The Macintosh IIx is a personal computer designed, manufactured, and sold by Apple Computer from September 1988 to October 1990. This model was introduced as an update to the original Macintosh II, replacing the 16 MHz Motorola 68020 CPU and 68881 FPU with a 68030 CPU and 68882 FPU running at the same clock speed. The initial price of the IIx was or for the version with an 80 MB hard drive.
The 800 KB floppy drive was replaced with a 1.44 MB SuperDrive; the IIx is the first Macintosh to include this as standard.
The 68030 in the Mac IIx included 256 bytes of instruction cache and 256 bytes of data cache, providing an estimated 10-15% increase in performance over the 68020 in the Mac II. The 68882 provided up to double the floating point performance.