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 - Friday, March 23, 2012 - link

    lol, you're way of the mark.

    My point wasn't that the 680GTX isn't faster, it's however that it does stand up well against the 680GTX in performance.

    As far as compute goes, I'm not sure I understand your premise. Frankly I think it's an invalid inference. I said kills it. If that somehow implies it means it losses in the other compute tests, I'm not sure how you got there. Again invalid inference of the data.
    Reply
  • Galidou - Friday, March 23, 2012 - link

    You didn't get the point of what he meant. Yes AMD is loosing but mostly in games that already run 60+fps. The games AMD wins is where it's still not maxed out yet(below 60 fps).

    Which maybe means if some big demanding games come out, the winning/loosing shceme might go back and forth. But right now, not much games out there will push those gpus unless you got very high resolutions and right now, I think 90% of gamers have 1080p and lower which still runs super smooth with 95% of graphical options enables on a 150$ GPU...

    Still gotta say that this GTX 680 is really good for a flagship and the first one that's not uber huge and noisy and hot...
    Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    Shogun 2 TOTAL WAR, in this bench set is THE HARDEST GAME, not metro2033 and not crysis warhead.
    Sorry feller but ignoring that gets you guys the big fib you want.
    Sorry.
    Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    SHOGUN 2 680 wins in top rez.
    from article " 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"

    OH WELL guess it's the metro2033 and crysis game engines cause the hardest game Nvidia 680 wins.
    Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    No you're WRONG. 1. 608 wins 1 bench in Merto2033, and ties within bench error on the other two resolutions.
    The hardest game as stated by the reviewer (since you never read) is Shogun2 total war, and Nvidia makes a clean sweep at all resolutions there.
    In fact the Nvidia card wins everything but Crysis here, ties on Metro, and smokes everything else.
    If Metro isn't a tie, take a look at the tie Ryan has for Civ5 and get back to me... !
    (hint: Nvidia wins by far more in Civ5)
    So--- let's see, one game with wierd benching old benching and AMD favored benchmark (dumping the waterfall bench that Nvidia won on all the time) >(Crysis)
    One "tie" metro2033, then Nvidsia sweeps the rest of them. many by gigantic frame rate victories.
    Other places show Nvidia winning metro2003 by a lot. (pureoverclock for one)
    ....
    No I'm not the one fudging, spinning and worse. You guys are. You lost, lost bad, man up.
    Reply
  • b3nzint - Monday, March 26, 2012 - link

    gt680 got more clocks, way higher memory bandwidth than 7970 thats why it got lower power load and price. but i think we can only compare 2 things if they have the "same" engine like drag race cars. both of them made a big leap from previous tech. and thats a win for us.
    btw, who comes out first ..amd. i say amd win period. so next time maybe they must release next gen gpu on the same time.
    Reply
  • b3nzint - Monday, March 26, 2012 - link

    sorry what i meant was gtx 680 has lower memory, so it gain lower power. Reply
  • CeriseCogburn - Tuesday, March 27, 2012 - link

    Or so a memory overclock unleashes it and it screams even further away at the tops of the charts... Reply
  • dlitem - Thursday, March 22, 2012 - link

    Actual street prices can be different:

    At least here on the eastern shores of Atlantic ocean German retailers are selling 7970's starting 460-470 eur including taxes with cards on stock and GTX680's are starting 499eur with taxes...
    Reply
  • TheRealArdrid - Thursday, March 22, 2012 - link

    Sigh, are people really relying on that weak argument again? It's the same thing people said when Intel starting trouncing AMD: it's not fair because Intel has Turbo Boost. Reply

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