OCP NIC Community Update For Server Workgroup February

OCP NIC Community Update For Server Workgroup February 2021 Sub-group Project wiki: https: //www. opencompute. org/wiki/Server/Mezz Mailing List: https: //ocp-all. groups. io/g/OCP-NIC SERVER NIC 3. 0

Agenda • Mechanical fit test fixture • Tall Form Factor

Mechanical fit test fixture • First article on-hand, machined from aluminum for tight tolerance • Inspection in progress and will share with mechanical key contributors soon nd • Chris identified several optimization that will trigger 2 revision

Tall Form Factor Difficult, is it impossible? Stack options in 1 OU (48 mm) envelope V V V

Tall Form Factor Can thermal challenge mitigate by more advanced cooling technique? 1 x cost 3 -4 x cost 7 -8 x cost

H 17. 8 mm + Allow uniformed dual stacking + Support QSFP-DD & OSFP-RHS. . + Allow non-NIC mini-SAS HD use-case - Unable to support PCIe CEM stacking Tall Form Factor H 20. 1 mm - Only can dual stack with H 15. 1 mm + Support OSFP, OSFP-RHS & QSFP-DD. . + Allow non-NIC mini-SAS HD use-case - Unable to support PCIe CEM stacking For 400 G & beyond, thermal challenge of next speed bump is non-trivial but is tall form factor the only solution? For 400 G & beyond, supporting QSFP-DD & OSFPRHS is the trend. However, majority of NICs in the near term is not 400 G yet. Spec definition is a forward looking but form factor could co-exist for a long time Stack options in 1 OU (48 mm) envelope V V V

Tall Form Factor Thermal Discussion Would like to check with system vendor with hot aisle implementation. Is this chart accurately reflect hot aisle system airflow capability?

OSFP-RHS and OSFP Thermal potential – 400 Gb/s NIC TSFF OSFP-RHS without heat-sink • • OSFP-RHS with small HSK on port (0. 6 mm fins height) ETSFF OSFP-RHS Case study: 400 Gb/s single port OCP 3 Project Chip power: ~25 -30 W OSFP power: ~9 W (4 x 100 Gb/s) Airflow direction: Hot. Aisle SFF – Small Form Factor, OCP NIC 3. 0 TSFF – Tall Small Form Factor, OCP NIC 3. 0 ETSFF – Extra Tall Small Form Factor, OCP NIC 3. 0 Note: *Theoretical cable only **For OSFP-RHS with HSK TFF with limit 85 deg C the curve will be the same as for OSFP-RHS without HSK with the same limit, because the chip temperature is the limitation factor for this case ETSFF OSFP