One PC — How Many Rack Boxes Can You Control?

Buyers often ask how many phone farm boxes (racks) one computer can manage. The answer depends on USB topology and software load — not a fixed marketing number.

Starting point: one standard rack = up to ~20 device slots connected through one powered industrial USB hub uplink to the control PC.

One Windows or Linux PC with a single stable USB 3.0 host port can typically commission and operate one fully loaded rack (~20 Android nodes via ADB) when using a quality powered hub matched to node count.

Adding a second rack on the same PC: possible with a second powered hub on a separate USB host controller (different motherboard port or PCIe USB card). Avoid daisy-chaining consumer hubs — voltage drop causes random ADB disconnects.

Practical lab tiers: 1 PC → 1 rack (up to 20 nodes) is the most stable default. 1 PC → 2 racks (~40 nodes) needs 32GB RAM, discrete GPU if mirroring many screens, and two isolated hub uplinks. 3+ racks → plan a second control workstation or a dedicated rack-control mini-PC per row.

iPhone farms: macOS control station recommended. One Mac typically manages one iPhone rack row for Xcode/TestFlight workflows — multi-rack iOS labs often use one Mac per 10–20 devices depending on tooling.

Screen mirroring load: viewing thumbnails for 20+ devices increases GPU and RAM use. Lower mirror resolution or use a second PC for monitoring if the primary station runs CI deploy jobs.

Network path alternative: some toolchains use LAN/OTG device modes — document USB vs LAN per slot in your wiring map. See /knowledge-base/otg-lan-network-connection.

Remote Control Setup SKU includes hub path verification and workstation layout recommendation for your node count.

Full spec table: /docs/hardware-spec-quick-reference