The Best Connector You’ve Never Heard Of: OCuLink
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Get access to millions of impactful stock images and videos at lmg.gg OCuLink is a pretty awesome connector that carries PCI Express signals and has some advantages over Thunderbolt - so why is it so uncommon on consumer electronics? Leave a reply with your requests for future episodes. ► GET MERCH: lttstore.com ► GET EXCLUSIVE CONTENT ON FLOATPLANE: lmg.gg ► SPONSORS, AFFILIATES, AND PARTNERS: lmg.gg FOLLOW US ELSEWHERE --------------------------------------------------- Twitter: twitter.com Facebook: @LinusTech Instagram: @linustech TikTok: @linustech Twitch: twitch.tv
OCuLink is introduced as an open PCI Express based connector with a compact form factor that was designed to compete with Thunderbolt and USB. The video explains that OCuLink stands for Optical Copper Link, originally envisioned as a hybrid copper and optical fiber solution, but the fiber portion proved inefficient over short distances so the design settled on copper signaling. Developed by PCI-SIG, the standard has evolved through OCuLink 2.0, launched in 2017, which supports up to four PCIe 4.0 lanes and delivers up to 64 Gbps of bidirectional bandwidth. The host notes that there is also an eight-lane variant that can exceed the four-lane configuration in sheer throughput and is comparable to what Intel's Thunderbolt 5 promises, albeit with differences in modularity and implementation. A key highlight is OCuLink’s cost effectiveness, which remained attractive especially before Thunderbolt became royalty-free, thanks to cheaper components and manufacturing demands. The presenter emphasizes that OCuLink’s blend of high performance and lower cost has driven strong adoption on servers, where reliability and performance at scale matter most. Despite its strengths, the video clarifies that OCuLink is not a universal all-in-one solution like Thunderbolt, as it transfers only PCIe data and lacks native video, power, or USB signaling, which necessitates separate cables and systems to manage power and peripheral connectivity. The discussion contrasts consumer-facing usability, where Thunderbolt benefits from DisplayPort signaling and USB-C compatibility, with OCuLink’s more focused data-transfer role, suggesting a practical but narrower consumer footprint. The speaker closes by acknowledging that future iterations or new specialized connectors could further improve on OCuLink, maintaining the theme that there is always room for a better, faster, and more integrated interface while appreciating the current trade-offs between versatility and efficiency.
Topics · technology · hardware · connectors · data-transfer · pci-express · gpu · storage
Questions answered
- What does OCuLink stand for and what problem was it trying to solve compared to Thunderbolt?
- OCuLink stands for Optical Copper Link, aiming to provide high-speed PCIe data transfer with a competitive cost profile relative to Thunderbolt, prioritizing performance and efficiency over broad multi-function capabilities like video and power delivery.
- How does OCuLink hardware configuration affect performance, and what are the consumer implications?
- OCuLink can use multiple PCIe 4.0 lanes (up to 4 or 8 in different variants) to achieve up to 64 Gbps total bandwidth in the 4-lane configuration, but it does not natively carry video or power, which means consumer setups require separate cables for power and displays and are less convenient than Thunderbolt.