Processor-controller board jumpers
Table 16 describes the jumper on the processor controller board.
Attention:
Before moving any jumpers, do the following:
1. Read the safety information in “Safety information” on page 39 through
“Handling static-sensitive devices” on page 43.
2. Turn off the server and disconnect all power cords.
Notes:
1. Be sure the processor bus-to-core ratio is set correctly (see Table 16). For
example, if you have a 700 MHz processor 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 7.0 (700/100).
2. Be sure the processor-core-frequency-selection jumper block is set for the
slowest speed processor installed in your server. For example, if your server
has a 700 MHz processor installed and you install three 900 MHz processors,
set the processor-core-frequency-selection jumper block for the 700 MHz
processor.
MHz denotes internal clock speed of the processor only; other factors also
affect application performance.
3. If you plan to use the processor serial-number security feature, you must
change the setting of the
Processor Serial Number
menu choice in the
Advanced Setup menu of the Configuration/Setup Utility program. The default
value is
Disabled
; change this value to
Enabled
, as described in “Processor
serial number access” on page 28.
Attention:
Be sure that the processor bus-to-core ratio jumper is properly set. If
the processor bus-to-core ratio does not match the processor speed in your server,
your server might operate with a degraded performance or not at all.
The highlighted number in the table corresponds to the highlighted number on the
illustration in “Processor-controller board component locations” on page 107.
Processors listed in Table 16 are not necessarily available or planned for your
model. If a processor becomes available for your model, use these jumper
settings.
Table 16. Processor-controller board jumper
Jumper name
Description
5
Processor-core-frequency-selection
The default core/bus fraction is 7.0 (700/100 MHz).
Pins 9/10 and 11/12 are open, and pins 13/14 and
15/16 are closed.
For the core/bus fraction 9 (900/100 MHz), any jumper
settings are ignored; the core frequency is set
automatically.
Note:
Open = No jumper is present.
Closed = A jumper is present.
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xSeries 370 User's Reference
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