The Sun Blade 1000, introduced in October 2000, was the first system to use Fireplane as the interconnect between its single or dual processors and the I/O subsystem, a few months ahead of its use in the new Sun Fire server product line.
The 1500/2500 series came in two variants, the earlier "red" series, and the later "silver" series. The "silver" series were enhanced versions of the "red" series - a faster CPU being the key differentiator.
The product line's name was not a reference to "blade server" systems, a term not yet in common use in 2000. In 2006, Sun did introduce an unrelated "Sun Blade" blade server product line.