From the Intel Users guide PDF page 24 When two processors are installed, both must be of identical revision, core voltage, cache size, and
bus/core speed. When a single processor is installed, it must be in the socket labeled CPU1.
From the Intel Users guide PDF page 24 When two processors are installed, both must be of identical revision, core voltage, cache size, and
bus/core speed. When a single processor is installed, it must be in the socket labeled CPU1.
It depends on if your bios is up to date or if you have the correct bios, and some old multiple CPU boards don't have single CPU support but I haven't found one yet that doesn't have that support.