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G9 vs G9x - What's The Difference?
Logitech decided to upgrade the G9, but instead of replacing the old model they decided to create a new model to sell alongside it - this is the G9x.
The only change in the G9x is a new laser sensor that is capable of 5000dpi, has a tracking speed of up to 150 inches/second (depending on the surface used) and works at up to 30g of acceleration. That compares to the G9 with its 3200dpi laser engine, maximum tracking speed of 65 inches/second and maximum of 20g. Both sensors have a polling rate of 1000Hz, or 1/1000th of a second between scans.
Other than that the mice are the same - they both come with the two basic shells, both support custom colour LEDs and both have the weight mechanism.
At the moment Logitech are offering the same retail price of $99 for both mice so the argument of G9 vx G9x is easy - buy the G9x and if you don't want 5000dpi just lower the maximum with the driver software. However, other retailers might not be charging the same, so if there's a price difference you have to decide if you want to pay extra for the G9x and its 5000dpi.