Editing Scalable Link Interface (section)

==SLI HB==
In May 2016 Nvidia announced that the [[GeForce 10 series]] would feature a new SLI HB (High Bandwidth) bridge; this bridge uses 2 SLI fingers on the [[Printed circuit board|PCB]] of each card and essentially doubles the available bandwidth between them. Only GeForce 10 series cards support SLI HB<ref name=tpu10808gb/><ref name=":0"/> and only 2-way SLI is supported over this bridge for single-GPU cards.<ref name=tpu10808gb>{{cite web|url=http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080/3.html|title=Nvidia GeForce GTX 1080 8 GB|author=W1zzard|date=May 17, 2016|publisher=TechPowerUp|access-date=August 28, 2024|archive-url=https://web.archive.org/web/20160521031101/http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_1080/3.html|archive-date=2016-05-21|url-status=live}}</ref> SLI HB interface runs at 650&nbsp;MHz, while legacy SLI interface runs at slower 400&nbsp;MHz.<ref name=ocguide/>

Electrically there is little difference between the regular SLI bridge and the SLI HB bridge. It is similar to two regular bridges combined in one PCB. The signal quality of the bridge improved, however, as the SLI HB bridge has an adjusted trace-length to make sure all traces on the bridge have exactly the same length.<ref name=ocguide>{{Cite web|url=http://overclocking.guide/nvidia-hb-sli-bridge-technical-review/|title=NVIDIA HB SLI Bridge: A Technical Review - Overclocking.Guide|date=2016-08-11|language=en-US|access-date=2016-08-11|archive-url=https://web.archive.org/web/20160909210227/http://overclocking.guide/nvidia-hb-sli-bridge-technical-review/|archive-date=2016-09-09}}</ref>

A PC gaming magazine did a comparison between SLI bridges and their SLI HB successors with X-rays, and found differences in the PCB tracing allowed clock rates to go up from 400&nbsp;MHz to 650&nbsp;MHz and thus the data rates along with that. With the increased bus width a noticeable bandwidth increase should be expected; however tests with a GTX 1080 GPU showed the improvements in gaming performance were marginal. Newer HB bridges are LED illuminated (often back-side-illuminating some logo) and as a result more costly than earlier bridges at a comparable base functionality.<ref>{{Cite web|url=https://www.pcgameshardware.de/Pascal-Codename-265448/News/HB-SLI-Bruecke-Unterschiede-1204297/|title = Nvidia HB-SLI-Brücke: Unterschiede anhand von Röntgenbildern gezeigt|date = 12 August 2016}}</ref>