Meet The GeForce GTX 780 Ti

When it comes to the physical design and functionality of the GTX 780 Ti, to no surprise NVIDIA is sticking with what works. The design of the GTX Titan and its associated cooler have proven themselves twice over now between the GTX Titan and the GTX 780, so with only the slightest of changes this is what NVIDIA is going with for GTX 780 Ti, too. Consequently there’s very little new material to cover here, but we’ll quickly hit the high points before recapping the general design of what has now become the GTX 780 series.

The biggest change here is that GTX 780 Ti is the first NVIDIA launch product to feature the new B1 revision of their GK110 GPU. B1 has already been shipping for a couple of months now, so GTX 780 Ti isn’t the first card to get this new GPU. However while GTX Titan and GTX 780 products currently contain a mix of the old and new revisions as NVIDIA completes the change-over, GTX 780 Ti will be B1 (and only B1) right out the door.

As for what’s new for B1, NVIDIA is telling us that it’s a fairly tame revision of GK110. NVIDIA hasn’t made any significant changes to the GPU, rather they’ve merely gone in and fixed some errata that were in the earlier revision of GK110, and in the meantime tightened up the design and leakage just a bit to nudge power usage down, the latter of which is helpful for countering the greater power draw from lighting up the 15th and final SMX. Otherwise B1 doesn’t have any feature changes nor significant changes in its power characteristics relative to the previous revision, so it should be a fairly small footnote compared to GTX 780.

The other notable change coming with GTX 780 Ti is that NVIDIA has slightly adjusted the default temperature throttle point, increasing it from 80C to 83C. The difference in cooling efficiency itself will be trivial, but since NVIDIA is using the exact same fan curve on the GTX 780 Ti as they did the GTX 780, the higher temperature throttle effectively increases the card’s equilibrium point, and therefore the average fan speed under load. Or put another way, but letting it get a bit warmer the GTX 780 Ti will ramp up its fan a bit more and throttle a bit less, which should help offset the card’s increased power consumption while also keeping thermal throttling minimized.

GeForce GTX 780 Series Temperature Targets
GTX 780 Ti Temp Target GTX 780 Temp Target GTX Titan Temp Target
83C 80C 80C

Moving on, since the design of the GTX 780 Ti is a near carbon copy of GTX 780, we’re essentially looking at GTX 780 with better specs and new trimmings. NVIDIA’s very effective (and still quite unique) metallic GTX Titan cooler is back, this time featuring black lettering and a black tinted window. As such GTX 780 Ti remains a 10.5” long card composed of a cast aluminum housing, a nickel-tipped heatsink, an aluminum baseplate, and a vapor chamber providing heat transfer between the GPU and the heatsink. The end result is the GTX 780 Ti is a quiet card despite the fact that it’s a 250W blower design, while still maintaining the solid feel and eye-catching design that NVIDIA has opted for with this generation of cards.

Drilling down, the PCB is also a re-use from GTX 780. It’s the same GK110 GPU mounted on the same PCB with the same 6+2 phase power design. This being despite the fact that GTX 780 Ti features faster 7GHz memory, indicating that NVIDIA was able to hit their higher memory speed targets without making any obvious changes to the PCB or memory trace layouts. Meanwhile the reuse of the power delivery subsystem is a reflection of the fact that GTX 780 Ti has the same 250W TDP limit as GTX 780 and GTX Titan, though unlike those two cards GTX 780 Ti will have the least headroom to spare and will come the closest to hitting it, due to the general uptick in power requirements from having 15 active SMXes. Finally, using the same PCB also means that GTX 780 has the same 6pin + 8pin power requirement and the same display I/O configuration of 2x DL-DVI, 1x HDMI, 1x DisplayPort 1.2.

On a final note, for custom cards NVIDIA won’t be allowing custom cards right off the bat – everything today will be a reference card – but with NVIDIA’s partners having already put together their custom GK110 designs for GTX 780, custom designs for GTX 780 Ti will come very quickly. Consequently, expect most (if not all of them) to be variants of their existing custom GTX 780 designs.

The NVIDIA GeForce GTX 780 Ti Review Hands On With NVIDIA's Shadowplay & The Test
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  • fewafwwaefwa - Thursday, November 07, 2013 - link

    sterven. Reply
  • looncraz - Thursday, November 07, 2013 - link

    When game producers author the games they will do it with a mind towards Mantle and exploiting the AMD GPU characteristics exposed by Mantle on PCs for their console games.

    When creating portable software you create as thin of an abstraction layer as possible, that layer will now be much closer to the metal with unoptimized DirectX alternatives being manually added. That could very well mean that AMD hardware will have a noticeable advantage on PCs and game producers will only need to do a little extra work to become compatible with other DX-10/11 compatible video cards on Windows/Linux - so nVidia will become something of a "don't forget about me!" rather than "let's build to a generic platform and pull in the nVidia GPU extensions..."
    Reply
  • Basstrip - Friday, November 08, 2013 - link

    I think they've ALWAYS programmed directly to the core. I think it's safe to assume that the processes translate fairly well and that although they might not be the same, they are similar.

    It just seems so economic to streamline the whole process. Less of a headache than to constantly try optimize things for multiple platforms.

    AMD chips on consoles may not be able to support mantle on the hardware side but programming for consoles and for pc will definitely NOT be 2 completely different things.
    Reply
  • elajt_1 - Friday, November 08, 2013 - link

    Something I read on Extremetech: Feedback we’ve gotten from other sources continues to suggest that Microsoft’s low-level API for the Xbox One is extremely similar to Mantle, and the difference between the two is basically semantic. This doesn’t square very well with Microsoft’s own statements; we’ll continue to investigate.
    http://www.extremetech.com/gaming/168671-xbox-one-...
    Reply
  • klmccaughey - Monday, November 11, 2013 - link

    The difference is a couple of header files. Izzy Wizzy! And you have your API calling code in Xbox transferable to a PC, the header files compile the API's to Mantle API - but both API's are essentailly the same. It couldn't be easier. Reply
  • polaco - Friday, November 08, 2013 - link

    The point of mantle I think is to provide an easy way to port from PC to console or Console to PC. So giving the possibility to allow an easier cross compilation. Reply
  • L33T BEANS - Friday, November 08, 2013 - link

    Basing someones intelligence on a single statement is unwise. Reply
  • Totally - Sunday, November 10, 2013 - link

    Reading these comments makes me wonder, if these people slinging mantle around like a buzzword actually know what it does, because going by the comments alone trying to pitting it against g-sync they clearly don't. Mantle is as relevant to gamers as Cuda is. Yes it does have a direct impact but the benefits aren't for the end user. Reply
  • klmccaughey - Monday, November 11, 2013 - link

    You do not understand. The API on the consoles is basically "Mantle". Mantle copies verbatim the API calls for the consoles. They just call it the API on the console. Port the code across, change a few headers, and you have your Mantle calls ;) Reply
  • MonkeyM - Sunday, November 10, 2013 - link

    They will sell DIY kits, you don't need a new monitor, as per the press conference. Reply

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