Dx2 meaning

A clock-doubled 486 CPU. The internal speed was doubled without changing the chip's external connections. For example, the 486DX2/66 had an internal speed of 66 MHz, while its external bus from the CPU to RAM ran at 33 MHz. See Speed Doubler and iCOMP.DX2 CPU Internal External 486DX2/66 66 MHz 33 MHz 486DX2/50 50 MHz 25 MHz 486DX/50 50 MHz 50 MHz DX4 CPU Internal External 486DX4/75 75 MHz 25 MHz 486DX4/100 100 MHz 33 MHz.