Will that hub or dock slow your SSDs, or even make them faster?

Original Article ↗ Hacker News Discussion ↗

Thunderbolt and USB‑C docks promise single‑cable simplicity but often introduce trade‑offs in SSD speed, display support, reliability, and wake‑from‑sleep behavior. Commenters compare popular dock brands and NVMe enclosures, note flaky chipsets and driver quirks (especially with DisplayLink), and highlight how bandwidth sharing can halve real‑world throughput. The thread also critiques Apple’s expensive, non‑upgradeable internal storage, arguing that external NVMe drives over Thunderbolt usually offer better capacity‑per‑dollar despite added complexity and latency.

Dock experiences & reliability

  • Several users report good long-term experience with CalDigit TS3+/TS4 and OWC Thunderbolt docks (multi‑year daily use, stable Ethernet, displays, and SSDs).
  • Others strongly warn against certain CalDigit models (notably TS3+), citing early deaths, flaky USB ports, and repeated warranty replacements.
  • One detailed report traces instability to Fresco Logic USB controllers on the TS3+; ports on the ASMedia controller and Thunderbolt are described as reliable.
  • Kensington and Plugable docks get positive mentions for build quality and stability. Some cheaper or brand‑new docks (including from Alogic) reportedly fail after ~1 year.

Display support & DisplayLink vs native TB

  • Some docks require DisplayLink on macOS for multiple displays; users find the software buggy and note limitations (no display until OS boots, no text console).
  • Thunderbolt docks/hubs can drive multiple displays natively on Macs, but are limited by the SoC:
    • Dual external displays only on Pro/Max chips or base M4; base M1/M2/M3 can’t be “fixed” by a dock.
  • Confusion over “3+ monitor” marketing; some devices rely on TB passthrough rather than truly independent outputs.

External NVMe performance via docks

  • Mac and PC users see high throughput from NVMe in Thunderbolt 3/4 enclosures, though usually slower than internal SSDs.
  • Some note wake‑from‑sleep quirks where NVMe volumes take seconds to minutes to remount, making them unsuitable for dotfiles/home dirs.
  • On Linux, complex PCIe bus enumeration with TB4 docks can cause variable performance and hot‑plug fragility; kernel versions and boot parameters matter.

Apple internal SSD pricing vs consumer NVMe

  • Multiple comments argue Apple’s SSD upgrades are heavily marked up (e.g., $600–$800 for 2TB) compared with high‑end consumer NVMe drives (~$130–$200 for 2TB, even 4–8TB still cheaper).
  • Debate over whether “gaming” SSDs (e.g., WD Black SN850X, Samsung 990 Pro/Evo) are a fair comparison:
    • One side: same TLC NAND tier, similar performance/endurance; Apple is simply price‑gouging.
    • Other side: trade‑offs in power, longevity, controller design, binning, and over‑provisioning make direct price comparisons imperfect; Apple may optimize differently, though no hard data is provided.
  • Consensus that Apple overcharges for storage, even if exact “fair” premium is unclear.

USB4, Thunderbolt & naming confusion

  • Strong frustration with USB naming (USB 3.2 variants, “USB4 2.0”) and the gap between technical and marketing terms.
  • Some suggest USB should effectively be replaced at the high end by Thunderbolt, which is perceived as clearer and more consistently specified.
  • Others counter that mandating TB everywhere would raise device and cable costs unnecessarily, especially for low‑speed peripherals and microcontrollers.

Cable choices, cost, and fast charging

  • A few users now default to Thunderbolt cables for anything important (data, video, power) to avoid capability confusion, accepting higher cost.
  • Others say they’ve rarely had issues with ordinary USB cables and prefer cheaper, thinner, more flexible ones for simple charging or peripherals.
  • Discussion on fast charging:
    • Some see limited value (phones charged overnight), others rely on it in time‑pressured or travel scenarios.
    • For laptops, higher‑power USB‑C/TB cables and chargers are often essential.
    • Slower charging can benefit battery longevity, but overheating is identified as the real risk factor.

Form factors & integrated storage

  • Several users wish more docks included internal NVMe slots to reduce “box clutter”; only a few Thunderbolt options (OWC, WD “game dock”, Steam Deck‑style hubs) are mentioned.
  • One long‑term report of an OWC 14‑port TB3 dock plus Samsung T7 SSD on a Mac mini notes years of trouble‑free operation, including reliable wake‑from‑sleep mounting.