Well, K8 lasted 4 years but it was improved over time: dual-core, DDR2, etc.
K10 is a new architecture, although it is reworked and improved K8. Then it got some improvements with the 45nm shrink, so you can't consider Deneb/Shanghai as a K8 architecture. In the next 2 years AMD needs to (and IMO will do) rework and improve K10.5 further. They should add more execution units, improve branching and code paralelisation, add features like memory disambiguation, improve cache latencies, increase L3 speed and add additional L3 ports, etc.




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