|  |     I'll repost 511.1 here with the appropriate part numbers.  The short 
    answer is, yes H7150-AA is the PCI option for the newer boxes, DH-53Z2A-AA 
    is the drawer upgrade for the older boxes.
    
    Todd
    
    
    
      <<< MVBLAB::SYS$SYSDEVICE:[NOTES$LIBRARY]ALPHASERVER_4100.NOTE;1 >>>
                             -< AlphaServer 4100 >-
================================================================================
Note 511.1                      PCI I/O expansion                         1 of 1
MOVMON::DAVIS                                        33 lines  27-FEB-1997 10:57
                        -< Dodge/Wrangler (II)/Durango >-
--------------------------------------------------------------------------------
    You can't get the PCI I/O expansion parts now because they won't fit in
    existing drawers.  Here's what the scenario looks like, where Dodge is
    the 4100 (4 CPUs, 8 PCI), Wrangler is the current 4000 (2 CPUs, 8 PCI),
    Wrangler II is the new 4000 without I/O (2 CPUs, 8 PCI), and Durango is 
    the new 4000 with I/O (2 CPUs 16 PCI):
    
    
              +--------+            +----------+              +-------+
              |  4100  |            |  4000    |              | 4100  |
              |(Dodge) |            |(Durango) |              |(Dodge)|
              +--------+            +----------+              +-------+
                    ^                ^        ^                 ^
        CPU upgrade |    I/O upgrade |        | I/O upgrade     | CPU upgrade
             Drawer |         Drawer |        | PCI option      | Drawer  
  (WNT) DN-51Z1L-AA |    DH-53Z2A-AA |        | H7150-AA        | DN-51Z1L-AA
  (UNX) DA-51Z1J-AA |                |        |                 | DN-51Z1J-AA
  (VMS) DY-51Z1K-AA |                |        |                 | DY-51Z1K-AA
                +----------------------+    +-----------------------+
                |    4000 (Wrangler)   |    |   4000 (Wrangler II)  |
                |   Dodge sheet metal  |    |  Durango sheet metal  |
                | Wrangler motherboard |    |  Durango motherboard  |
                +----------------------+    +-----------------------+
                      ORIGINAL BOX                  NEW BOX 
                   (WNT) DN-52*AA-*A              DN-53*EA-**
                   (UNX) DA-52*AB-*A              DA-53*EB-*A
                   (VMS) DY-52*AB-*A              DY-53*EB-*A
    
    So, no, you can't ever upgrade a 4100 (Dodge)with more PCI, just the 4000. 
    The current box upgrades with a drawer swap.  If you buy a Wrangler II
    box, you can upgrade with just the I/O parts (Horse and Saddle
    modules).
    
    I think there will also be a "side-grade" part number, where you can go
    from a 4100 (with a Dodge motherboard, 4 CPU capable with 8 PCI) to a 
    4000 (with a Durango motherboard, 2 CPU capable with 16 PCI).
    
    Todd
 |