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AMD Announces New Desktop Zen 3 Chips With 2 New APUs and the Ryzen 7 5700X3D
(www.anandtech.com)
This is a most excellent place for technology news and articles.
0.4Ghz on the base clock is kind of a big difference when you can't overclock that headroom back. I'd personally wait till the benchmarks are out to really gauge how much you are giving up.