DX2 CPUs were also marketed as OverDrive chips. The actual speed of the CPU was double the motherboard frequency. The only part of the DX2 chip that didn't run at double speed is the region of the chip to handle the in and out between the CPU and the rest of the computer. The OverDrive chip was installed in the second socket on the system board effectively turning off the 486-SX. In the last days of the 80486, a few DX4 CPUs saw daylight outside of Intels factories.
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