What is CEB Form Factor
CEB is the acronym for The Compact Electronics Bay Specification. It is a standard form factor designed for use by dual processor motherboards. The requirement was first proposed for value servers as well as workstations based on the Intel XEON processor. The dimensions of the CEB motherboard are 12 x 10.5 inch (305mm x 267mm).
The Xeon microprocessor is a CPU used in a multiprocessing or in a multi-socket-capable environment. It is an x86 microprocessor from Intel Corporation. This CPU belongs in a business or engineering server, workstation or embedded system markets. x86 microprocessors are typically 32 bit CPUs.
The CEB motherboards have an architecture structure similar to ATX IO connectors. They also have identical motherboard mounting holes as the ATX motherboards have, not withstanding the fact that the SSI CEB motherboards are bigger in size than ATX motherboards. They also have unusual processor mounting holes. By that it is clear that the rear panel opening has the same design for the EEB as well as ATX specification. There are expansion cards mounted on an SSI CEB motherboard which look similar to an ATX motherboard.
Several features stand out. For one, thermal energy behavior was standardized. Next, the arrangement of the processors was well defined, so the classification of the primary processor as well as the secondary appears deliberate and clear. This meant that a standard could be created for other components to be designed around in support of the form factor. But it was even used for motherboards that have only one processor, as long as the primary processor would be provided first.
This image shows the different dimensions of various form factors. The SSI CEB is slightly bigger than the ATX, but smaller than the Extended ATX/ SSI CEB form factor.