What are these gray boxy components with R50 written on them? (Photo attached)
These are SMD inductors


The cubic parts marked R50 are 0.50 μH SMD inductors. The R is used to indicate a decimal point.
Internally, these inductors are coils of wire wrapped around a metal core, encased in a rigid block to suppress coil noise.
These inductors are used as part of the CPU voltage regulator, in tandem with the capacitors to the right of them in the photo and MOSFETs beneath the heatsinks (branded "DrMOS").