IMPORTANT UPDATE: After writing this story, but before publication, we went to NVIDIA for comment. As we were getting ready to publish, the company updated me with a shift in its stance on multi-GPU configurations. NVIDIA will no longer require an "enthusiast key" to enable SLI on more than two GPUs. However, NVIDIA will also only be enabling 3-Way and 4-Way SLI for a select few applications. More details are at the bottom of the story!
You'll likely recall that during our initial review of the GeForce GTX 1080 Founders Edition graphics card, we mentioned that NVIDIA was going to be moving people towards the idea that "only 2-Way SLI will be supported" and promoted. There would still be a path for users that wanted 3 and 4 GPU configurations anyway, and it would be called the Enthusiast Key.
As it turns out, after returning from an AMD event focused on its upcoming Polaris GPUs, I happen to have amassed a total of four GeForce GTX 1080 cards.
Courtesy of some friends at EVGA and two readers that were awesome enough to let me open up their brand new hardware for a day or so, I was able to go through the 3-Way and 4-Way SLI configuration process. Once all four were installed, and I must point out how great it is that each card only required a single 8-pin power connector, I installed the latest NVIDIA driver I had on hand, 368.19.
Knowing about the need for the Enthusiast Key, and also knowing that I did not yet have one and that the website that was supposed to be live to enable me to get one is still not live, I thought I might have stumbled upon some magic. The driver appeared to let me enable SLI anyway.
Enthusiasts will note however that the green marker under the four GPUs with the "SLI" text is clearly only pointing at two of the GTX 1080s, leaving the remaining two…unused. Crap.
At this point, if you have purchased more than two GeForce GTX 1080 cards are simply out of luck and are waiting on NVIDIA to make good on it's promise to allow for 3-Way and 4-Way configurations via the Enthusiast Key. Or some other way. It's way too late now to simply say "we aren't supporting it at all."
While I wait…what is there for a gamer with four GeForce GTX 1080 cards to do? Well, you could run Ashes of the Singularity. It's multi-GPU mode uses MDA mode, which means the game engine itself accesses each GPU on its own, without the need for the driver to handle anything regarding GPU load balancing. Unfortunately, Ashes only supports two GPUs today.
Well…you could run an OpenCL based benchmark like LuxMark that access all the GPUs independently as well.
I did so, and the result is an impressive score of 17,127!!
How does that compare to some other products?
The four GTX 1080 cards produce a score that is 2.57x the result provided by the AMD Radeon Pro Duo and 2.29x the score of SLI GeForce GTX 980 Ti cards. Nice!
So there you go! We are just as eager to get our hands on the ability to test 3-Way and 4-Way SLI with new Pascal GPUs as some of the most extreme and dedicated enthusiasts out there are. With any luck, NVIDIA will finally figure out a way to allow it – no matter how it finally takes place.
IMPORTANT UPDATE: Before going to press with this story I asked NVIDIA for comment directly: when was the community finally going to get the Enthusiast Key website to unlock 3-Way and 4-Way SLI for those people crazy enough to have purchased that many GTX 1080s? The answer was quite surprising: NVIDIA is backing away from the idea of an "Enthusiast Key" and will no longer require it for enabling 3-Way and 4-Way SLI.
Here is the official NVIDIA statement given to PC Perspective on the subject:
With the GeForce 10-series we’re investing heavily in 2-way SLI with our new High Bandwidth bridge (which doubles the SLI bandwidth for faster, smoother gaming at ultra-high resolutions and refresh rates) and NVIDIA Game Ready Driver SLI profiles. To ensure the best possible gaming experience on our GeForce 10-series GPUs, we’re focusing our efforts on 2-way SLI only and will continue to include 2-way SLI profiles in our Game Ready Drivers.
DX12 and NVIDIA VR Works SLI technology also allows developers to directly implement and control multi-GPU support within their games. If a developer chooses to use these technologies then their game will not need SLI profiles. Some developers may also decide to support more than 2 GPUs in their games. We continue to work with all developers creating games and VR applications that take advantage of 2 or more GPUs to make sure they’ll work great on GeForce 10-series GPUs.
For our overclocking community, our Game Ready Drivers will also include SLI profiles for 3- and 4-way configurations for specific OC applications only, including Fire Strike, Unigine and Catzilla.
NVIDIA clearly wants to reiterate that only 2-Way SLI will get the attention that we have come to expect from the GeForce driver dev team. As DX12 and Vulkan next-generation APIs become more prolific, the game developers will still have the ability to directly access more than two GeForce GTX 10-series GPUs, though I expect that be a very narrow window of games simply due to development costs and time.
NVIDIA will enable support for three and four card configurations in future drivers (without a key) for specific overclocking/benchmarking tools only, as a way to make sure the GeForce brand doesn't fall off the 3DMark charts. Only those specific applications will be able operate in the 3-Way and 4-Way SLI configurations that you have come to know. There are no profiles to change manually and even the rare games that might have "just worked" with three or four GPUs will not take advantage of more than two GTX 10-series cards. It's fair to say at this point that except for the benchmarking crowd, NVIDIA 3-Way and 4-Way SLI is over.
We expect the "benchmark only" mode of 3-Way and 4-Way SLI to be ready for consumers with the next "Game Ready" driver release. If you happened to get your hands on more than two GTX 1080s but aren't into benchmarking, then find those receipts and send a couple back.
So there you have it. Honestly, this is what I was expecting from NVIDIA with the initial launch of Pascal and the GeForce GTX 1080/1070 and I was surprised when I first heard about the idea of the "enthusiast key." It took a bit longer than expected, and NVIDIA will get more flak for the iterated dismissal of this very niche, but still pretty cool, technology. In the end, this won't have much impact on the company's bottom line as the quantity of users that were buying 3+ GTX GPUs for a single system was understandably small.
well we will see what happens
well we will see what happens when people start buying 3 or 4 rx 480s for 600 or 800 dollars and everyone will just start looking at the bench marking programs as there now even less relevant
Most people don’t give two
Most people don’t give two craps about it. More than 2 Way SLI has always been terrible scaling anyway and most of those who buy more than 2 cards are there to show off their e-peen or to run Heaven Benchmark and 3DMark.
Here’s my shit guys. I watch
Here’s my shit guys. I watch your podcasts on youtube everyweek. I come here and read Jeremy having a blastasticle time reeming idoit mfgrs, when writely do they SO deserve.. And that creepy guy with every kbow case to mankind. Sebastian. Then there’s the other tru nuts, Ryan, and Allyn. Shit I forgot the sex machine of the frozen wasteland. Josh.
Thing is, I love reading your shizz on site. I watch eveery podcast. I so suck!
I wonder what meat you are
I wonder what meat you are having with that Chianti and Fava beans?
opps..forgot to mention
opps..forgot to mention Scott.. you asshole, I hate you. I’ll follow you everywhere in this world to tell everone who bad you suck..lol. your cool beans too..bitch
So by limiting this, there
So by limiting this, there won’t be any way to run any game on 16k resolution (4k with DSR)? What rebate will I get for paying for 4-SLI support on my motherboard?
hmmm… i see… makes me
hmmm… i see… makes me wonder though. as i am an idiot, and lack the barest of knowledge beyond basic concepts… what is the limit of their restriction compared to the legal limit of firmware programming… its fine and dandy to say “you can’t do this because the software won’t let you.” but fairly sure that legally there isn’t much to it. you can’t alter the Nvidia code, or create a bypass program (aka hacking it) but there should still be a way dependant on method.
but hey, im the guy who hates selfish rules to the point that i refuse to accept any “concept” that i can’t find any viable argument in. EMF reading indicates paranormal activity? idk, but it is true that emf can spike and drop for absolutely no reason. (fact) Nvidia won’t let me run a x4 1080 config? mmk, how exactly does it plan to stop me, and what skills would i need to tell you if it can actually do that? (concept lacking fact outside the realm of “they said so.) after all, some crazy idiot could go the hard way and rig a full custom on a linux kernel, and code in his own hardware and firmware configs. it literally boils down to depth. unless Nvidia makes it so that the cards implode using more than 2, there’s going to be a way. the only real argument is legal or not. and even saying legal methods only, even an idiot like me knows that there are too many routes to cover, and many more than i can’t even comprehend
Here is the problem with all
Here is the problem with all the latest new tech GPUs, CPUs, MBs etc. None of the manufacturers spend the time to get it right. They change/add tech and tend to lose functionality like x3/x4 SLI. The end result is buggy systems in general including x2 SLI. It is the year 2017 correct? You would think high end tech would get better, faster, simpler, higher quality etc. Although one could argue some of these things happen in certain areas, in general this is not my experience. As a long time high end enthusiast that use to do x4 SLI, dual CPUs, sub-zero cooling etc. I am crying uncle. The manufactures have ruined my hobby to the point I cannot stand it. Unfortunately my day job requires the use of semi high end computers to develop software. On a high note PCIe/NVMe RAID 0 seemed like a bit of fresh air but the bios issues and complexities early on were just another example of EPIC fail.
I wish I read this before
I wish I read this before investing in 3 1070s… oh well. Guess I can always mine lol.