What technologies came to the PC world from High Performance Computing?

What technologies came to the PC world from High Performance Computing?

Recently I came to think about the technologies that supercomputers gave to the modern PCs. I found out that the instruction pipelining appeared in one of the first CDC machines and parallelism was certainly a super-computer hallmark of all the times. But it seems that such "features" like co-processors and cache-memory were initially invented for the "mainstream" computers.