Hardware Reference
In-Depth Information
Socket 939 and 940
Socket 939 is used with the Socket 939 versions of the AMD Athlon 64, 64 FX, and 64 X2 (see
Figure 3.17
). It's also used by some versions of the AMD Opteron processor for workstations and
servers. Motherboards using this socket support conventional unbuffered DDR SDRAM modules in
either single- or dual-channel mode, rather than the server-oriented (more expensive) registered
modules required by Socket 940 motherboards. Sockets 939 and 940 have different pin arrangements
and processors for each and are not interchangeable.
Figure 3.17. Socket 939. The cutout corner and triangle at the lower left indicate pin 1.
Socket 940 is used with the Socket 940 version of the AMD Athlon 64 FX, as well as most AMD
Opteron processors (see
Figure 3.18
)
. Motherboards using this socket support only registered DDR
SDRAM modules in dual-channel mode. Because the pin arrangement is different, Socket 939
processors do not work in Socket 940, and vice versa.
