ENDGAME GEAR OP1 8K v2 Input Lag Test

ENDGAME GEAR OP1 8K v2 Input Lag Test: Click Latency Check

The OP1 8K v2 gives you sub-50 g weight and field-replaceable switches in a wired esports mouse. ENDGAME GEAR's model pairs a PixArt PAW3950 sensor with Kailh GX hot-swap sockets, letting you replace the primary switches without soldering. At 49.5 g and supporting up to 8000 Hz over USB-A, it targets players who want complete control over both hardware performance and switch feel without the wireless dependency of flagship mice.¹ ENDGAME GEAR lists 8000 Hz as the default polling rate, with 4000, 2000, and 1000 Hz options available.²

The default Kailh GX optical switches provide zero-debounce registration. Use this tool to verify 8000 Hz reporting and measure click latency.

Specifications¹

Polling rate and connectivity

The OP1 8K v2 supports 125, 500, 1000, 2000, 4000, and 8000 Hz over USB-A, with 8000 Hz listed as the default setting.² At 8000 Hz, position reports arrive every 0.125 ms. The wired-only design means polling rate depends entirely on USB port quality; no wireless radio scheduling introduces additional latency. For this browser test, connect to a rear motherboard USB-A port. Your Hz chart should read near 8000 on Chrome, Edge, or Firefox when the browser exposes coalesced pointer events; a ceiling at 1000 Hz despite selecting 8000 Hz in ENDGAME GEAR software indicates OS USB power management is coalescing events.³ Disable USB selective suspend to resolve power-management delays.⁴

Diagnosing a polling rate ceiling at 1000 Hz

If the chart reads at 1000 Hz despite selecting 8000 Hz in ENDGAME GEAR software, the fix follows a standard sequence. First, verify the polling rate was applied and saved in the software rather than just selected without applying. Second, move to a direct rear motherboard USB-A port. Third, disable USB selective suspend in Windows Device Manager. After each step, reconnect the mouse and rerun the test; improvement after a specific step identifies which constraint was holding your reading at 1000 Hz.

Switch technology and click latency

Kailh GX optical switches use a light-beam design with no mechanical contacts.⁵ The default GX switches register actuation without debounce delay. Building on this, the hot-swap sockets accept alternative Kailh GX variants; GX mechanical switches are available for players who prefer a different click feel at the cost of reintroducing a debounce window. Swapping to mechanical GX switches will increase click latency from the sub-2 ms optical range to approximately 3 to 8 ms. The switch type installed when you run the test determines which range your measurements fall in.

Swapping to Kailh GX mechanical switches to assess the feel difference is one of the practical advantages of the OP1 8K v2's hot-swap design. After installing mechanical switches for evaluation, run the click latency log to measure the latency increase relative to the optical baseline. Typical increases run from sub-2 ms with optical switches to 4 to 8 ms with GX mechanical switches at the default debounce setting, giving you a concrete latency cost to weigh against the preferred click feel before choosing a permanent switch configuration.

Measuring optical and mechanical baselines separately

Run the optical baseline first, then swap switches only after recording the average, spread, and any double-event count. That sequence keeps the comparison fair because the USB port, surface, and background load stay constant while the switch type changes. If the mechanical baseline is slower but stable, the result is a real debounce tradeoff rather than a setup change. Documenting both baselines in the same session with the same click technique isolates the switch variable completely; without that controlled sequence, a difference in grip or background load between sessions could make a mechanical switch look worse than it actually is.

Testing this mouse

Before testing, confirm the switch sockets are fully seated; a partially inserted switch in a hot-swap socket can cause intermittent contact that produces erratic button events in the log. Connect to a rear USB-A port and confirm polling rate in ENDGAME GEAR software. Your Hz chart should read near 8000 with low variance. If you see occasional double-click events with optical GX switches installed, try removing and firmly reinserting the switch to eliminate socket contact as a variable before adjusting debounce settings.

Hot-swap socket reliability affects this test more than it affects general mouse use. A switch that seats well enough for gaming may produce intermittent contact events when pressed off-center or at low force, which the click latency log captures as occasional double entries. Removing the suspect switch, inspecting the socket pins for bent contacts, and reinserting the switch with firm pressure until fully seated resolves most log anomalies on this model. If double events persist after reseating, testing a second switch rules out the individual switch as the cause.

Seating checks before changing switch type

A partially seated optical switch can look like a debounce problem, so inspect the socket before swapping to mechanical switches. If the socket pins look straight and the switch sits flush, then a controlled optical-to-mechanical comparison becomes much more meaningful. On the OP1 8K v2, the hot-swap sockets accept both 3-pin mechanical and 5-pin optical switches, so verifying that the switch type matches the socket pin count prevents a poor seating that produces intermittent contact. Run a quick 10-click test after each reseating to confirm the log shows clean single entries before proceeding to the full baseline measurement.

Rotating the mouse a quarter turn between reseating checks exposes socket pins that only fail under a particular hand angle. A switch that reads clean when pressed straight down may still double-fire when your grip presses it at the off-axis angle you use in game. Including that rotated press in a 10-click run through this OP1 8K socket seating test catches seating problems that a straight-down test would miss and keeps your baseline honest.