The Macintosh IIx was the first Macintosh to ship with a Motorola 68030 processor. The IIx was introduced in September 1988 and discontinued in October 1990. The IIx is not a 32-bit clean Macintosh.
Introduced in September 1988, the Mac IIx was essentially the same as a Mac II, but had a 68030 processor with a 68882 FPU (it was the first Mac with either). The IIx sold for $7,769. The IIx was discontinued in October 1990.
Codename: Spock, Stratos. The IIx originally shipped with system software 6.0.1.
Motorola 68030 processor clocked at 16MHz. The IIx also featured a 68882 math co-processor.