Anker 577 PowerExpand Review: 8.3/10 - Versatile Thunderbolt 4 Hub
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The Anker 577 PowerExpand earns an 8.3/10 out of 10 as a well-designed Thunderbolt 4 hub for users with modern Thunderbolt peripherals.
laptop users wanting seamless single-cable connectivity for external displays and peripherals with the Anker 577 PowerExpand
your laptop has enough native ports or your workflow doesn't require the extra connectivity of the Anker 577 PowerExpand
Prices last checked July 22, 2026
Overview
The Anker PowerExpand 577 Thunderbolt 4 Hub (model A8398) is a compact docking solution that prioritizes Thunderbolt device connectivity over a wide variety of legacy ports. Priced at $249, it offers three Thunderbolt 4 downstream ports, an upstream Thunderbolt 4 port with 85 watts of laptop charging, and a 2.5 gigabit Ethernet port. Its slim, aluminum-clad design makes it ideal for users who need to connect multiple Thunderbolt peripherals and external drives. Unlike Thunderbolt 3 docks such as the CalDigit TS3 Plus, the Anker 577 uses Thunderbolt 4 protocol which guarantees minimum PCIe bandwidth, wake-from-sleep reliability, and DMA protection.
Design and Build
The Anker 577 is an elegant aluminum bar measuring 8.3 inches long, 2.2 inches wide, and just 0.6 inches tall, with a design that matches Apple’s aesthetic perfectly. Weighing approximately 490 g (17.3 oz), it has a solid feel that belies its compact size. The compact footprint takes up minimal desk space, and the included 36-inch Thunderbolt 4 cable offers flexibility in positioning. The top surface features a subtle Anker logo, and the aluminum enclosure serves as a passive heatsink to keep the dock cool under load.
Thunderbolt 4 Connectivity
The defining feature of the Anker 577 is its three Thunderbolt 4 downstream ports, each delivering 40 Gbps bandwidth for connecting external SSDs, eGPUs, or additional Thunderbolt displays. One downstream port supports up to 20W charging for connected devices, making it useful for powering a phone or tablet. The upstream port delivers 85W of laptop charging, which is sufficient for all but the most power-hungry 16-inch workstations. Thunderbolt 4 guarantees minimum PCIe 3.0 x4 bandwidth (32 Gbps), wake-from-sleep reliability, and Intel VT-d-based DMA protection against Thunderbolt attacks - features that set it apart from Thunderbolt 3 hubs.
Display Support
Through a single Thunderbolt 4 host connection, the Anker 577 supports up to two 4K displays at 60 Hz or a single 6K display at 60 Hz, leveraging DisplayPort Alt Mode over Thunderbolt. Unlike docks with dedicated HDMI or DisplayPort outputs, the display support is entirely dependent on the Thunderbolt downstream ports, which requires monitors with USB-C Thunderbolt input or the use of USB-C to HDMI or DisplayPort adapters.
Ethernet and USB-A
The built-in 2.5 gigabit Ethernet port is a genuine advantage over older Thunderbolt 3 docks still limited to 1 gigabit speeds. There are no USB-A ports on the hub itself, which is a notable omission for users who still rely on legacy peripherals. Anker includes a USB-C to USB-A adapter in the box, but the lack of native USB-A is a limitation compared to traditional docks.
Power Supply
The Anker 577 uses an external 120W power brick that delivers 85W to the laptop and the remaining 35W to power the hub and its connected peripherals. The power brick is compact for its wattage but adds to the cable clutter behind the desk. The hub supports power delivery negotiation, ensuring that connected devices receive the appropriate amount of power without overloading.
Pros
- Three Thunderbolt 4 downstream ports for modern peripherals and external SSDs
- 85W laptop charging through the upstream port
- 2.5 gigabit Ethernet for faster wired networking
- Compact, elegant aluminum design takes minimal desk space
- Thunderbolt 4 guarantees wake-from-sleep reliability and DMA protection
Cons
- No display output ports (HDMI or DisplayPort) requires adapters for monitors
- No native USB-A ports - USB-C to USB-A adapter is included but inconvenient
- Expensive at $249 for what is essentially a port expander, not a full dock
- External 120W power brick adds cable clutter behind the desk
Verdict
The Anker 577 PowerExpand earns an 8.3/10 out of 10 as a well-designed Thunderbolt 4 hub for users with modern Thunderbolt peripherals. The three downstream Thunderbolt 4 ports and 2.5 gigabit Ethernet are genuinely useful, and the build quality is excellent. The lack of any display output ports or USB-A ports limits its versatility compared to traditional docks, and the $249 price is steep for what is essentially a Thunderbolt expander rather than a full-function dock.
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Technical Specifications
How We Scored This Product
Every product on ComfyTechCheck is scored on a 1 to 10 scale across four criteria. Each criterion is weighted differently depending on the product category to reflect what matters most to real buyers.
- Performance & Capabilities 40% Speed, accuracy, quality of output in its category.
- Build & Design Quality 30% Materials, construction quality, durability, form factor.
- Consumer Value 20% Price-to-performance ratio relative to direct competitors.
- User Experience 10% Ease of setup, daily usability, comfort, ergonomics.
Scores are assigned by our editorial team after hands-on testing or extensive research using verified user reports, expert analysis, and technical specifications. For the full weight breakdown by category, visit our How We Rate page.