IBM 86607SU Hardware Maintenance Manual - Page 237

Processor board jumpers Table 9 on page 230 contains the names and descriptions of the jumper blocks located on the processor board. The highlighted numbers in the table refer to the highlighted numbers in the illustration in "Processor board component locations" on page 227. Notes 1. Turn off the server, and disconnect the power cords before moving any jumpers. 2. Be sure the microprocessor bus-to-core fraction is set correctly. For example, if you have a 350 MHz microprocessor installed and the system bus speed is 100 MHz (the default), be sure that the jumpers are set to a bus-to-core fraction of 3.5 (350/100). Refer to jumpers J27-J30 in Table 9 on page 230 and Table 10 on page 231. MHz denotes internal clock speed of the microprocessor only; other factors also affect application performance. Attention If installing or changing to a different speed processor than the original processor, be sure to change the processor core-frequency selection jumpers on the processor board. If the microprocessor bus-to-core fraction is incorrect, system board components will overheat and component damage might occur. Netfinity 5500 - Type 8660 229