Pentium 4 with bugs
The Pentium 4, which will be available from yesterday, was released with a lot of bugs. 40 errors are already known, of which Intel has classified 26 as so serious that they were immediately entered in the 'specification' for elimination.
In comparison, the Pentium II had 24 errors at launch. Some of the errors are negligible and almost never occur, but there is also the error that the Pentium 4 does not handle overlapping areas correctly when shifting strings.