Cache Size Frequency 900MHz 1.0GHz 1.3GHz 1.4GHz 1.5GHz 1.6GHz 1.5MB A A         3MB   A B       4MB        B C & D**   6MB          B C & D** 9MB           C & D**

A = Intel® Itanium® 2 Processor with up to 3MB L3 Cache BIOS (PR9.2 or later) B = Intel® Itanium® 2 Processor with up to 6MB L3 Cache BIOS (PR4.1) C = Intel® Itanium® 2 Processor with up to 9MB L3 Cache BIOS (PR1.3) Note: Do NOT Support A2 processor stepping D = Intel® Itanium® 2 Processor with up to 9MB L3 Cache BIOS (PR2.1) * *Note: Required for support of A2 processor stepping.  Mixed A1 & A2 steppings are also supported.

This applies to:

Intel® Server System SR870BN4