The OSFP form factor's superior heat dissipation surface area makes it more viable than QSFP-DD for the 1. 6T era, preventing “thermal throttling” in high-density AI nodes. In developing both 800G and 400G OSFP (Octal Small Form-factor Pluggable) modules, PAM4 technology. This specification defines the electrical connectors, electrical signals and power supplies, mechanical and thermal requirements of the OSFP Module, connector and cage systems. The OSFP Management interface is described in a separate document, Common Management Interface Specification for 8/16X. As pluggable modules scale to 400G and beyond, thermal management becomes a primary reliability constraint. This article explains contemporary thermal strategies for OSFP modules — from fin geometry tuning to detachable heatsink covers — and maps measured performance to practical deployment steps. Thermal and electrical shielding techniques and arrangements are disclosed to enable OSFP modules to operate at higher bandwidths. OSFP-compatible technologies are discussed, including the use of water. With the boom of AI servers spurring demand for higher data rates, OSFP (octal small-form-factor pluggable) modules rated up to 15 watts, and QSFP-DD (quad small-form-factor, pluggable, double-density) modules rated up to 12 watts, are widely manufactured. OSFP (Octal Small Form-factor Pluggable).