Another oddball CPU “module”, without a known socket name. This one powered a Sun workstation at one point in time, and is the only one I have that’s not installed in something at the moment.
Sun UltraSPARC IIi 5039-02 270Mhz CPU Module
The module itself doesn’t have any active cooling, but has several heatsinks – possibly for active VRM modules on the left, and the CPU on the right.
It uses a strange combination of blade and pin connectors, and was Made in the UK in Week 29 of 1998.
Undoing the bolts frees the top heatsink from the module, and reveals the base uses a bed of nails sort of connector to make contact with the CPU. This method is only more well known to consumers when Intel released their LGA series of CPUs.
In the case of this CPU, the lands are square in shape.