Ratisbona

Not even close. I did that experiment a few weeks ago on my 3900X. I downclocked it to about 3700-3800MHz fixed and undervolted it to 0.975V or something like that, to make it draw as close as I could get it to 65 W. And it still got over 2800 points in Cinebench. And from what I read about the 3950X, these chips are very much better binned that the 3900x again, so they should perform even better.

I got a WU of project 14271 today, and it's producing about 1.500.000 PPD (Points per day) on my Vega. I've never seen points that high with any other work unit before, that's what I meant.

https://foldingathome.org/faqs/fah-v7/v7-introduction/web-control/what-is-prcg/WHAT IS PRCG? This is an abbreviation corresponding to four numbers which identifies and distinguishes each Work Unit. The first number specifies the Project, which is the protein under study. A single project number is made up of thousands of individual Work Units. The remaining three numbers identify the specific part of the project that has been assigned exclusively to you. Work is rarely duplicated (except when a computer fails to complete an assignment in a timely manner) so every set of PRCG numbers is unique and only assigned to one person. Technical details of the PRCG numbers and how Work Units relate to each other are covered under the more advanced Simulation FAQ.

Speaking of good Workunits for AMD: I got a 14271 for the first time today, seems pretty OP for my underclocked and undervolted Vega 64

Yes, I've been getting only these 14196s for about two days now, I'm getting about 905k ppd on my Vega 64, while on the best WUs I hit 1.3M ppd. However still better than thed ~300k ppd I got with really bad WUs before so i'm not complaining, at least it's consistent

This ist how I'm running my Vega64 (Sapphire Nitro+): +Memory on Stock Settings (950MHz). For gaming I'm clocking it a good bit higher esp. the HBM, but for folding this seems really good and I'm getting about 1,2-1,3 Mio. PPD (in good WUs...) at only about 140-150W and under 65°C:

One of Germany's biggest electronics retailers (mindfactory.de) apparently just ogt a bigger shipment of these in, it's been available at mindfactory.de @retail since at least yesterday, that's longer that I've seen it stay available since launchday The sold units there went up from ~2800 at the beginning of last week to ~3500 right now as well. So shipments of these do come in.

I don't use it primarily for gaming, my focus for it is on Videoencoding with Handbrake, so I'm running an all-core 4.2 GHz @ 1,225V which gives me a nice and stable around 75° on heavy all-core-loads. I just tested the stock behaviour for half an hour to see if it did anything, as I had never seen the advertised 4.6GHz reached on it before. By coincidence I had tested this same CPU a few days earlier on a X470 Taichi Ultimate Board which did boost the fastest core in Cinebench giving me a 205 points single core score, vs. 195 on my usual x570 ABBA-Board when boosting the "wrong" core. So it's a "measurable" performance-loss at the moment if that's consistent, but for gaming or any real world usage I doubt you'll notice it much.

I've noticed the same behaviour with the ABBA-Agesa on my 3900x. It boost the fastest cores to 4.600 MHz or above (on idle mostly), but runs Cinebench on the slower CCD at about 4,3-4,4 GHz on stock BIOS. I don't care too much about it though, as i'm running an all-core overclock as well. This has been noticed by more tech-outlets as well, I think Tomshardware mentioned it, so it'll probably be adressed in the next update.

Yes they should light up with the default Rainbow-effect. Maybe try reseating them in the slots?

The best place to one initially in Europe was AMDs Onlineshop directly, they had stock in the first 2 weeks or so after release, but has since sold out. Mid-July the big german e-tailers (Mindfactory, Alternate,..) got some initial stock that sold nearly instantly with preorders. Since then they seem to get a few on a regular basis but that probably covers only the outstanding orders so "in-stock"-Stocks never seems to appear. But if you were to "join the queue" at one of these stores I'd feel confident to get one in 1-2 weeks.

I have a bit of a wierd case as my 3900X seems to be quite a good chip, clocking 4.2 GHz at only 1.225V stable in prime without AVX, but at the same time having terrible thermals, preventing me to go any higher for longterm use. I'm certain at this point that the solder on at least to of the cores isn't great, so I'm getting quite extreme hotspots on at least two of the cores. In general I'm getting temps about 10°C too high (both with Thermal Grizzly Kryonaut and Carbonaut, so it's not the paste application at fault). But as 4.2GHz is "fast enough" for gaming (limited by GPU anyway) and better than stock for all-core-loads, I'm happy with this for the moment.

You should consider the RX 5700 over a RTX 2060. Much better performance for the price.

Changing the thermal paste CAN make the difference. If it's dryed up and cracking, that can lead to temps like you're observing. No guarantees though , but it's the first thing I would check and change.

If you want to go as cheap as possible I'd try first to keep the current motherboard and RAM. With themost current BIOS this does support the 3700X and with the much improved memory controller of 3rd Gen Ryzen your RAM will most likely work just fine as well. First gen Ryzen was notoriously picky with RAM so no surprise that you could not get it to run 3200 MT/s but that's much better now. For cooling I can recommend something like the bequiet Dark Rock 4, at least here that a good bit cheaper that the Noctuas and cools my 3900X just fine so won't have trouble with the 3700X either