I'm in the market for a new system, a new PC, a new gaming machine. I won't run BOINC on it, that's done solely on the Android devices I have scattered around that are compatible. My present Intel i5-3470 with Radeon RX470 - 8GB and Windows 7 x64 is certainly not too old for many games, but there are games out there that require a 4th generation Intel iCPU and better videocards.

So, I have been looking around and building, virtually, my dream systems.
In AMD that'll be an
- Asus Prime X470-Pro socket AM4 motherboard
- AMD Ryzen 5 2600X CPU

In Intel that'll be an
- Asrock Z390 Taichi Ultimate motherboard
- Intel i5-9600K CPU

Both will further consist of:
- Cooler Master MasterLiquid ML360R RGB water cooling
- 32GB Corsair DDR4-2666, white
- Asrock Phantom Gaming X Radeon VII 16GB GPU
- Fractal Design Define R6 USB-C White TG Tower case
- Seasonic Focus Plus Gold 850W fully modular PSU
- 1x Adata XPG Gammix S11 Pro 1TB M.2 SSD
- 1x Seagate Barracuda 8TB HDD
- Windows 10 x64 Pro

The AMD system comes out at €2250,40
The Intel system comes out at €2470,40

So just €220,- between them.

Now to figure out which of the two to order... Advice?

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No crunch? Hum ...
IIRC temperature changes such as going full bore to idle and the reverse are the biggest cause of chip failure because the chip leads pull off the chip.
Maybe exclusive application might lead to less wild temperature swings.
Of course maybe the chip is built well and it won't matter ;-)

No clue on specs for game boxes, might ask on gamer forums or NC at Seti.

This may be obvious, but in theory you should be able to upgrade to Ryzen 3rd gen in the future. If you think you want an 8 core cpu in the future you can do so without upgrading anything else.

On the other hand, be sure the ram is compatible with Ryzen. The impression I get (I could be wrong) is that Intel is a little more forgiving.

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Been making a couple of small changes to the systems at hand and am now a bit flabbergasted as the price between the systems is now €100,-
That makes it difficult to choose.

AMD now has: Ryzen 2600X, ASRock X470 Master SLI -> €2,383.4
Intel no has: Intel i5-9600K, ASRock Z390 Phantom Gaming SLI -> €2,483.40

The rest on both is: Seasonic PRIME Ultra 850W Titanium, 850 Watt; Fractal Design Define R6 USB-C White TG tower; Seagate IronWolf, 8 TB HDD; ADATA XPG Gammix S11 Pro, 1 TB SSD; ASRock Phantom Gaming X Radeon VII 16GB; G.Skill 32 GB DDR4-3200 Kit; NZXT Kraken X62 AM4 ready water cooling; Windows 10 Pro.

I have decided to wait for Ryzen gen 3 to be released, and then get a new motherboard with PCIe 4.0 on it and the 7nm 12 core, 24 thread Ryzen 7 3700X.

Doing away with the VII and will add a Navi RX 5X00 card: https://www.anandtech.com/show/14412/amd-teases-first-navi-gpu-products-rx-5700-series-in-july-25-improved-perf

I have decided to wait for Ryzen gen 3 to be released, and then get a new motherboard with PCIe 4.0 on it and the 7nm 12 core, 24 thread Ryzen 7 3700X.

I think you mean the Ryzen 9 3900X?

No, at the time of posting that (look at the date) all we had to go on were possible CPUs and leaks. Only today has it come out that the 3700X is an 8 core, 16 threads CPU.

One of my (web)shops has the AMD Gen3 CPUs and motherboards put up with Dutch prices:
https://www.cdromland.nl/info/x570-moederborden
AMD 3600: https://www.cdromland.nl/product/261303
AMD 3600X: https://www.cdromland.nl/product/261302
AMD 3700X: https://www.cdromland.nl/product/261301
AMD 3800X: https://www.cdromland.nl/product/261300
AMD 3900X: https://www.cdromland.nl/product/261299 (and now all learn this is a Dodeca-Core :))

I'm checking the new price for a new system with a Navi 5700XT, the 3900X and an Asrock x570 Taichi motherboard: €2462,70
I may not need to pay (+€169,95) for my Windows 10, if I use one of my Windows 7 CD keys to register Win10 Pro.

Got 32GB of HyperX Fury DDR4-3200 and tomorrow I'll get a Samsung EVO 970 1TB NVMe M.2 SSD for an absolute steal.

Sounds like a nice setup! If you don't mind me asking, why the X570 board? The 5700XT won't use all that PCIe 4.0 bandwidth (at least, I don't think it would even for crunching), nor will the NVMe. Just curious, I'm not being critical.

Not sure I will go for the 5700XT, perhaps by the time I buy the main parts that the top range cards are available or over the horizon. So until then an X570 is future proofing.