in and 1.7 in heights, with the nominal value being 30 mm. When 1U rackmount servers started becoming popular, these form factor registered DIMMs had to plug into angled DIMM sockets to fit in the 1.75 in high box. To alleviate this issue, the next standards of DDR DIMMs were created with a "low profile" (LP) height of around 1.2 in. These fit into vertical DIMM sockets for a 1U platform.

With the advent of blade servers, angled slots have once again become common