1. A mounting frame apparatus for embedding cards within an electronics system, comprising:a four-card swappable subsystem;
a chassis for containing the four-card swappable subsystem, wherein the chassis includes slots with pairs of grooves in a spaced facing relationship for swapping cards in and out of the chassis for plug and play;
wherein the grooves are U-shaped formed in the outside walls of the chassis for each of the four swappable individual cards;
a cooling structure for supplying cooling air to the four-card swappable subsystem; and
a single heatsink for cooling multiple cards is integrally formed in the four-card swappable subsystem, wherein the single heatsink is attached to the multiple cards and is a common heatsink for the multiple cards.