Specifications

3–2 Power and Environmental Requirements 9 March 1999 – Subject To Change
Environmental Requirements
3.2 Environmental Requirements
The 21164 microprocessor is cooled by a small fan blowing directly into the chip’s
heat sink. The AlphaPC 164LX 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 164LX motherboard is specified to run within the environment listed
in Table 3–2.
3.3 Board Dimensions
The AlphaPC 164LX 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: 6.86 cm (2.7 in)
The board can be used in certain desktop and deskside systems that have adequate
clearance for the 21164 heat sink and its cooling fan. All ISA and PCI expansion
slots are usable in standard desktop or deskside enclosures.
Table 3–2 AlphaPC 164LX 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)