Re: Ryzen
@9Rune5 - They ended up with some QC issues early with the 486DX line. To add insult to injury - the "487" was actually a full 486DX that pretty much took over.
For the Threadrippers, they have their own controllers for current gen. The new Gen Ryzens separate out what is effectively the Northbridge (that AMD integrated into the core cpu with K8, and Intel did with Nehalem) into a separate unit and shared across the compute units. It makes sense with ever expanding core counts, but we'll have to see what it does in real life. Since it's on die, it's faster than an external northbridge, and reduces complexity of the cores, but could introduce some extra latency for RAM, and I/O.