OSFP Riding Heat Sink (OSFP-RHS) is a 9.5mm high pluggable module which does not have an integrated heat sink. In place of SFP’s integrated heat sink, OSFP-RHS cage shall have a riding heat sink. To prevent insertion of OSFP-RHS into a standard OSFP cage, the shape and location of the positive stop have been changed. See the following Table for a comparison between the OSFP-RHS and OSFP.
| OSFP-RHS feature | Comment |
| Module | 9.5mm height without heat sink and different positive stop; for the feature that is not explicitly specified for OSFP-RHS, the same specification as of OSFP shall be applied. |
| Connector | Identical with Surface Mount Connector |
| Host PCB Board Layout | Identical with Surface Mount type |
| Cage | Port height/positive stop/bezel cutout is different with OSFP |
| Insertion/Extraction/Retention | No change; |
| Durability | Identical with OSFP |
| Thermal Requirement | Identical with OSFP |
| Airflow Requirement | Not applicable |
| Electrical and Management interface | Identical with OSFP |
There may be a custom OSFP-RHS with height different than 9.5mm but otherwise having all other attributes of OSFP-RHS. Details of such custom height OSFP-RHS are not provided in the OSFP MSA.
