SUMMARY: Does RAM Placement matter in a 450?

Darvin Pope darvin_pope at hotmail.com
Wed Oct 3 11:43:06 EDT 2001


Thanks to all who responded.  Best Answers:

Hendrik Visage
______________
Yes, you wouldn't be able to get four way interleaving between the banks,
and only perhaps between banks 2&3 you might get two interleaving.
This would have some impact on the bandwidth available to the memory,
and perhaps some eratice performance, depending where in RAM the data is...


David Harrington
________________

Yes.

For memory interleaving to work, the paired banks, especially 0 & 1 [A & B 
in the E450 owner's guide, page 51] should be the same size.

With the size mix you have, you will lose some interleaving, but I would set 
banks 0 and 1, rather than 2 and 3 to matched sizes, as I think that would 
be more optimal


Original Question:

I have a 450 with 3200 MB of RAM.   banks 1 2 and 3 have 256 MB DIMMS, while
bank 0 has 32 MB DIMMs. My question is, does this make a difference at all?

System Configuration:  Sun Microsystems  sun4u Sun Enterprise 450 (4 X
UltraSPARC-II 400MHz)
System clock frequency: 100 MHz
Memory size: 3200 Megabytes

========================= CPUs =========================

                    Run   Ecache   CPU    CPU
Brd  CPU   Module   MHz     MB    Impl.   Mask
---  ---  -------  -----  ------  ------  ----
SYS     0     0      400     4.0   US-II    10.0
SYS     1     1      400     4.0   US-II    10.0
SYS     2     2      400     4.0   US-II    10.0
SYS     3     3      400     4.0   US-II    10.0



========================= Memory =========================

       Interlv.  Socket   Size
Bank    Group     Name    (MB)  Status
----    -----    ------   ----  ------
  0      none      1901    32      OK
  0      none      1902    32      OK
  0      none      1903    32      OK
  0      none      1904    32      OK
  1      none      1801   256      OK
  1      none      1802   256      OK
  1      none      1803   256      OK
  1      none      1804   256      OK
  2      none      1701   256      OK
  2      none      1702   256      OK
  2      none      1703   256      OK
  2      none      1704   256      OK
  3      none      1601   256      OK
  3      none      1602   256      OK
  3      none      1603   256      OK
  3      none      1604   256      OK

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