Power, Temperature, & Noise

Wrapping up our look at the stock performance characteristics of the GTX 680 Classified, we have what’s perhaps our most important results section: power, temperature, & noise.

When it comes to custom cards these results can often make or break a card, depending on the niche it’s going for. The GTX 680 Classified is a high performing card, but it’s not a card shooting for performance at any cost, so we expect to find some kind of reasonable balance here.

GeForce GTX 600 Series Voltages
EVGA GTX 680C Boost Load Ref GTX 680 Boost Load EVGA GTX 680C Idle
1.175v 1.175v 0.987v

Note that at its stock settings EVGA must follow NVIDIA’s defaults, so the GTX 680 Classified has the same 1.175v load voltage as the reference GTX 680. This is where binning comes into play, as EVGA needs to identify GK104 GPUs that can reach 1100MHz+ at 1.175v in order to make the GTX 680 Classified a viable product.

EVGA GTX 680 Classified Average Clockspeed
Game Clockspeed
Crysis: Warhead 1188MHz
Metro 2033 1211MHz
DiRT 3 1211MHz
Shogun2 1162MHz
Batman: Arkham City 1188MHz
Portal 2 1211MHz
Battlefield 3 1188MHz
Starcraft II 1188MHz
Skyrim 1211MHz
Civilization V 1188MHz

Meanwhile, looking at the GTX 680 Classified’s median clockspeed during our benchmarks, we can see that our earlier speculation about the impact of such a high power target was true. The maximum boost bin on our card is 1201MHz (versus 1110MHz for our reference card), and with the exception of Shogun 2, the GTX 680 Classified is almost constantly at 1201MHz or the temperature-induced 1188MHz during our tests. With Shogun 2 that drops down to 1162MHz. With such a high power target the resulting clockspeeds are very consistent for a GTX 680 card.

Moving on to power consumption, there are no great surprises here for the GTX 680 Classified when it comes to idle power consumption. With the additional VRM phases and more importantly 8 extra GDDR5 memory chips, idle power consumption has to go up. The impact is that idle power consumption rises by 8-9W, which would push the total idle power consumption of the card up to around 25W. Note however that this is still better than the GTX 580.

Load power on the other hand looks very good. In fact it’s much better than we were expecting. Despite the additional memory chips and the factory overclock, under Metro power consumption only rises 10W at the wall. This is still less than the7970, let alone the 7970GE.

The story with OCCT is much the same. Here we can see that power at the wall increases by all of 12W, which is roughly the remaining difference between the GTX 680 Classified and the 7970. Ultimately the binning process necessary for EVGA to assign GK104 GPUs to their various products has pushed the very best GK104 GPUs into the Classified. The end result is that even at NVIDIA’s standard voltage of 1.175v, the GK104 GPU in our card ends up consuming less power than a more typical GK104 GPU, which allows the GTX 680 Classified to partially offset the higher power consumption of the additional RAM, additional VRM phases, and the factory overclock.

The final result is that the GTX 680 Classified still consumes a bit more power than the reference GTX 680, but not immensely so. Furthermore depending on whether we’re looking at Metro or OCCT, the GTX 680 Classified still draws 30-50W less than the next-nearest competitor, the 7970GE.

Moving on to temperatures, since EVGA has equipped the GTX 680 Classified with what’s functionally a larger version of the GTX 680’s blower, there are no grand surprises here. The GTX 680 Classified idles at 33C, which so far appears to be typical for these latest iterations of high-performance video cards.

Load GPU temperatures on the other hand are clearly benefitting not only from the larger cooler of the GTX 680 Classified, but also its lower GPU power consumption. With both OCCT and Metro the GTX 680 Classified is 6C cooler than the reference GTX 680. Blowers aren’t known as the most effective coolers, so to reach the low 70s like this is definitely impressive.

Last but not least we have our look at noise levels. Starting with idle noise, the GTX 680 Classified makes no significant tradeoff for its size. Idle noise ends up being a hair higher than the reference GTX 680, but not noticeably so.

With load noise levels on the other hand we find ourselves once again impressed. The larger cooler and larger fan means that the GTX 680 Classified generates less noise than even the reference GTX 680, which was already a fairly quiet card for its performance level. We had expected EVGA to make some kind of temperature/noise tradeoff here but there’s none to be found. They have managed to lower both at the same time.

Ultimately it’s clear that while EVGA has engineered the GTX 680 Classified for heavy overclocking, they haven’t sacrificed reference performance to get there. When it comes to both temperatures and noise, the GTX 680 Classified is suitably superior to the reference GTX 680. The fact that EVGA did all of this with a blower makes it all the more impressive, since we typically only see gains like these by switching to an open air cooler. Granted these improvements are largely a consequence of the need to overbuild the card for the kind of heavy overclocking it was designed for, but if you do run at stock there are definitely benefits to be realized.

Portal 2, Battlefield 3, Starcraft II, Skyrim, Civilization V, & Compute Overclocked: Power, Temperature, & Noise
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  • Oxford Guy - Wednesday, July 25, 2012 - link

    "The 680 is cooler and quieter and higher performing all at the same time than anything we've seen in a long time..."

    Gee whiz. I wonder why 28nm is more efficient than 40nm.
  • jmsabatini - Tuesday, July 24, 2012 - link

    You really needed to test Skyrim with a TON of ultra high res texture mods.

    Without that, your results were right in line with my expectations, i.e. not worth the extra $$$ over the vanilla card.
  • CeriseCogburn - Wednesday, July 25, 2012 - link

    Something the regular joe moronic masses cannot seem to comprehend for the life of them, is when the cores peter out before the ram can be effectively used while maintaining a playable framerate, no amount of memory no matter how much "can help".

    Let me put it another way:

    The card makers need a more powerful core to use more than 2GB memory.(actually less than 2, but I won't go into that)

    The results are all over the web, and have been for months. No one should still be so utterly blind to the disclosed facts, still.

  • hammbone852 - Saturday, September 15, 2012 - link

    This is disappointing but i'm guessing the drivers aren't pushing the GPU to Its fill potential. This card should be in the top 3 in all tests.
  • Pey - Friday, September 21, 2012 - link

    As a SLI user, I will buy two of these and I´ll tell you why.

    I tried 2 MSI 680 Lightning are the temps go up to 75-76 each card, while 2 680 reference cards reach 72°. So you guys forget that for sli users, you have to get cards with a blower -unless you have watercooling.
    I know the price is not ideal, but for people like who are looking for a couple 680 with overclock and a proper watercooler-free solution, this is the card to go.
    You could go for a MSI Lightning, but when you put in another card, temps will go up to 15-20° on each card, and i dont like playing while having 76-78° plus the noise.

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