7970 Overclocking with voltage control :o)

[Tempered81]

Shamino got a 7970. Raised the voltage to 1.17 volts to the core, was able to reach 1650mhz. Subzero cooling though.

Source:
http://kingpincooling.com/forum/showthread.php?t=1559

 

[lavaheadache]

holy crap...

 

[ArchAngel777]

Way cool, but I'd rather have seen how far he could have clocked it with the reference heatsink and fan combo. Be interesting to know if the 1125 clock limit that many received is truly an artificial limit, or if it has more head room.

These super cooling sessions are fun, but offer little real world value to those who might be purchasing one of these cards.

I can't wait to see if these things really can hit 1200 out the box, or if the review cards that hit 1125 were cherry picked.

 

[INGlewood78]

wowsers...

 

[Awkward]

insane

 

[Arkadrel]

Holy mother of.....


925mhz ---> 1650 mhz (~79% overclock).

1800mhz memory clocks..


How much does it beat a 590 or 6990 by at those speeds?
Around 50% faster than a 6990 or so?

1.17 vcore... doesnt sound so bad.

 

[Spikesoldier]

WOW.

but yeah, lets see it on air.

i would be interested in results both on stock HS/F, and something monstrous such as thermalright shaman.

and what is stock vcore? how much did they have to overvolt to get that high?

 

[Arkadrel]

Apperently the guy overclocking it, says hes CPU bottlenecked,
and it should be able to do around a 16k+ score on its own, if it had a faster cpu.

craaaazy..... 7970 is a nice overclocker.

actually 1800 ram is easy, i ran 2000 ram and it got the ECC correction and the score was worse.

 

[Granseth]

Way cool, but I'd rather have seen how far he could have clocked it with the reference heatsink and fan combo. Be interesting to know if the 1125 clock limit that many received is truly an artificial limit, or if it has more head room.

These super cooling sessions are fun, but offer little real world value to those who might be purchasing one of these cards.

I can't wait to see if these things really can hit 1200 out the box, or if the review cards that hit 1125 were cherry picked.

http://www.legitreviews.com/article/1805/14/
these guys got a good sample and some tool to do overclocking beyond AMD's limitations. 1165 clock and 1625 on the memory.

So no 1200 but still a great clock. And I would be surprised if most cards is able to hit 1125. But it seems like it will be a great overclocker, but will have to wait and see once people are starting to get their hands on these cards.

 

[Arkadrel]

@Granseth

Legitreview's only got a bios modded with higher limits, to allow them to go higher than CCC does.
However they still capped it out, and that was at stock voltage.

The 7970 *can* go higher than 1125mhz core, 1625mhz memory on Air, once you start giveing it more voltage.

 

[tweakboy]

Holy Moly, thats over 500Mhz of OC on the core. I wonder how the VRAM OCes on these. ,,

 

[Corporate Thug]

very sweet but meaningless to the average buyer. I think the non-reference designs are going to play a big role in the 7970s and people will be willing to spend the premium on aftermarket coolers.

 

[biostud]

Holy Moly, thats over 500Mhz of OC on the core. I wonder how the VRAM OCes on these. ,,

if you read the above posts...

 

[Arkadrel]

I think the non-reference designs are going to play a big role in the 7970s and people will be willing to spend the premium on aftermarket coolers.

totally agree with above:

This card has so much potential, AIB are gonna love putting out factory overclocked versions
of it, with improved cooling solutions.

Holy Moly, thats over 500Mhz of OC on the core. I wonder how the VRAM OCes on these. ,,

Its a (1650-925) = 725mhz overclock on the core (~79% overclock).

and

(1800-1375) = 425 mhz overclock on the memory (~31% overclock).

 

[OVerLoRDI]

Amazing, but I want to see the oc headroom on the air cooler or water cooling with voltage control.

But still.. wow 1.6ghz gpu..

 

[RaistlinZ]

I can only imagine how expensive aftermarket version of the 7970 will be. I think the only time to get one at MSRP is going to be launch day.

 

[Elfear]

Getting excited now. 1.2-1.3Ghz shouldn't be too hard on water if the retail cards clock anything like Shamino's does.

 

[Joseph F]

HOLYF**KINSH*TBBQ!
I want to see some BF3 25x16 benchmarks.

BTW, that's 345.6 GB/s memory bandwidth and 6758.7 GFLOPS.

 

[Quantos]

Gasp!

Nice overclock indeed! It does leave questions to be answered, but definitely does make me optimistic. If the card can reach such high clocks with extreme cooling, hopefully it'll reach something in between with voltage tweaking and custom coolers! To me, the big question that remains is that we don't know if these are just premium samples, or if all cards will be similar to this. However, considering such a high overclock potential, even if this is a very good, cherry picked sample, a normal quality GPU would still have a lot of overclocking headroom.

 

[Madcatatlas]

The only thing of interest to me, is stable OC on air.

 

[flopper]

expected oc.
should be able to break 1700 and even 1800mhz on a good sample.

 

[MrK6]

Stock voltage is 1.1V, correct? So a meager 6.3% increase in voltage gives way for a 79% overclocking . What I take away from this is that these cards love cold. I'm excited to see what they're capable of on water :awe:. Great find OP.

 

[Lonyo]

Stock voltage is 1.1V, correct? So a meager 6.3% increase in voltage gives way for a 79% overclocking . What I take away from this is that these cards love cold. I'm excited to see what they're capable of on water :awe:. Great find OP.

It will be interesting to see if anyone comes out with an HD7970 prefitted with a water block (various manufacturers did for the GTX580).

 

[-Slacker-]

Stock voltage is 1.1V, correct? So a meager 6.3% increase in voltage gives way for a 79% overclocking . What I take away from this is that these cards love cold. I'm excited to see what they're capable of on water :awe:. Great find OP.

A meager 6.3% and a tube full of LN2...

 

[james1701]

There is so much room in this card, I can't believe they are not holding something back for a new revision once team green launches their cards. Something like when the 4890 came. I am hesitant to buy one at launch.