Valve Steam Controller Review | Latency Benchmarks, Battery Life, Repairability

The new Valve Steam Controller, launching on May 4th at an MSRP of $100, was tested for latency, battery life, and its use of Tunnel Magnetoresistant (TMR) thumb sticks. This controller is a complete overhaul of Valve's 2015 Steam Controller, designed to leverage the Steam Deck's control platform. A major focus of the new controller is its TMR analog sticks, which Valve touts as a significant improvement over traditional potentiometers and Hall effect sensors. To understand this technology, a 3D animation was created. Potentiometers, the cheapest and most common method for measuring stick movement, involve a carbon contact and a metal wiper. As the wiper moves, resistance changes, which can be translated to a linear position. However, direct contact causes wear and dirt accumulation, leading to stick drift and requiring larger dead zones. Hall effect sensors, which have been around since the Sega Saturn 3D pad in 1996, use magnetic fields to curve the path of electrons, creating a measurable potential difference that translates to position. They are non-contact, avoiding mechanical wear, but require more power and signal amplification. TMR sensors combine the benefits of both: they create a low-power voltage divider circuit like a potentiometer but operate contact-free like a Hall effect sensor. This is achieved by two ferromagnetic layers separated by a thin insulative barrier. Quantum tunneling allows some electrons to pass through, and when a magnet aligns the magnetic fields, tunneling increases, lowering resistance. Valve describes TMR as an incremental improvement, offering a better balance of power, cost, and performance. Latency testing was conducted using an NVIDIA LDAT. Wired performance was excellent, averaging 19 milliseconds of full system latency (button press to on-screen photon response) across 499 clicks, with a standard deviation of 3.1. This was only 4 milliseconds higher than a high-performance gaming mouse. The Steam Controller's proprietary wireless puck performed almost identically, averaging 21.6 milliseconds with the same 3.1 standard deviation. Even with a second Steam Controller connected to the puck, latency remained stable at 21.9 milliseconds, indicating no significant downside to wireless use with the puck. For comparison, a generic Xbox One controller (model 1537) connected via USB showed a worse average of 22.6 milliseconds. In a "Bluetooth nightmare" scenario with seven other controllers connected via Bluetooth, the puck's performance was minimally impacted, with average latency creeping up to 21.8 milliseconds. However, using the Steam Controller alone on Bluetooth resulted in significantly worse latency (37.3 milliseconds) and consistency (20.6 standard deviation). With seven other Bluetooth controllers and no puck, the Steam Controller became almost unusable, with an average latency of 73.8 milliseconds and 101 missing log entries (representing latencies over 200 milliseconds or complete failures to register clicks). This demonstrates that Bluetooth does not scale well with multiple devices and is not the optimal connection method; wired or puck connections are superior. Battery life testing involved continuously spamming input, resulting in nearly 73 hours of operation. This supports Valve's claim of 35+ hours, as real-life duration would be less due to haptic motors and other factors. A separate rumble test, though incomplete due to time constraints, indicated over 24 hours of life. The controller took 3 hours and 26 minutes to fully charge using a Steam Deck charger. The puck is only for charging, with the data connection remaining wireless. Valve justified the internal battery by citing long battery life and ease of charging, without sacrificing repairability. Each Steam Controller comes with a puck wireless adapter, which is separate from the Steam Frame dongle. Each puck can connect to four controllers, and each controller can remember pairings with two pucks. The puck uses Valve's proprietary 2.4 GHz wireless protocol. In range testing, the puck achieved a direct line-of-sight range of about 146 feet (44.5 meters) outdoors before losing signal. Bluetooth range was more variable but could achieve even greater distances with a suitable paired device. The controller requires the Steam client beta for initial setup but will not for customers at launch. It features an infrared LED for Steam Frame tracking (which reduces battery life), and when paired with a Steam Machine, it can wake it from a low-power state. Users can quickly toggle between Bluetooth and puck modes directly from the controller hardware, a convenient feature for those with multiple systems. The Steam Controller can open the Steam on-screen keyboard, though it requires the Steam client to be running and won't work over the Windows lock screen. Gamepad functionality for non-Steam games requires launching them through Steam due to the Steam input translation layer. The new trackpads offer a "believable click" through haptics, replacing the mechanical clicks of the original Steam Controller. Haptic motors also generate notification chimes and emulate normal rumble in games. The controller is designed for easy serviceability, using non-security Torx screws that Valve chose for their robustness. Replacement parts will be available through iFixit after launch, though Valve is assessing demand for individual pucks. The external topography will be made public for 3D printing accessories. Valve began work on this version of the Steam Controller after the successful launch of the Deck OLED in 2023, aiming to extend the Deck's control experience to docked or PC use. Unlike the original, which focused on bringing PC inputs to a controller, the new controller aims to replicate the Deck, offering a better balance for both gamepad and PC games. It features two analog sticks, a departure from the original. While Valve considered PS5-style adaptive triggers, matching the Deck's features was a higher priority. For casual gamers, the $100 price point might be a barrier compared to mainstream alternatives. However, the Steam Controller's strengths lie in living room PC gaming, thanks to its trackpads, and future integration with the Steam Frame and Steam Machine. Initial impressions from an experienced user highlighted seamless connection, automatic switching between desktop and game controls, and refined trackpad controls. The controller's shape, however, was noted as being squarer with parallel grips, which could bring elbows closer together. The extensive customization options for every button, gyro, and capacitive sensor are a positive for enthusiasts but might be overwhelming for mainstream users. Compatible prefab Deck control profiles offer a solution for most games. In conclusion, the Steam Controller demonstrates impressive objective performance in latency and battery life, and its TMR sticks promise improved longevity and smaller dead zones. Its repairability is also a significant positive. While the subjective experience, like comfort and the depth of customization, may vary by user, the controller is well-suited for users who appreciate the Steam Deck's controls or desire a robust solution for living room PC gaming.