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FYI: NVIDIA No Longer Recommends 3- & 4-way SLI

Post Date: 2016-05-17
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Posts: 1674 		  Quote  Quote  Post ReplyReply bullet Topic: FYI: NVIDIA No Longer Recommends 3- & 4-way SLI
    Posted: 17 May 2016 at 4:05pm
http://www.guru3d.com/articles-pages/nvidia-geforce-gtx-1080-review,4.html

Originally posted by http://www.guru3d.com/articles-pages/nvidia-geforce-gtx-1080-review,4.html

Wait Just A Minute... So No More 3 & 4-Way SLI?

Correct, NVIDIA no longer recommends 3 or 4 way systems for SLI and places its focus on 2-way SLI only. However, for those of you that do want more than two GPUs, there is a way (albeit complex). However... meet the enthusiast key. While NVIDIA no longer recommends 3 or 4 way systems for SLI, they know that true enthusiasts will not be swayed and in fact some games will continue to deliver great scaling beyond two GPUs. For this class of user they have developed an Enthusiast Key that can be downloaded off of NVIDIA’s website and loaded into an individual’s GPU. This process involves:

1. Run an app locally to generate a signature for your GPU
2. Request an Enthusiast Key from an upcoming NVIDIA Enthusiast Key website
3. Download your key
4. Install your key to unlock the 3 and 4-way function

Full details on the process are available on the NVIDIA Enthusiast Key website, which will be available at the time GeForce GTX 1080 GPUs are available in users’ hands.
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Posts: 20391 		  Quote bprat22 Quote  Post ReplyReply bullet Posted: 17 May 2016 at 4:12pm
Interesting. Thanks for the link.   I figured this day wasn't long off, but not this quick.   

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Posts: 1674 		  Quote  Quote  Post ReplyReply bullet Posted: 17 May 2016 at 4:27pm
Yeah, for gaming loads, lots of GPUs doesn't make a lot of sense with the latencies of the interconnects...I'm wondering if it is time for a re-appearance of the Virtue.

I probably should have included the text as to why this is:

Originally posted by http://www.guru3d.com/articles-pages/nvidia-geforce-gtx-1080-review,4.html

By default, GeForce GTX 1080 SLI supports up to two GPUs. 3-Way and 4-Way SLI modes are no longer recommended. As games have evolved, it is becoming increasingly difficult for these SLI modes to provide beneficial performance scaling for end users. For instance, many games become bottlenecked by the CPU when running 3-Way and 4-Way SLI, and games are increasingly using techniques that make it very difficult to extract frame-to-frame parallelism. Of course, systems will still be built targeting other Multi-GPU software models including:

• MDA or LDA Explicit targeted
• 2 Way SLI + dedicated PhysX GPU


Edited by  - 17 May 2016 at 4:29pm
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