10
IBM
Eserver
xSeries 455 Planning and Installation Guide
The processor-board assembly is also equipped with LEDs for light path
diagnostics for the following components:
Each processor
Each power module (“pod”)
In addition, a “remind” button is located on the upper side of the processor-board
assembly. Pressing this button while the processor-board assembly is not
attached to AC power will illuminate any light path LEDs for 10 seconds that had
been lit while the system was under power.
Intel Itanium 2 processors
The Itanium 2 processor used in the x455 is code named “Madison”. It uses a
ZIF socket design and its small form factor is what allows up to four processors in
a 4U dense machine.
Table 1-4 outlines some of the differences between the Itanium and Itanium 2
processors (both the “Madison” and the earlier “McKinley” processor).
Table 1-4 Itanium v Itanium 2 processors
The Itanium 2 processor has three levels of cache, all of which are on the
processor die:
Level 1 cache, 32 KB
Feature
Itanium
Itanium 2 “McKinley”
Itanium 2 “Madison”
Processor core speed
733 or 800 MHz
900 MHz or 1.0 GHz
1.3, 1.4 or 1.5 GHz
L3 Cache
2 or 4 MB
1.5 or 3 MB
3, 4 or 6 MB
Frontside bus
266 MHz
400 MHz, 128 bit
400 MHz, 128 bit
Frontside bus bandwidth
2.1 GBps
6.4 GBps
6.4 GBps
Pipeline stages
10
8
8
Issue ports
9
11
11
on-board registers
328
328
328
Integer units
3
6
6
Branch units
3
3
3
Floating point units
2
2
2
SIMD units
2
1
1
Load and store units
2 (total)
2 load and 2 store
2 load and 2 store
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