Specifications

5–4 Upgrading the AlphaPC 164
Subject to Change – 17 January 1997
Increasing Microprocessor Speed
When replacing the microprocessor chip, the thermal conducting GRAFOIL pad
should be replaced with it. A parts kit, including the heat sink, GRAFOIL pad, two
hex nuts, heat sink clips, 60-mm fan, fan guard, and four screws is available from:
United Machine and Tool Design
River Road
Fremont NH 03044
Phone: [phone]
FAX: [phone]
When replacing the microprocessor chip with one of a different speed rating, the
clock oscillator must also be changed. Individual clock oscillators are available from
the sources listed in Appendix D. A complete kit of oscillators with supported
frequencies is available from Digital Equipment Corporation as part number
70-33058-01. Refer to Appendix F for ordering instructions.
CPU Frequency Oscillator Frequency
21164-366 36.66 MHz (default)
21164-400 40.0 MHz
21164-433 43.33 MHz
21164-466 46.66 MHz
21164-500 50.0 MHz