The following tables provide the required airflow
rate and airflow speed to the U45N accelerator card under various operating
conditions.
Note: These are early estimates that might change when
more accurate details on TDP and power allocation among devices become
available.
Table 1. Normal Flow at Sea Level
Inlet Temperature vs Airflow
Requirement of PCIe Card Slot
(98.4 mm x 20.33 mm) at Sea Level for 115W Total Card Power |
Inlet Temperature to
the Card (°C) |
With QSFP (85°C) |
Without QSFP
1
|
CFM |
LFM |
Static Pressure |
CFM |
LFM |
Static Pressure |
25 |
7.7 |
359 |
0.26 |
5.9 |
274 |
0.16 |
30 |
9.1 |
423 |
0.34 |
6.7 |
313 |
0.20 |
35 |
11.0 |
510 |
0.46 |
7.8 |
362 |
0.25 |
40 |
13.6 |
632 |
0.65 |
9.1 |
425 |
0.32 |
45 |
17.6 |
816 |
1.00 |
10.9 |
508 |
0.43 |
50 |
24.0 |
1115 |
1.73 |
13.4 |
622 |
0.60 |
55 |
35.9 |
1666 |
3.57 |
16.9 |
787 |
0.91 |
- A card without QSFP
allocates more power in the FPGA than one with QSFP.
|
Table 2. Normal Flow at 1200m Above Sea Level
Inlet Temperature vs Airflow
Requirement of PCIe Card Slot
(98.4 mm x 20.33 mm) at 1200m Above Sea Level for 115W Total Card
Power |
Inlet Temperature to the Card
(°C) |
With QSFP (85°C) |
Without QSFP
1
|
CFM |
LFM |
Static Pressure |
CFM |
LFM |
Static Pressure |
25 |
8.2 |
382 |
0.29 |
6.3 |
294 |
0.18 |
30 |
9.7 |
450 |
0.38 |
7.2 |
336 |
0.22 |
35 |
11.7 |
543 |
0.51 |
8.4 |
389 |
0.28 |
40 |
14.5 |
673 |
0.72 |
9.8 |
457 |
0.36 |
45 |
18.7 |
869 |
1.12 |
11.8 |
547 |
0.49 |
50 |
25.6 |
1187 |
1.93 |
14.4 |
671 |
0.69 |
55 |
38.2 |
1774 |
4.01 |
18.3 |
849 |
1.04 |
- A card without QSFP
allocates more power in the FPGA than one with QSFP.
|
Table 3. Reverse Flow at Sea Level
Inlet Temperature vs Airflow
Requirement of PCIe Card Slot
(104.57 mm x 13.18 mm) at Sea Level for 115W Total Card
Power |
Inlet Temperature to
the Card (°C) |
With QSFP (85°C) |
Without QSFP
1
|
CFM |
LFM |
Static Pressure |
CFM |
LFM |
Static Pressure |
25 |
6.3 |
295 |
0.43 |
7.3 |
341 |
0.36 |
30 |
7.3 |
340 |
0.54 |
8.5 |
393 |
0.46 |
35 |
8.5 |
397 |
0.71 |
9.9 |
460 |
0.60 |
40 |
10.2 |
472 |
0.96 |
11.8 |
546 |
0.82 |
45 |
12.3 |
572 |
1.35 |
14.3 |
663 |
1.15 |
50 |
15.3 |
711 |
2.00 |
17.8 |
825 |
1.71 |
55 |
19.7 |
915 |
3.18 |
22.9 |
1062 |
2.72 |
- A card without
QSFP allocates more power in the FPGA than one with
QSFP.
|
Table 4. Reverse Flow at 1200m Above Sea Level
Inlet Temperature vs Airflow
Requirement of PCIe Card Slot
(104.57 mm x 13.18 mm) at 1200m Above Sea Level for 115W Total Card
Power |
Inlet Temperature to
the Card (°C) |
With QSFP (85°C) |
Without QSFP
1
|
CFM |
LFM |
Static Pressure |
CFM |
LFM |
Static Pressure |
25 |
6.8 |
316 |
0.48 |
7.9 |
365 |
0.41 |
30 |
7.8 |
364 |
0.61 |
9.1 |
422 |
0.52 |
35 |
9.2 |
426 |
0.80 |
10.6 |
494 |
0.68 |
40 |
10.9 |
507 |
1.09 |
12.6 |
587 |
0.93 |
45 |
13.3 |
616 |
1.54 |
15.4 |
713 |
1.31 |
50 |
16.5 |
767 |
2.29 |
19.1 |
889 |
1.96 |
55 |
21.3 |
987 |
3.66 |
24.7 |
1146 |
3.13 |
- A card without QSFP
allocates more power in the FPGA than one with QSFP.
|