4 minutes ago, IcEWoLF said:

A stock 1080 is much better than the 980 gtx ti overclocked, if you are thinking about getting a plain 980 don't, get the 1070 which is very good.

Thanks for the quick reply!

probs will get the 1070 when the AIBs release. really want a 1080 but its like £600ish

[Curufinwe_wins]

5 minutes ago, r3h4f said:

Thanks for the quick reply!

probs will get the 1070 when the AIBs release. really want a 1080 but its like £600ish

The OC 'ability of the 980ti is only really super relevant on LN2 or Dice (compared to the 1080). Outside of that, the stock 1080 is right on par with a OC'd 980ti although the 980ti is drawing like 100W more.

 

Honestly 1070 vs 980ti is a straight win for the 980ti right now (again ignoring power differences, which is admittedly a big deal).

[r3h4f]

3 minutes ago, Curufinwe_wins said:

The OC 'ability of the 980ti is only really super relevant on LN2 or Dice. Outside of that, the stock 1080 is right on par with a OC'd 980ti although the 980ti is drawing like 100W more.

 

Honestly 1070 vs 980ti is a straight win for the 980ti right now (again ignoring power differences, which is admittedly a big deal).

considering a 1070 and a used 980ti is going to be round the same here round £350, i think its just more reason to save up. *sigh*,

also, i guess the 1070 would also have this 1.25v limit as well right?

 

[Dackzy]

2 minutes ago, r3h4f said:

considering a 1070 and a used 980ti is going to be round the same here round £350, i think its just more reason to save up. *sigh*,

also, i guess the 1070 would also have this 1.25v limit as well right?

 

Yeah there is a very big chance that it will also have the 1.25v limet

[Guest]

This is exactly why I'm waiting to see if I should even bother getting a 1080 right now.

 

[Lays]

Good news boys, LN2 2500 mhz on a HOF 1080 at 1.39v, seems they found the secret sauce somewhere to get voltage working properly.

 

Still slower than the top 980 ti's on LN2, but still good nonetheless!

 

 The score is about even with a ~2025 mhz 980 ti on Ln2.  The top 980 ti are capable of ~2100-2220 mhz at 1.75-1.85v i believe.  So the 1080 still needs to get a bit faster to catch up.

 

 

 

 

 

 

 

[Vellinious]

But on water, for every day usage, like most of us here do, the 1080 is faster than the 980ti.  Got it. 

[Lays]

1 minute ago, Vellinious said:

But on water, for every day usage, like most of us here do, the 1080 is faster than the 980ti.  Got it. 

yessir, 24/7 use the 1080 is faster. On Ln2 / dry ice, 980 ti should be faster.  (as of right now)

[VagabondWraith]

Good stuff @Lays I think they'll figure it all out as time goes on. Here's hoping they break the 3GHz barrier.

[bandage106]

Damn Lays you beat me to it. Was just gonna hop back to this thread and post some updates on the status of things.  Anyway this is what TiN had to say. 

 

Voltage scaling and “1.25V limit”

There were some rumors spreading wildly these days regarding “1.25V limitation” or whatever on modified GTX 1080 cards, which requires here few words to explain.

Hardware itself is well capable of getting to that and above voltage output for GPU core, but GP104 chip itself now more sensitive to voltage, than even previous Maxwell generation. Part of it due to thinner physical process, other part due to challenges removing heat from all those tightly packed 7.2B transistors quick enough from 21% less surface area. Those overclockers who did 2200+ MHz on GTX 980 Ti’s are well aware of all things required to achieve those high clocks. Same principle applies to Pascal generation. So if you can manage to keep GPU cooled well and have good voltage delivery to it, you indeed can push higher voltages. Cards cooled by liquid nitrogen during this guide testwork were able to run 1.35-1.4V, reaching speeds over 2500 MHz.

Fact that GTX 1080’s capable of reaching 2.1GHz on aircooling without any modifications confuse lot of people, making them to think that these chips can overclock well past 3GHz on liquid nitrogen cooling. But it’s still silicon, with similar architecture, so reality is bit sour. Yes, it allow to get good performance without extreme cooling, but hides the fact that LN2-cooled 980Ti is still much faster than overclocked GTX 1080 due to more shader cores and better CPC performance.

This also brings and answer to the question if overvolting can help OC on aircooling or watercooling. It does not help, due to thermal, which get only worse. Higher temperature render stability and performance decrease. GPU literally overheats and cannot run high frequency anymore, even though temperature is below specified maximum temperature. So just like in 980/980Ti/TitanX case, over-voltage is not recommended, as it gains no performance improvement.

As usual, any feedback and questions are appreciated. Feel free to share link to this guide, but keep links and references intact, as guide likely to be updated in future.

[Vellinious]

21 minutes ago, Lays said:

yessir, 24/7 use the 1080 is faster. On Ln2 / dry ice, 980 ti should be faster.  (as of right now)

I still think there's a chance that'll change with driver updates, and better hardware, but.....we'll see.  /shrug

[stconquest]

 

[Energycore]

I've an idea of why this might be. Take a look at http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1070/4.html

 

They've included an all new voltage regulator chip. Perhaps that one caps at 1.25v