Toms Hardware: The Change to Megapixels
Regarding the Logitech MX mice:
So it looks like 400dpi mice move up to 20 inches per second. Does this really mean the MX mice are superior to the Intellimouse 3.0 series, no.
Regarding the Logitech MX mice:
Then an idea crossed my mind: suppose I called the Logitech mouse manager to see. I spoke to him for two minutes, explaining my problem with the figures and he replied straight off: 30x30 sensor, speed of 5250 images per second. So I didn't know whether to be pleased at having almost gotten it right or to kick myself for not asking earlier. Logitech made me feel a fool. They also have another interesting figure, which is the 40 inches per second maximum tracking speed. The MX is once more ahead, because older sensors were below 20.
So it looks like 400dpi mice move up to 20 inches per second. Does this really mean the MX mice are superior to the Intellimouse 3.0 series, no.