8GB are 8GB, it doesn’t matter how fast they are. It should be illegal selling a computer that’s impossible to upgrade with so little RAM that it won’t be able to hold more than half a dozen browser tabs in 3 years time, seeing how fast web apps are ballooning in requirements and how more and more desktop apps are turning into websites inside a wrapper that take 4x the resources of a native app. The actual price of these things is twice the “starting from” if you don’t want to end up stuck with literal e-waste in a record time.
If these do indeed exist and are any good, there’s a very good chance that the AM4 X3D family becomes the Sandy Bridge of this generation for gaming, giving you a ridiculously long run in that regard for pretty much a budget price since decent B550 boards cost like a third of a B650.