Meet the GeForce GTX 680

All things considered the design of the GeForce GTX 680 is not a radical departure from the GTX 580, but at the same time it also has some distinct differences owing to the fact that its TDP is some 50W lower than GTX 580.

Like the past GTX x80 cards, the basic design of the GTX 680 is that of a blower. A radial fan at the rear of the card sucks in air and pushes it towards the front of the card. Notably, due to a combination of card length and the fan position, the “wedge” around the fan has been done away with. NVIDIA tells us that this shouldn’t significantly impact the cooling of the card, particularly since it has a lower TDP in the first place, but when used in SLI it will remove some of the breathing room than the GTX 580 enjoyed.

Looking at the fan itself, compared to the GTX 580 the fan has been moved from the center of the card to the top of the card. This is due to NVIDIA’s port configuration, which uses a stacked DVI connector that consumes what would have normally been part of the exhaust vent on the GTX 580. We’ll get into the port configuration more in a minute, but for the moment the significance is that because the GTX 680 only has half a vent NVIDIA has moved the fan to match the vent, which is why the fan has been moved up.

On that note, the repositioning of the fan also had its own ramifications. Because the fan is now so close to the top and at the same time so close to the rear, NVIDIA went with a unique method of arranging the PCIe power sockets. Rather than having them side-by-side as we’ve seen on countless NVIDIA cards in the past, the sockets are stacked on each other in a staggered configuration. With the fan otherwise occupying the space that one of the sockets would take up, this configuration allowed NVIDIA to have two sockets without lengthening the card just to fit another socket. Overall this staggered design is not too difficult to work with, though with one socket facing the opposite way it might require some cable repositioning if you have a well maintained cable run.

Moving on, when we remove the shroud on the GTX 680 we see the fan, baseplate, and heatsink in full detail. NVIDIA is using an aluminum fin stacked heatsink, very similar to what we saw on the GTX 580. Underneath the heatsink NVIDIA is using a set of three heatpipes to transfer heat between the GPU and the heatsink. This is as opposed to the vapor chamber on the GTX 580, and while this setup doesn’t allow empirical testing, given the high efficiency of vapor chambers it’s likely that this isn’t quite as efficient, though to what degree we couldn’t say.

Finally, after removing the fan, baseplate, and heatsink, we can see the PCB in full detail. Unlike GF110 and GF114, GK104 is not capped with an IHS, allowing for the heatsink to directly come in contact with the GPU die. Meanwhile arranged around the GPU we can see the 8 2Gb GDDR5 RAM modules that give the GTX 680 its 2GB of RAM. These are Hynix R0C modules, which means they’re rated for 6GHz, the stock memory speed for the GTX 680. Overall the card measures 10” long with no overhang from the shroud, making it 0.5” shorter than the GTX 580.  

Looking at the top of the card, as always we see the SLI connectors. Following in the footsteps of the GTX 580, the GTX 680 features 2 SLI connectors, allowing for up to 3-way SLI.

Meanwhile at the front of the card we see the I/O bracket. As we alluded to previously, the GTX 680 uses a stacked DVI design here; NVIDIA has done everything they can to keep the DVI ports at the very bottom of the card to avoid impeding airflow, but the upper DVI port still occupies roughly 40% of what would otherwise be the vent. Altogether the GTX 680 features 2 DL-DVI ports, a full size HDMI port, and a full size DisplayPort.

While NVIDIA has used DVI and HDMI ports for quite some time, this is the first time NVIDIA has included DIsplayPort on a reference design. Unfortunately we find that this ruffles our feathers a bit, although this isn’t strictly NVIDIA’s fault. As we’ve covered in the past, DisplayPort comes in both a full size and miniDP configuration – AMD in particular has used miniDP since the Radeon HD 6800 series in 2010. And while we’re happy to see DisplayPort finally make it into an NVIDIA reference design, the fact that it’s a full size DisplayPort is less than encouraging because at this point in time DisplayPort has largely been replaced by miniDP.

Ultimately the fault for this lies more with the VESA than NVIDIA, but it’s indicative of a larger problem in the DisplayPort community in that both full size DP and miniDP are equally valid and equally capable ports. While full size DisplayPort has the distinction of coming first, thanks in large part to Apple it has largely been displaced by miniDP as the most common variant on source devices. The problem with this is that both miniDP and DisplayPort are now in wide use; wide, redundant use.

At this point desktop computers and video cards coming with full size DisplayPorts is silly at best, and frustrating at worst. The laptop guys aren’t going to give up miniDP due to the space savings, and there’s no significantly good reason to use DisplayPort on desktops when miniDP offers the same functionality. We would rather see the PC industry standardize on miniDP across all source devices, and thereby eliminate any ambiguity with regards to what cables or adaptors are necessary. DisplayPort adoption has been slow enough – having 2 variants of the port on source devices only makes it more confusing for everyone.

Finally, while we’re on the subject of display connectivity we quickly took a look at how the idle clockspeeds of GTX 680 are impacted by the use of multiple displays. With 2 displays GTX 680 can utilize its full idle clocks, but only if both displays are connected via a TMDS type connection (DVI/HDMI) and run with identical timings. But if different timings are used or if one display is connected via DisplayPort, then the GTX 680 will shift to its low power 3D clocks. However if we expand that to 3 monitors and enable NVIDIA Surround, then the GTX 680 can operate at full idle regardless of whether DisplayPort is used or not.

GPU Boost: Turbo For GPUs The Test
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  • SlyNine - Thursday, March 22, 2012 - link

    While I love BF3, it's not the only game that matters, but it is the only example of the 680 beating the 7970 at frame rates that matter. However the 7970 is catching up as the res goes up. If we add 2 monitors does the 680 still win ?

    BTW Crysis and Metro 2033 FPS matters to me. Do you think the GPU world revolves around you and what you want? You are not the center of the Videocard world.
    Reply
  • Eugene86 - Thursday, March 22, 2012 - link

    No, the GPU world doesn't revolve around me but as I already said, nobody but you and a handful of other people actually care about the Crysis and Metro benchmarks because almost nobody plays those games anymore.
    In my example, Battlefield 3 is a current game that is actually played by people so those benchmarks are useful.
    The only reason why Crysis and Metro are used are because they are benchmark games that stress the video cards to their limits. This is nice for bragging rights but completely useless in the real world.
    Nvidia and AMD both release video cards that are aimed to please their main market, which is gamers who play on a single monitor at 1080p.
    Reply
  • SlyNine - Friday, March 23, 2012 - link

    So what are you baseing this on? can you give me any sources?

    I'm not buying a 600$ video card for just one game.

    Plus like I said, as the settings go up, they seem to converge. I can't help but wonder if the 7970 would overtake the 680 at some point before we hit 30fps.
    Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    Then look at SHOGUN 2 total war in this very article man.
    Wow, s many of you are so controlled and so mindless on things...
    " Total War: Shogun 2 is the latest installment of the long-running Total War series of turn based strategy games, and alongside Civilization V is notable for just how many units it can put on a screen at once. As it also turns out, it’s the single most punishing game in our benchmark suite "
    680 takes the top in that game man.
    Reply
  • Galidou - Sunday, March 25, 2012 - link

    ''Nvidia and AMD both release video cards that are aimed to please their main market, which is gamers who play on a single monitor at 1080p''

    Well then it means that gamers can be more than pleased with a radeon 6870 at 140$ that runs everything with 95% graphical options enabled or a gtx 560ti(not the 448 cores version) for around 200$ which performs a little better than the 6870 and still does the trick in everygame at 1080p.

    Prices taken from the bay as no regular 560ti was available on newegg for price comparison.

    Oh... and for the 5% graphical options you can't turn on, you'll only notice when you go on a sunday walk in your games, but doing so will have you dead in a second if you play online against other players...
    Reply
  • b3nzint - Monday, March 26, 2012 - link

    i play metro, cysis a lot, amazing graphic! but thats not "real world" to me. maybe if i play bf3 im in real world? Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    Shogun 2 total war, the most demanding game in the benches- did you read ?
    Nvidia GTX680 sweeps the entire resolution set beating the slower 7970 that cannot handle modern demanding games as well,.
    Reply
  • akse - Thursday, March 22, 2012 - link

    Seems impossible to do such a feat!!! Considering they launched it months later than the competitor! Reply
  • arjuna1 - Thursday, March 22, 2012 - link

    Correct??

    You call +10 fps difference at best, on certain situations, a domination??

    The only good thing this will bring is prices down, the rest is truly unremarkable, for both companies.

    See you in the 8xxx/7xxx series.
    Reply
  • Wreckage - Thursday, March 22, 2012 - link

    Maybe I was a bit hasty. I did forget to mention that it hard launched with working drivers and working h.264 encoding, also quiet under load. Impressive++ Reply

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