There are some new instructions added. Plus, it's not just the processor but the kind of chip they're using on mother boards now. A lot has changed, for the better.
Also, one has to realize that, for instance, some of these new instructions can make a huge difference - more so then you'd get from simple tests - if developers decide to code them in to their products, making them a huge advantage.
Modern CPUs have things like hyper threading and turbo boost, are mounted on much more efficient chips. First generation i7 compared to recent ones? You're in for a huge surprise... It's really come a long way m8!
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