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it says the i7-6500U is about +31% faster in single-core speed than the FX-4100.
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And an FX4100 can rather easily overclock 31% to 4.5-4.6Ghz which should bring parity at single thread performance. While single thread still rules for gaming neither processor is going to be a beast for that: but it should utterly destroy it multi-threaded which is more important than ever in today's OS's and apps. That will make the whole Windows 10 and web browsing experience much smoother, given sufficient memory. Push it even further, 4.6-4.8Ghz is commonly done even on decent air coolers, and get the better of it all around.
But the thing OP is comparing to is a "U" suffix laptop part with 15W TDP...wouldn't that normally be extremely thermally constrained? That would perforce make the 4100 with a 95W TDP better at multi-thread work and explain higher ranking in MT benchmarks even stock.
Bulldozer certainly had it's faults but overclocking potential, especially considering the relative ease of it, mitigated many of them for the willing. It still makes it perfectly good for office productivity apps and web browsing.