Inlet Temperature versus Airflow Requirement in Server - Inlet Temperature versus Airflow Requirement in Server - DS1014

Alveo U45N Data Center Accelerator Card Data Sheet (DS1014)
Document ID
DS1014
Release Date
2023-06-23
Revision
1.0 English

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
  1. 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
  1. 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
  1. 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
  1. A card without QSFP allocates more power in the FPGA than one with QSFP.