Hello,
We have an Alpha 4100, 2GB RAM ( a single RAM module ), RA7000 and DU 4.0d.
We are having CPU execptions and we think that those errors are 
coming from memory ( so far error corrected ), no panic so far. Below is dia
output.
Any comments will appreciated,
TIA,
Abdon
******************************** ENTRY    2 ******************************** 
Logging OS                        2. Digital UNIX 
System Architecture               2. Alpha 
Event sequence number             6. 
Timestamp of occurrence              11-SEP-1998 17:42:31   
Host name                            alpha1 
System type register      x00000016  AlphaServer 4000 Series 
Number of CPUs (mpnum)    x00000002 
CPU logging event (mperr) x00000000 
Event validity                    1. O/S claims event is valid 
Event severity                    5. Low Priority 
Entry type                      100. CPU Machine Check Errors 
CPU Minor class                   4. 620 System Correctable Error 
Software Flags            x0000000000000000 
Active CPUs               x00000003 
Hardware Rev              x00000000 
System Serial Number                 NI6430492T 
Module Serial Number                   
Module Type                   x0000 
System Revision           x00000000 
Machine Check Reason          x0204  IOD Detected Soft Error 
Ext Interface Status Reg  x0000000000000000 
                                     Register Contents Not Valid For This
Error 
Ext Interface Address Reg x0000000000000000 
                                     Register Contents Not Valid For This
Error 
Fill Syndrome Reg         x0000000000000000 
                                     Register Contents Not Valid For This
Error 
Interrupt Summary Reg     x0000000000000000 
                                     Register Contents Not Valid For This
Error 
WHOAMI                    x00000000  Register Contents Not Valid For This
Error 
                                       
--IOD REGISTERS FOLLOW--               
Base Addr of Bridge       x000000F9E0000000 
Dev Type & Rev Register   x06008331  CAP Chip Revision:        x00000001 
                                     HORSE  Module Revision:   x00000003 
                                     SADDLE Module Revision:   x00000003 
                                     SADDLE Module Type:        Left Hand 
                                     PCI-EISA Bus Bridge Present on PCI
Segment 
                                     PCI Class Code            x00000600 
MC Error Info Register 0  x6DF1E800 
                                     MC Bus Trans Addr<31:4>: 6DF1E800 
MC Error Info Register 1  x800E8A00  MC bus trans addr <39:32> x00000000 
                                     MC Command is ReadMod0-Mem 
                                     CPU0 Master at Time of Error 
                                     Device ID:   x00000002 
                                     MC error info valid 
CAP Error Register        x90000000  Correctable ECC err det by MDPB 
                                     MC error info latched 
MDPA Status Register      x00000000  MDPA Status Register Data Not Valid 
MDPA Error Syndrome Reg   x00000000  MDPA Syndrome Register Data Not Valid 
MDPB Status Register      x00000000  MDPB Status Register Data Not Valid 
MDPB Error Syndrome Reg   x00000000  MDPB Syndrome Register Data Not Valid 
                                       
PALcode Revision                     Palcode Rev: 1.21-3 
******************************** ENTRY    3 ******************************** 
Logging OS                        2. Digital UNIX 
System Architecture               2. Alpha 
Event sequence number             5. 
Timestamp of occurrence              11-SEP-1998 17:42:31   
Host name                            alpha1 
System type register      x00000016  AlphaServer 4000 Series 
Number of CPUs (mpnum)    x00000002 
CPU logging event (mperr) x00000000 
Event validity                    1. O/S claims event is valid 
Event severity                    5. Low Priority 
Entry type                      100. CPU Machine Check Errors 
CPU Minor class                   4. 620 System Correctable Error 
Software Flags            x0000000000000000 
Active CPUs               x00000003 
Hardware Rev              x00000000 
System Serial Number                 NI6430492T 
Module Serial Number                   
Module Type                   x0000 
System Revision           x00000000 
Machine Check Reason          x0086  Alpha Chip Detected ECC Error, From
Memory 
Ext Interface Status Reg  xFFFFFFF0C5FFFFFF 
                                     DATA SOURCE IS MEMORY OR SYSTEM 
                                     CORRECTABLE ECC ERROR 
                                     D-ref fill 
                                     EV5 Chip Rev 5 
Ext Interface Address Reg xFFFFFF006DF1E81F 
Fill Syndrome Reg         x000000000000E600 
Interrupt Summary Reg     x0000000100000000 
                                     Correctable ECC Errors (IPL31) 
                                     AST Requests 3-0:  x0000000000000000 
                                       
WHOAMI                    x00000000  CPU0 Detected This Error 
                                       
--IOD REGISTERS FOLLOW--               
Base Addr of Bridge       x0000000000000000 
                                     Register Contents Not Valid For This
Error 
Dev Type & Rev Register   x00000000  Register Contents Not Valid For This
Error 
MC Error Info Register 0  x00000000  Register Contents Not Valid For This
Error 
MC Error Info Register 1  x00000000  Register Contents Not Valid For This
Error 
CAP Error Register        x00000000  Register Contents Not Valid For This
Error 
MDPA Status Register      x00000000  MDPA Status Register Data Not Valid 
MDPA Error Syndrome Reg   x00000000  MDPA Syndrome Register Data Not Valid 
MDPB Status Register      x00000000  MDPB Status Register Data Not Valid 
MDPB Error Syndrome Reg   x00000000  MDPB Syndrome Register Data Not Valid 
                                       
PALcode Revision                     Palcode Rev: 1.21-3 
******************************** ENTRY    4 ******************************** 
____________________________________________________________________
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Received on Mon Sep 14 1998 - 14:26:02 NZST