IBM 86802SY Hardware Maintenance Manual - Page 174

Processor Board Jumpers, Table 13. Processor Board Jumpers

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Processor Board Jumpers Table 13 describes the jumpers on the processor board. The highlighted numbers in the table correspond to the highlighted numbers on the illustration in "Processor Board Component Locations" on page 165. Notes 1. Turn off the server, and disconnect the power cord before moving any jumpers. 2. Be sure the microprocessor bus-to-core ratio is set correctly. For example, if you have a 450 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 ratio of 4.5 (450/100). Refer to jumpers J43-J46 in Table 13. 3. Be sure to set the Microprocessor Core Frequency Selection jumper block for the slowest speed microprocessor installed in your server. For example, if your server has a 400 MHz microprocessor installed and you install three 450 MHz microprocessors, set the Microprocessor Core Frequency Selection jumper block for the 400 MHz microprocessor. MHz denotes internal clock speed of the microprocessor only; other factors also affect application performance. Attention If the microprocessor bus-to-core ratio is incorrect, board components will overheat and component damage might occur. Be sure that the microprocessor bus-to-core ratio jumper is properly set. Table 13. Processor Board Jumpers Jumper Name 3 Microprocessor core frequency selection (J43-J46) Description The default core/bus fraction is 4.0 (400/100 MHz). Jumpers are installed on pins 1 and 2 of J44, J45 and J46, and jumpers are installed on pins 2 and 3 of J43. For the core/bus fraction 4.5 (450/100 MHz), the jumpers are installed on pins 1 and 2 of J44, and J46, and jumpers are installed on pins 2 and 3 of J43 and J45. For the core/bus fraction 5.0 (500/100 MHz), the jumpers are installed on pins 2 and 3 of J43, and J44, and jumpers are installed on pins 1 and 2 of J45 and J46. For the core/bus fraction 5.5 (550/100 MHz), the jumpers are installed on pins 2 and 3 of J43, J44, and J45, and jumpers are installed on pins 1 and 2 of J46. 166 Netfinity Server HMM

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Processor Board Jumpers
Table
13 describes the jumpers on the processor board.
The highlighted numbers in the table correspond to the
highlighted numbers on the illustration in “Processor Board
Component Locations” on page
165.
Notes
1.
Turn off the server, and disconnect the power
cord before moving any jumpers.
2.
Be sure the microprocessor bus-to-core ratio is
set correctly.
For example, if you have a 450
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 ratio of 4.5
(450/100).
Refer to jumpers J43–J46 in
Table 13.
3.
Be sure to set the Microprocessor Core
Frequency Selection jumper block for the slowest
speed microprocessor installed in your server.
For example, if your server has a 400 MHz
microprocessor installed and you install three 450
MHz microprocessors, set the Microprocessor
Core Frequency Selection jumper block for the
400 MHz microprocessor.
MHz denotes internal clock speed of the
microprocessor only; other factors also affect
application performance.
Attention
If the microprocessor bus-to-core ratio is incorrect,
board components will overheat and component
damage might occur.
Be sure that the microprocessor
bus-to-core ratio jumper is properly set.
Table 13. Processor Board Jumpers
Jumper Name
Description
±3²
Microprocessor
core frequency
selection (J43–J46)
The default core/bus fraction is 4.0 (400/100
MHz).
Jumpers are installed on pins 1 and 2
of J44, J45 and J46, and jumpers are
installed on pins 2 and 3 of J43.
For the core/bus fraction 4.5 (450/100 MHz),
the jumpers are installed on pins 1 and 2 of
J44, and J46, and jumpers are installed on
pins 2 and 3 of J43 and J45.
For the core/bus fraction 5.0 (500/100 MHz),
the jumpers are installed on pins 2 and 3 of
J43, and J44, and jumpers are installed on
pins 1 and 2 of J45 and J46.
For the core/bus fraction 5.5 (550/100 MHz),
the jumpers are installed on pins 2 and 3 of
J43, J44, and J45, and jumpers are installed
on pins 1 and 2 of J46.
166
Netfinity Server HMM