NVIDIA GeForce GTX 780 Review: The New High End
by Ryan Smith on May 23, 2013 9:00 AM ESTMeet The GeForce GTX 780, Cont
With all of that said, GTX 780 does make one notable deviation from GTX Titan. NVIDIA has changed their stock fan programming for GTX 780, essentially slowing down the fan response time to even out fluctuations in fan speeds. NVIDIA has told us that they’ve found that next to loud fans in general, the second most important factor in fan noise becoming noticeable is rapidly changing fan speeds, with the changing pitch and volume drawing attention to the card. Slowing down the response time in turn will in theory keep the fan speed from spiking so much, or quickly dropping (i.e. loading screen) only to have to immediately jump back up again.
In our experience fan response times haven’t been an issue with Titan or past NVIDIA cards, and we’d be hard pressed to tell the difference between GTX 780 and Titan. With that said there’s nothing to lose from this change, GTX 780 doesn’t seem to be in any way worse for it, so in our eyes there’s no reason for NVIDIA not to go ahead with the change.
On that note, since this is purely a software(BIOS) change, we asked NVIDIA about whether this could be backported to the hardware equivalent Titan. The answer is fundamentally yes, but because NVIDIA doesn’t have a backup BIOS system, they aren’t keen on using BIOS flashing any more than necessary. So an official (or even unofficial) update from NVIDIA is unlikely, but given the user community’s adept BIOS modding skills it’s always possible a 3rd party could accomplish this on their own.
Moving on, unlike Titan and GTX 690, NVIDIA will be allowing partners to customize GTX 780, making this the first line of GK110 cards to allow customization. Potential buyers that were for whatever reason disinterested in Titan due to its blower will find that NVIDIA’s partners are already putting together more traditional open air cooler coolers for GTX 780. We can’t share any data about them yet – today is all about the reference card – but we already have one such card in-hand with EVGA’s GeForce GTX 780 ACX.
The reference GTX 780 sets a very high bar in terms of build quality and performance, so it will be interesting to see what NVIDIA’s partners can come up with. With NVIDIA testing and approving all designs under their Greenlight program, all custom cards have to meet or beat NVIDIA’s reference card in factors such as noise and power delivery, which for GTX 780 will not be an easy feat. However because of this requirement it means NVIDIA’s partners can deviate from NVIDIA’s reference design without buyers needing to be concerned that custom cards are significantly worse than then reference cards, something that benefits NVIDIA’s partners by their being able to attest to the quality of their products (“it got through Greenlight”), and benefitting buyers by letting them know they’re getting something that will be as good as the reference GTX 780, regardless of the specific make or model.
On that note, since we’re talking about card construction let’s quickly dive into overclocking. Overclocking is essentially unchanged from GTX Titan, especially since everything so far is using the reference PCB. The maximum power target remains at 106% (265W) and the maximum temperature target remains at 95C. Buyers will be able to adjust these as they please through Precision X and other tools, but no more than they already could on Titan, which means overclocking is fairly locked down.
Overvolting is also supported in a Titan-like manner, and once again is at the discretion of the card’s partner. By default GTX 780 has a maximum voltage of 1.1625v, with approved overvolting allowing the card to be pushed to 1.2v. This comes in the form of higher boost bins, so enabling overvolting is equivalent to unlocking a +13MHz bin and a +26MHz bin and their requisite voltages. However this also means that those voltages aren’t typically reached with overclocking and overvolting only has a minimal effect, as most overclocking attempts are going to hit TDP limits before they hit the unlocked boost bins.
| GeForce Clockspeed Bins | ||||
| Clockspeed | GTX Titan | GTX 780 | ||
| 1032MHz | N/A | 1.2v | ||
| 1019MHz | 1.2v | 1.175v | ||
| 1006MHz | 1.175v | 1.1625v | ||
| 992MHz | 1.1625v | 1.15v | ||
| 979MHz | 1.15v | 1.137v | ||
| 966MHz | 1.137v | 1.125v | ||
| 953MHz | 1.125v | 1.112v | ||
| 940MHz | 1.112v | 1.1v | ||
| 927MHz | 1.1v | 1.087v | ||
| 914MHz | 1.087v | 1.075v | ||
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milkman001 - Friday, May 24, 2013 - link
FYI,On the "Total War: Shogun 2" page, you have the 2650x1440 graph posted twice.
JDG1980 - Saturday, May 25, 2013 - link
I don't think that the release of this card itself is problematic for Titan owners - everyone knows that GPU vendors start at the top and work their way down with new silicon, so this shouldn't have come as much of a surprise.What I do find problematic is their refusal to push out BIOS-based fan controller improvements to Titan owners. *That* comes off as a slap in the face. Someone spends $1000 on a new video card, they deserve top-notch service and updates.
inighthawki - Saturday, May 25, 2013 - link
The typically swapchain format is something like R8G8B8A8 and the alpha channel is typically ignored (value of 0xFF typically written), since it is of no use to the OS, since it will not alpha blend with the rest of the GUI. You can create a 24-bit format, but it's very likely that for performance reasons, the driver will allocate it as if it were a 32-bit format, and not write to the upper 8 bits. The hardware is often only capable of writing to 32 bit aligned places, so its more beneficial for the hardware to just waste 8 bits of data and not have to do any fancy shifting to read or write from each pixel. I've actually seen cases where some drivers will allocate 8-bit formats as 32-bit formats, wasting 4x the space the user thought they were allocating.jeremyshaw - Saturday, May 25, 2013 - link
As a current GTX580 owner running at 2560x1440, I don't have any want of upgrade, especially in compute performance. I think I'll hold out for at least one more generation, before deciding.ahamling27 - Saturday, May 25, 2013 - link
As a GTX 560 Ti owner, I am chomping at the bit to pick up an upgrade. The Titan was out of the question, but the 780 looks a lot better at 65% of the cost for 90% of the performance. The only thing holding me back is that I'm still on z67 with a 2600k overclocked to 4.5 ghz. I don't see a need to rebuild my entire system as it's almost on par with the z77/3770. The problem is that I'm still on PCIe 2.0 and I'm worried that it would bottleneck a 780.Considering a 780 is aimed at us with 5xx or lower cards, it doesn't make sense if we have to abandon our platform just to upgrade our graphics card. So could you maybe test a 780 on PCIe 2.0 vs 3.0 and let us know if it's going to bottleneck on 2.0?
Ogdin - Sunday, May 26, 2013 - link
There will be no bottleneck.mapesdhs - Sunday, May 26, 2013 - link
Ogdin is right, it shouldn't be a bottleneck. And with a decent air cooler, you ought to be
able to get your 2600K to 5.0, so you have some headroom there aswell.
Lastly, you say you have a GTX 560 Ti. Are you aware that adding a 2nd card will give
performance akin to a GTX 670? And two 560 Tis oc'd is better than a stock 680 (VRAM
capacity not withstanding, ie. I'm assuming you have a 1GB card). Here's my 560Ti SLI
at stock:
http://www.3dmark.com/3dm11/6035982
and oc'd:
http://www.3dmark.com/3dm11/6037434
So, if you don't want the expense of an all new card for a while at the cost level of a 780,
but do want some extra performance in the meantime, then just get a 2nd 560Ti (good
prices on eBay these days), it will run very nicely indeed. My two Tis were only 177 UKP
total - less than half the cost of a 680, though atm I just run them at stock speed, don't
need the extra from an oc. The only caveat is VRAM, but that shouldn't be too much of
an issue unless you're running at 2560x1440, etc.
Ian.
ahamling27 - Wednesday, May 29, 2013 - link
Thanks for the reply! I thought about SLI but ultimately the 1 GB of vram is really going to hurt going forward. I'm not going to grab a 780 right away, because I want to see what custom models come out in the next few weeks. Although, EVGA's ACX cooler looks nice, I just want to see some performance numbers before I bite the bullet.Thanks again!
inighthawki - Tuesday, May 28, 2013 - link
Your comment is inaccurate. Just because a game requires "only 512MB" of video ram doesn't mean that's all it'll use. Video memory can be streamed in on the fly as needed off the hard drive, and as a result you can easily use a lot if you wanted as a performance optimization. I would not be the least bit surprised to see games on next gen consoles using WAY more video memory than regular memory. Running a game that "requires" 512MB of VRAM on a GPU with 4GB of VRAM gives it 3.5GB more storage to cache higher resolution textures.AmericanZ28 - Tuesday, May 28, 2013 - link
NVIDIA=FAIL....AGAIN! 780 Performs on par with a 7970GE, yet the GE costs $100 LESS than the 680, and $250 LESS than the 780.