After digging though my office for random bits, stealing from other systems, sacrificing some parts from a planned ebay part ITX build I started, but had no case for and a little 3D printing and zip ties to fill in the gaps of a makeshift body on a monitor stand, this abomination what brought online.
When powered, its first words to me were "What is my purpose?" and I said "To fold for LTT!", and that is what it is doing ever since...
None of the chips in the 3000 series have ample headroom for overclocking. They are all pretty much maxed out from the box with factory settings. BIOS updates, your motherboard VRM, a good cooler.. will help slightly to potentially reach higher speeds but it's more of a tweaking thing than anything else. Or the ability for the PC to run quietly on max load. Overlocking is pretty much non existent, and in benchmarks with 3600X, 3700X and 3900X.. the stock factory settings often run faster in games. It's usually only in highly threaded workloads that the Manual OC performs faster. Sometimes disabling SMT does a higher percentage improvement.. but that's not something you generally want to turn off. It's possible to play around with affinity in Windows, to disable certain threads for custom applications, especially with a program like Process Lasso.
You are right in that no one got samples of 3800X. There will be a few days or a week delay before the proper reviews start surfacing. It's likely that it will be very similar to 3700X, maybe with a slight improvement. The main difference between the two is that thee 3800X is already maxed out, while the 3700X boosts to a higher clock (relative to the 3800X). But the max clocks should be pretty similar between the two since that's the way AMD's boost is working. There maybe 1-3% improvement with 3800X. Hard to say anything for sure until we see the proper tests. For all intents and purposes check out the 3700X benchmarks that are out already, 3800X will pretty much be the exact same thing. If you are feeling optimistic, add 2%.