Once we entered into the digital age that is undoubted true. A processor works on the same computing rules no matter what it is used for. Most of the arms manufacturers cannot make all of the chips types they need so they have to be contracted. It it not so much as gaming computing is Q/A, but that the manufacturing and Q/A processes perfected for commercial releases can be further tuned up to make chips for aerospace/military applications. Typically such use will select for the most flawless chips, having a such contracts that often don't depend on the economic cycle then enables the fabs a buffer for their bottom line. So the part where they become intertwined is not necessarily a knowledge relationship, but a money/capacity relationship (like most things).