IBM eserver xSeries 350 User Reference Manual page 47

The following illustration shows the location of the microprocessor speed (core-
frequency selection) jumper block on the system board. The jumpers on this block are
in the following order, from top to bottom: J13, J27, J28, and J29. See "Installing a
microprocessor" on page 55 for the jumper speed settings.
Note: Any system-board jumper blocks that are not shown in the illustrations in this
book are reserved.
Microprocessor
speed jumpers
J13
J27
J28
J29
1 2 3
Chapter 5. Installing options
35