Sun Microsystems, Inc.
Each row of fan trays is occupied by two fan modules for a total of four cooling fans. In a Sun Fire X4600
server, the fan modules are populated by 172 x 160 x 51mm fans.
Figure 5-3: Sun Fire X4600 Server Cooling Fan Layout
Note: Do not operate the system for more than 60 seconds when a fan tray 2 or 3 is removed.
Power Supplies
The Sun Fire X4600 server is powered by dual redundant hot-swappable power supplies. The server requires
four power supply units (PSUs) for N+N redundancy, but up to two PSUs to power the entire system. For
optimal redundancy, two separate circuits should be used to eliminate dependence on a single electrical circuit
and provide for consistent 2+2 redundancy with the PSUs themselves.
The new 950 watt high efficiency power supplies are shipped with each system that contain the 8-DIMM
processor boards. This new power supply offers high power output to support 2+2 redundancy for a system
with fully populated 8 processors and 64 DIMMs configuration. All other systems with 4-DIMM processor
boards still have 850 watt power supplies. When upgrading the Sun Fire X4600 M2 from 4-DIMM to 8-DIMM
processor boards, it is important to make sure the PSUs are upgraded from the 850 watt to the new 950 watt
power supplies.
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