what is ideal temp for US-III+

Hi all,
is it okay for US-III+ running at 1200 MHZ to excced 75� C on sun fire 880
here's the output when i ran

prtdiag -v

on sunfire 880 running solaris10

bash-3.00# prtdiag -v
System Configuration:  Sun Microsystems  sun4u Sun Fire 880
System clock frequency: 150 MHz
Memory size: 8192 Megabytes

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

           Run   E$  CPU    CPU
Brd  CPU   MHz   MB Impl.   Mask
--- ----- ---- ---- ------- ----
 A    0   1200  8.0 US-III+ 11.1
 B    1   1200  8.0 US-III+ 11.1
 A    2   1200  8.0 US-III+ 11.1
 B    3   1200  8.0 US-III+ 11.1

========================= Memory Configuration ===============================

           Logical  Logical  Logical
      MC   Bank     Bank     Bank         DIMM    Interleave  Interleaved
 Brd  ID   num      size     Status       Size    Factor      with
----  ---  ----     ------   -----------  ------  ----------  -----------
  A    0     0       512MB   no_status     256MB     8-way        0
  A    0     1       512MB   no_status     256MB     8-way        0
  A    0     2       512MB   no_status     256MB     8-way        0
  A    0     3       512MB   no_status     256MB     8-way        0
  B    1     0       512MB   no_status     256MB     8-way        1
  B    1     1       512MB   no_status     256MB     8-way        1
  B    1     2       512MB   no_status     256MB     8-way        1
  B    1     3       512MB   no_status     256MB     8-way        1
  A    2     0       512MB   no_status     256MB     8-way        0
  A    2     1       512MB   no_status     256MB     8-way        0
  A    2     2       512MB   no_status     256MB     8-way        0
  A    2     3       512MB   no_status     256MB     8-way        0
  B    3     0       512MB   no_status     256MB     8-way        1
  B    3     1       512MB   no_status     256MB     8-way        1
  B    3     2       512MB   no_status     256MB     8-way        1
  B    3     3       512MB   no_status     256MB     8-way        1

========================= IO Cards =========================


                         Bus  Max
     IO   Port Bus       Freq Bus  Dev,
Brd  Type  ID  Side Slot MHz  Freq Func State Name                              Model
---- ---- ---- ---- ---- ---- ---- ---- ----- --------------------------------  ----------------------
I/O  PCI   8    B    0    33   33  5,0  ok    SUNW,XVR-100                      SUNW,375-3181

No failures found in System
===========================


========================= Environmental Status =========================

System Temperatures (Celsius):
-------------------------------
Device          Temperature     Status
---------------------------------------
CPU0             76             OK
CPU1             73             OK
CPU2             75             OK
CPU3             71             OK
MB               47             OK
IOB              44             OK
DBP0             45             OK

=================================

Front Status Panel:
-------------------
Keyswitch position: NORMAL

System LED Status:
                   GEN FAULT                REMOVE
                    [OFF]                    [OFF]

                   DISK FAULT               POWER FAULT
                    [OFF]                    [OFF]

                   LEFT THERMAL FAULT       RIGHT THERMAL FAULT
                    [OFF]                    [OFF]

                   LEFT DOOR                RIGHT DOOR
                    [OFF]                    [OFF]

=================================

Disk Status:
          Presence      Fault LED       Remove LED
DISK   0: [PRESENT]        [OFF]           [OFF]
DISK   1: [PRESENT]        [OFF]           [OFF]
DISK   2: [PRESENT]        [OFF]           [OFF]
DISK   3: [PRESENT]        [OFF]           [OFF]
DISK   4: [PRESENT]        [OFF]           [OFF]
DISK   5: [PRESENT]        [OFF]           [OFF]
DISK   6: [  EMPTY]
DISK   7: [  EMPTY]
DISK   8: [  EMPTY]
DISK   9: [  EMPTY]
DISK  10: [  EMPTY]
DISK  11: [  EMPTY]

=================================

Fan Bank :
----------

Bank                        Speed         Status        Fan State
                           ( RPMS )
----                       --------      ---------      ---------
CPU0_PRIM_FAN                3191        [ENABLED]          OK
CPU1_PRIM_FAN                3333        [ENABLED]          OK
CPU0_SEC_FAN                    0        [DISABLED]         OK
CPU1_SEC_FAN                    0        [DISABLED]         OK
IO0_PRIM_FAN                 4054        [ENABLED]          OK
IO1_PRIM_FAN                 3846        [ENABLED]          OK
IO0_SEC_FAN                     0        [DISABLED]         OK
IO1_SEC_FAN                     0        [DISABLED]         OK
IO_BRIDGE_PRIM_FAN           3703        [ENABLED]          OK
IO_BRIDGE_SEC_FAN               0        [DISABLED]         OK

=================================

Power Supplies:
---------------
                                                    Current Drain:
Supply     Status     Fan Fail  Temp Fail  CS Fail  3.3V   5V   12V   48V
------  ------------  --------  ---------  -------  ----   --   ---   ---
PS0      GOOD                                         6     3     2     3
PS1      GOOD                                         5     3     2     3
PS2      GOOD                                         6     3     2     3


========================= HW Revisions =======================================

System PROM revisions:
----------------------
OBP 4.13.0 2004/01/19 18:26

IO ASIC revisions:
------------------
         Port
Model     ID  Status Version
-------- ---- ------ -------
Schizo    8     ok      7
Schizo    9     ok      7

75 sounds about right.

If the default high temperature warning threshold is 95 and shutdown is 100. I had a look at a couple of boxes to compare and I have a range of 73 - 78 on machines that are doing a moderate amount of work.

thanks for your helpful reply
one more question if you please how can i set temperature warning threshold or which file should i modify