Processors also tend to run hot, while RAM is more reliable when cool. Much like some parts in human biology benefit from being outside of the core (enough to

Processors also tend to run hot, while RAM is more reliable when cool. Much like some parts in human biology benefit from being outside of the core (enough to make it an evolutionary benefit even when it's quite an obvious defect due to vulnerability), having RAM in it's own cooling sub-domain makes sense, and since it's already out there the blade interconnect card design is space, cost, and cooling effective.