Inlet Temperature versus Airflow Requirement in Server
The following tables provide the required airflow rate and
airflow speed to the card under various operating conditions.
Note: In the following tables, the term load refers to
the total thermal power dissipation of the card.
Table 1. Inlet Temperature versus Airflow Requirement for the U280 Card at Sea Level with ~190W Load for 70°C
Rated QSFP
| Inlet Temperature
versus Airflow Requirement of PCIe Card Slot (39.62 mm x 97.54 mm) at Sea Level for
70°C Rated QSFP |
| Inlet Temperature to the Card (°C) |
Linear Feet per Minute (LFM) |
Cubic Feet per Minute (CFM) |
Pressure (inwg) |
| 5 |
300 |
12.5 |
0.37 |
| 10 |
320 |
13.3 |
0.42 |
| 15 |
350 |
14.6 |
0.50 |
| 20 |
390 |
16.2 |
0.62 |
| 25 |
440 |
18.3 |
0.79 |
| 30 |
500 |
20.8 |
1.02 |
| 35 |
570 |
23.7 |
1.32 |
| 40 |
660 |
27.5 |
1.77 |
| 45 |
750 |
31.2 |
2.28 |
| 50 (not supported) |
870 |
36.2 |
3.06 |
Table 2. Inlet Temperature versus Airflow Requirement for the
U280 Card at Sea Level with ~190W Load
for 85°C Rated QSFP
| Inlet Temperature
versus Airflow Requirement of PCIe Card Slot (39.62 mm x 97.54 mm) at Sea Level for
85°C Rated QSFP |
| Inlet Temperature to the Card (°C) |
Linear Feet per Minute (LFM) |
Cubic Feet per Minute (CFM) |
Pressure (inwg) |
| 5 |
220 |
9.2 |
0.20 |
| 10 |
230 |
9.6 |
0.22 |
| 15 |
250 |
10.4 |
0.26 |
| 20 |
280 |
11.6 |
0.32 |
| 25 |
310 |
12.9 |
0.40 |
| 30 |
350 |
14.6 |
0.50 |
| 35 |
390 |
16.2 |
0.62 |
| 40 |
450 |
18.7 |
0.83 |
| 45 |
520 |
21.6 |
1.10 |
| 50 (not supported) |
600 |
25.0 |
1.46 |
Table 3. Inlet Temperature versus Airflow Requirement for the
U280 Card above Sea Level with ~190W
Load for 70°C Rated QSFP
| Inlet Temperature
versus Airflow Requirement of PCIe Card Slot (39.62 mm x 97.54 mm) at 1200m above
Sea Level for 70°C Rated QSFP |
| Inlet Temperature to the Card (°C) |
Linear Feet per Minute (LFM) |
Cubic Feet per Minute (CFM) |
Pressure (inwg) |
| 5 |
300 |
12.5 |
0.37 |
| 10 |
320 |
13.3 |
0.42 |
| 15 |
350 |
14.6 |
0.50 |
| 20 |
390 |
16.2 |
0.62 |
| 25 |
440 |
18.3 |
0.79 |
| 30 |
500 |
20.8 |
1.02 |
| 35 |
570 |
23.7 |
1.32 |
| 40 |
660 |
27.5 |
1.77 |
| 45 |
750 |
31.2 |
2.28 |
| 50 (not supported) |
870 |
36.2 |
3.06 |
Table 4. Inlet Temperature versus Airflow Requirement for the
U280 Card above Sea Level with ~190W
Load for 85°C Rated QSFP
| Inlet Temperature
versus Airflow Requirement of PCIe Card Slot (39.62 mm x 97.54 mm) at 1200m above
Sea Level for 85°C Rated QSFP |
| Inlet Temperature to the Card (°C) |
Linear Feet per Minute (LFM) |
Cubic Feet per Minute (CFM) |
Pressure (inwg) |
| 5 |
240 |
10.0 |
0.24 |
| 10 |
250 |
10.4 |
0.26 |
| 15 |
270 |
11.2 |
0.30 |
| 20 |
300 |
12.5 |
0.37 |
| 25 |
330 |
13.7 |
0.45 |
| 30 |
370 |
15.4 |
0.56 |
| 35 |
420 |
17.5 |
0.72 |
| 40 |
480 |
20.0 |
0.94 |
| 45 |
560 |
23.3 |
1.28 |
| 50 (not supported) |
650 |
27.0 |
1.72 |