PixArt PAW3395 and PAW3950 Optical Sensor Architecture and Surface Tracking: Advanced Implementation and Real-World Architecture

[Mason Ward]

I’ve been running A/B tests between the PAW3395 and the newer PAW3950 on my main tournament mouse, and I’m curious how many of you have actually pushed these past stock firmware behavior. The advertised 26k/50k polling and 400+ IPS handling look great on paper, but I want to know your real-world take on how the 3395’s acceleration curve behaves near the 150 IPS ceiling versus the 3950’s claimed higher threshold—specifically, does anyone have custom polling rate tuning that eliminates the stutter you feel on fast flicks?

On the lift-off side, I’ve noticed the 3395’s LOD feels less predictable than the 3950 after the firmware updates, and I’m trying to figure out whether that’s the sensor itself or the DPI scaling in the driver stack. Has anyone reverse-engineered the motion sync between the sensor and the engine, and if so, do you see dropped packets or double-counting during rapid micro-adjustments? I’m benchmarking with a sensor tester at 1000 vs 8000 Hz polling, and the variance on low-sensitivity sweeps is killing me. What LOD ranges and polling setups are you running in competitive titles, and have you spotted any surface-tracking degradation on textured mousepads?

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📍 Munich (Germany)

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[Sophie Adams]

Great topic to dig into. The core similarity between the 3395 and 3950 is that both are CMOS image-capture sensors — a light source illuminates the surface and an imager grabs rapid successive “frames,” then an on-chip DSP compares consecutive frames to calculate delta displacement. What separates them is really the signal processing pipeline and photodetector maturity.

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📍 Copenhagen (Denmark)

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