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10–2 Thermal Management
Alpha 21264/EV67 Hardware Reference Manual
Operating Temperature
Table 10–2 lists the values for the center of heat-sink-to-ambient (θ
c
a) for the 21264/
EV67 587-pin PGA. Tables 10–3 through 10–8 show the allowable T
a
(without
exceeding T
c
) at various airflows.
Table 10–2 θ
c
a at Various Airflows for 21264/EV67
Airflow (linear ft/min) 100 200 400 800 1000
θ
c
a with heat sink type 1 (°C/W) 2.0 1.2 0.65 0.40 0.37
θ
c
a with heat sink type 2 (°C/W) 1.4 0.78 0.45 0.33 0.31
θ
c
a with heat sink type 3
1
(°C/W)
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
— 0.38 —
Table 10–3 Maximum T
a
for 21264/EV67 @ 600 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) — — 37.3 53.8 55.8
Maximum T
a
with heat sink type 2 (°C) — 28.7 50.5 58.4 59.7
Maximum T
a
with heat sink type 3
1
(°C)
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
— 55.1 —
Table 10–4 Maximum T
a
for 21264/EV67 @ 667 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) — — 30.7 48.9 51.1
Maximum T
a
with heat sink type 2 (°C) — 21.2 45.3 54.0 55.5
Maximum T
a
with heat sink type 3
1
(°C)
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
— 50.4 —
Table 10–5 Maximum T
a
for 21264/EV67 @ 700 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) — — 26.9 46.1 48.4
Maximum T
a
with heat sink type 2 (°C) — — 42.2 51.5 53.0
Maximum T
a
with heat sink type 3
1
(°C)
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
— 47.6 —
Table 10–6 Maximum T
a
for 21264/EV67 @ 733 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) — — 24.0 44.0 46.4
Maximum T
a
with heat sink type 2 (°C) — — 40.0 49.6 51.2
Maximum T
a
with heat sink type 3
1
(°C)
1
Heat sink type 3 has a 80 mm × 80 mm × 15 mm fan attached.
— 45.6 —