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Alpha 21264/EV67 Hardware Reference Manual
Thermal Management 10–3
Heat Sink Specifications
10.2 Heat Sink Specifications
Three heat sink types are specified. The mounting holes for all three are in line with the
cooling fins.
Figure 10–1 shows the heat sink type 1, along with its approximate dimensions.
Table 10–7 Maximum T
a
for 21264/EV67 @ 750 MHz and @ 2.0 V with Various Airflows
Airflow (linear ft/min) 100 200 400 800 1000
Maximum T
a
with heat sink type 1 (°C) — — 22.1 42.6 45.1
Maximum T
a
with heat sink type 2 (°C) — — 38.5 48.4 50.0
Maximum T
a
with heat sink type 3
1
(°C) — 44.3 —
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
Table 10–8 Maximum T
a
for 21264/EV67 @ 833 MHz and @ 2.0 V with Various Airflows
Airflow (linear ft/min) 100 200 400 800 1000
Maximum T
a
with heat sink type 1 (°C) ——— 36.339.1
Maximum T
a
with heat sink type 2 (°C) — — 31.8 42.7 44.5
Maximum T
a
with heat sink type 3
1
(°C) — 33.8 —
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.