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[Twitter] Jen-Hsun introduces the new NVIDIA TITAN X - Page 266  

post #2651 of 3587
https://xdevs.com/guide/pascal_oc/
Quote:
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 +94°C. Think of it as temperature to frequency dependency, all the way down from +94°C to -196°C, with slope around 100MHz every 50°C. So just like in 980/980Ti/TitanX case, over-voltage on aircooling/watercooling is not recommended, as it gains little if any performance improvement.

Don’t get this message wrong, as GTX 1080/1070 are still great cards for daily gaming/content creation and VR experience. They are fast, not power hungry, moderately cool. The only catch is that overclocking them is not as fun and rewarding as it was on previous generations, even considering all tricks involved to get Maxwell clock high.

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.
post #2652 of 3587
Quote:
Originally Posted by Steven185 View Post

I would be interested to know where this 35% figure (compared to the last Titan x comes from). The official figure is 60%, while nvidia use tricks (for example they mean that that's the performance difference when everything is cranked up at 4k) they rarely straight up lie on promo stuff. Last time they did, they found trouble (GTX 970).
 

 

Quote:

Originally Posted by Murlocke View Post

I think anyone claiming 30-35% increase are talking about 1080 > Titan XP.

If the Titan X was only 30-35% faster than the last Titan, that'd put it right at 1080 performance for $500 more.

Correct I completely made a mistake on the comparison. Good catch both of you. when I compare 60% titan X to Titan XP I come up with $7.5 per FPS in the hypothetical scenario. Still fluff tho and doesn't mean anything.


Edited by Ghoxt - 8/1/16 at 9:30am
post #2653 of 3587
edit, nevermind. bad product page sad-smiley-002.gif
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post #2654 of 3587
Quote:
Originally Posted by magnek View Post

I don't think Titan XP uses binned chips, unless by binned you meant "failed Quadro specs". tongue.gif

The absolute best 1080s top out at around 2200 on air or water, which is 27% OC if we use nVidia's listed boost clock of 1733. Titan XP's listed boost clock is 1513 MHz, and 27% over that is 1922 MHz.

Plus the stock blower isn't exactly breaking any records when it comes to performance.

Percentage wise Tis/Titans always overclock better than non Titans. The card you have in your signature is 42% over boost while the best of 980s were around 30% over boost.

So if the 1080s can achieve 27% over boost it's far from a stretch to expect a Titan to achieve 34% over boost (2050Mhz) in fact it's almost expected...
post #2655 of 3587
Actually in-game boost clocks of 980 Ti and 980 were very comparable. Going by Anandtech's numbers, 980 Ti averaged 1156 across 10 games, while 980 averaged 1190 across 8 games.

It was also easier and more common for 980 to hit 1550 than it was for 980 Ti. So overall OC headroom was a wash.

Besides, I said >2GHz on air ie on that underpowered stock blower. I mean sure, if you don't mind running 100% fan 24/7 then it's possible.
post #2656 of 3587
Quote:
Originally Posted by magnek View Post

Actually in-game boost clocks of 980 Ti and 980 were very comparable. Going by Anandtech's numbers, 980 Ti averaged 1156 across 10 games, while 980 averaged 1190 across 8 games.

It was also easier and more common for 980 to hit 1550 than it was for 980 Ti. So overall OC headroom was a wash.

Besides, I said >2GHz on air ie on that underpowered stock blower. I mean sure, if you don't mind running 100% fan 24/7 then it's possible.

See? We don't know Titan XP's actual clocks during gaming, but we do know its stated boost clock over which a 33% increase is far from being far fetched even with its ... leaf blower. On water, I'm sure it will hit even the 2100 Mhz mark...

Oh well, it's just a few hours; better wait ... shall we?
post #2657 of 3587
Considering the stock cooling solution on the XP is probably the same as the 1080 and will be producing a lot more heat (Don't forget the extra memory modules and VRM's that need to be cooled), I wouldn't be surprised at all if the XP clock and boost speeds out the box have more to do with being thermally limited than anything else.

My bet is on a watercooled XP reaching similar O/C numbers to a 1080 with the fan set at 100% while the air cooled variant of the XP being 200-300 Mhz lower.
post #2658 of 3587
Quote:
Originally Posted by DNMock View Post

Considering the stock cooling solution on the XP is probably the same as the 1080 and will be producing a lot more heat (Don't forget the extra memory modules and VRM's that need to be cooled), I wouldn't be surprised at all if the XP clock and boost speeds out the box have more to do with being thermally limited than anything else.

My bet is on a watercooled XP reaching similar O/C numbers to a 1080 with the fan set at 100% while the air cooled variant of the XP being 200-300 Mhz lower.

That would be a first though. I could hit with the 1500 Mhz with Titan X on its tinky cooler. All I had to was to have a well ventilated case.

This will be the first Titan to overclock so far less than a non-Titan on air (if what you say is correct), it would be very surprising indeed, especially it it was meant to happen to the most expensive Titan ever produced...
post #2659 of 3587
Quote:
Originally Posted by DNMock View Post

Considering the stock cooling solution on the XP is probably the same as the 1080 and will be producing a lot more heat (Don't forget the extra memory modules and VRM's that need to be cooled), I wouldn't be surprised at all if the XP clock and boost speeds out the box have more to do with being thermally limited than anything else.

My bet is on a watercooled XP reaching similar O/C numbers to a 1080 with the fan set at 100% while the air cooled variant of the XP being 200-300 Mhz lower.

Or Nvidia trying to keep within 250w TDP.
    
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post #2660 of 3587
Seriously nothing yet? This comes out tomorrow!

What kind of company releases a $1200 product with no advertisement, exclusive to their site, and no reviews on actual performance. You'd think NVIDIA would post some exclusive benchmarks across a few games or something. This smells so fishy.
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