Compaq 164SX - Manual (Page 38)

3–2 Power and Environmental Requirements
Environmental Requirements
3.2 Environmental Requirements
The 21164PC microprocessor is cooled by a small fan blowing directly into the
chip’s heat sink. The AlphaPC 164SX motherboard is designed to run efficiently by
using only this fan. Additional fans may be necessary depending upon cabinetry and
the requirements of plug-in cards.
The AlphaPC 164SX motherboard is specified to run within the environment listed
in Table 3–2.
3.3 Board Dimensions
The AlphaPC 164SX is an ATX-size printed-wiring board (PWB) with the following
dimensions:
• Length: 30.48 cm (12.0 in ±0.0005 in)
• Width: 24.38 cm (9.6 in ±0.0005 in)
• Height: 6.00 cm (2.4 in)
The board can be used in certain desktop and deskside systems that have adequate
clearance for the 21164PC heat sink and its cooling fan. All ISA and PCI expansion
slots are usable in standard desktop or deskside enclosures.
Table 3–2 AlphaPC 164SX Motherboard Environmental Requirements
Parameter Specification
Operating temperature 10°C to 40°C (50°F to 104°F)
Storage temperature –55°C to 125°C (–67°F to 257°F)
Relative humidity 10% to 90% with maximum wet bulb temperature 28°C
(82°F) and minimum dew point 2°C (36°F)
Rate of (dry bulb) temperature
change 11°C/hour ± 2°C/hour (20°F/hour ± 4°F/hour)