IBM 88554RU Installation Guide - Page 24

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 Feature Itanium Processor core speed 733 or 800 MHz L3 Cache 2 or 4 MB Frontside bus 266 MHz Frontside bus bandwidth 2.1 GBps Pipeline stages 10 Issue ports 9 on-board registers 328 Integer units 3 Branch units 3 Floating point units 2 SIMD units 2 Load and store units 2 (total) Itanium 2 "McKinley" 900 MHz or 1.0 GHz 1.5 or 3 MB 400 MHz, 128 bit 6.4 GBps 8 11 328 6 3 2 1 2 load and 2 store Itanium 2 "Madison" 1.3, 1.4 or 1.5 GHz 3, 4 or 6 MB 400 MHz, 128 bit 6.4 GBps 8 11 328 6 3 2 1 2 load and 2 store The Itanium 2 processor has three levels of cache, all of which are on the processor die: Level 1 cache, 32 KB 10 IBM xSeries 455 Planning and Installation Guide Eserver