Last Revised
AST RESEARCH, INC.       INFORMATIONAL BULLETIN # 0019       10/14/97 
 
 
 
TITLE:  Second CPU Compatibility Manhattan P/V
 
 
SUMMARY 
 
   Several different versions or "steppings" of Pentium CPUs are 
   available. Manhattan P and V servers must use the proper 
   combination of these CPUs in order to function properly.
   
   Some symptoms of dual processor incompatibility are:  When 
   installing a second CPU in a Manhattan P/V system, the customer 
   may experience a problem booting or the second processor will not 
   be recognized by an operating system such as Windows NT server 
   3.51.
   
   This issue affects the following systems: 501500, 501501, 501502, 
   501503, and 501830.    
 
 
NOTES 
 
   Several different versions or "steppings" of Pentium CPUs are 
   available.  Manhattan P and V servers must use the proper 
   combination of these CPUs in order to function properly.
   
   Some symptoms of dual processor incompatibility are:  When 
   installing a second CPU in a Manhattan P/V system, the customer 
   may experience a problem booting or the second processor will not 
   be recognized by an operating system such as Windows NT server 
   3.51.
   
   The processor board MUST be a current revision to ensure proper 
   support for dual processors.  Refer to TB# 1354 for a list of 
   part numbers and revision levels for the processor boards.    
   
   This issue affects the following systems: 501500, 501501, 501502, 
   501503, and 501830. 
   
   There are two ways to determine a processor's "stepping":
   
   1. On the CPU chip itself (top and bottom sides).
   
   2. A software utility that reads Intel proprietary
      information stored in the CPU.
   
   Please use the following table to determine which CPU IC to use 
   in each socket of a 202619 CPU board (60/90, 66/100, or 66/133).  
   These are the ONLY acceptable combinations.  If a combination is 
   not listed here, do NOT use it.  
   
   PCBA part number 202619, built for 100MHz or 133 MHz CPUs (e.g. 
   202619-113), should NOT be downgraded in speed to use the B1 or 
   B3 CPU steppings.  If they are, the boards will work with a 
   single CPU but will not work correctly with dual CPUs.
   
              Primary CPU      Secondary CPU
   Freq       Marking/Step     Marking/Step
   
   90MHz      SX879/B1         SX874/B1
   90MHz      SX879/B1         SX942/B3
   90MHz      SX879/B1         SX957/B5
   90MHz      SX879/B1         SX968/C2
   
   90MHz      SX923/B3         SX874/B1
   90MHz      SX923/B3         SX942/B3
   90MHz      SX923/B3         SX957/B5
   90MHz      SX923/B3         SX968/C2
   
   90MHz      SX957/B5         SX874/B1
   90MHz      SX957/B5         SX942/B3 
   90MHz      SX957/B5         SX957/B5
   90MHz      SX957/B5         SX968/C2
   
   90MHz      SX968/C2         SX874/B1
   90MHz      SX968/C2         SX942/B3 
   90MHz      SX968/C2         SX957/B5
   90MHz      SX968/C2         SX968/C2
   
   100MHz     SX963/C2         SX963/C2
   
   133MHz     SK106/cB1        SK106/cB1
   133MHz     SK106/cB1        SK107/cB1
   133MHz     SK107/cB1        SK106/cB1
   133MHz     SK107/cB1        SK107/cB1
   
   The following additions do not use the P5ID.EXE file to view the 
   stepping.  You must look at the processor chip to identify the 
   stepping.
   
   133MHz     SK106/SSS        SY022/SSS
   133MHz     SY022/SSS        SY022/SSS
   
   For additional information on dual processor configurations, see 
   Technical Bulletin # 1286.
   
   Contact AST's Technical Support at (800) 727-1278 to verify that 
   the processor board in your system is at the correct revision 
   level to support dual processors.
   
   File P5ID.EXE identifies the primary CPU's stepping.  This file 
   is available from any of AST's On-Line! services as follows:
      
         AST WWW Site:  http://www.ast.com
         AST On-Line! BBS*:  See IB0001.TXT
         CompuServe:  GO: ASTFORUM
         Prodigy:   JUMP: ASTSUPPORT
      
         * Refer to IB0001.TXT for a list of AST's 
           international BBS numbers.
    
   To decompress this file, create a temporary directory on your 
   hard drive, copy the downloaded file to that directory, and run 
   the file.    
 
 
TAN 002120DZ, 001241EM 
 
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