Even with the advanced flight characteristics of a modern fighter, I’d guess they don’t really need the power modern chips are capable of offering.

I mean, it’s not just fly-by-wire. If they do any signal processing in CPU or GPU they’d need power - and I’m sure they do for the higher level processing, since they’re always updating things like target identification and electronic countermeasures to keep pace.

The F-35, for example, also famously has all kinds of automatic combat information and networked communications management, and includes a display that allows pilots to virtually see through the floor. It adds up to 4 million lines of code or so. (All proprietary and controlled by America, which has made Canada’s acquisition deal a political hot potato post-Trump)