INTERPOLATED DPI(software acceleration)
Interpolated DPI is the use of software (usually found within the device driver) to artificially increase the DPI of the mouse. This inherently decreases accuracy of the mouse.
Interpolation is usually done by the device driver, but can also be achieved by lens magnification and software installed on the firmware of the mouse to alter the information given by the sensor.

Interpolated DPI is extraneous movement data that is used to "fool" the computer in believing a sensor is generating more counts than it actually is. This is done by generating counts in between existing counts and is a detrimental feature that Razer mice will never use because it reduces accuracy.
Manufacturers who implement Interpolated DPI are the main beneficiaries. By using interpolation, these manufacturers do not need to use high quality sensors to transmit movement data as the driver will use algorithms to adjust the movement data accordingly.

TRUE DPI(hardware acceleration)
True DPI describes the use of the native capabilities of the mousing sensor and its algorithms to determine how a sensor is being moved. A sensor certified with True DPI is a sensor that does not use interpolation to generate movement data to be given to the computer.
True DPI does not use algorithms, lens magnification or any other types of "tricks" to calculate your movement data. True DPI relys solely on what your sensor reports to generate movement data.

Using True DPI ensures that no "junk" movement data is used to determine how your mouse is moving. Interpolated data will make assumptions and "guess" where your mouse was in between actual reports received from the sensor and could position your cursor incorrectly.
If positioning your cursor to exactly where you intended to move it to is important to you, then True DPI is a feature that you will definitely appreciate when playing FPS, RTS or any type of game that requires tracking precision.
tired d zzz
see you tommorow 4am haha