The deep and close relationship of Compaq with Intel meant that it also killed off Alpha, which unlike MIPS and PA-RISC wasn't going out by itself (Itanium was

The deep and close relationship of Compaq with Intel meant that it also killed off Alpha, which unlike MIPS and PA-RISC wasn't going out by itself (Itanium was explicitly to be PA-RISC replacement, in fact it started as one, while SGI had issues with MIPS. SPARC was reeling from the radioactive cache scandal at the time but wasn't in as bad condition as MIPS, AFAIK)