AMD's Socket 939 Offers More with Much of the Same

Socket 940, 939, 754

Obviously the situation is different today, as Athlon64 FX does not work in dual setups. In addition, it is the most expensive Socket 940 processor. But Opteron is the workstation and server level processor, while Athlon64 is supposed to conquer the mass market. One reason for the differentiation is the request to build four-layer motherboards for Athlon64, as most Socket 940 solutions make use of more complex six-layer designs.

The Socket 939 platform also supports HyperTransport operation at 1 GHz (running in double data rate mode) rather than the common 800 MHz. This results in a total bi-directional bandwidth of 8 GB/s rather than 6.4 GB/s. Chipsets need to support that, but NVIDIA, SiS and VIA did their homework already. nForce3 250 Ultra, SiS755FX/756 and K8T800 Pro are ready for Socket 939 while AMD has no ambitions to design a chipset itself.

Sentenced to death: Socket 940 will soon vanish from the retail shops.

Socket 754 will remain and gradually replace Socket A.

As you can see, there is only one pin difference between the two processor types (lower left corner).

The dual channel memory controller requires 185 more pins (on the right).

Patrick Schmid
Editor-in-Chief (2005-2006)

Patrick Schmid was the editor-in-chief for Tom's Hardware from 2005 to 2006. He wrote numerous articles on a wide range of hardware topics, including storage, CPUs, and system builds.