There are two types of hammer drill:
These drills use a piston action to compress air which works in combination with hardended striking parts. Concrete for example, should only be drilled with this type of hammer drill.
These drills use a clutch to engage two grooved hardened plates against each other. The impacts created (Blows Per Minute) are in the thousands, but the force is minimal and these drills are designed for softer materials such as bricks or solid plaster. The manufacture of such drills is cheaper than pneumatic and if they are subjected to concrete the parts will wear quickly.
SDS is a Bosch-developed shank system used almost exclusively by pneumatic drills.
Is it wrong to be in love with a sawbench?