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Well, here's something I never knew yet or paid attention to : PCIe is full duplex (from what I think I'm seeing on wikipedia)
So, PCIe 8x should be great for the CPU sending commands, vertices, texture data etc. while video output travels the other way, without hurting much.
Thunderbolt is full duplex too, it must be why an external GPU with display on the internal laptop monitor is usable at all (on e.g. the infamous macbook pro).
There's still a performance penalty doing that but Thunderbolt is only PCIe 4x 3.0 i.e. half the bandwith in the Ryzen APU scenario.
The question is, why would you use a Ryzen 2400G which is not a really great CPU with an nvidia GPU. It's far from bad yet, perhaps like an old i7 2600K (old in terms of years not performance obviously)
I wonder if Zen 2 brings PCIe 4.0 to the AM4 socket. I think it definitely should, you'll get PCIe 3.0 in an old motherboard and PCIe 4.0 in a new motherboard.
Ryzen 2400G, 2200G and the new Athlon are like the Ryzen 1000 series on performance (but with the finer monitoring/power management of Ryzen 2000 series, but with half the L3), so a Zen 2 APU (Ryzen 3000 series) has significant performance to gain. Thus a next-gen Ryzen APU + Nvidia GPU rig would be a rather weird thing to do but not completely nuts.
So, PCIe 8x should be great for the CPU sending commands, vertices, texture data etc. while video output travels the other way, without hurting much.
Thunderbolt is full duplex too, it must be why an external GPU with display on the internal laptop monitor is usable at all (on e.g. the infamous macbook pro).
There's still a performance penalty doing that but Thunderbolt is only PCIe 4x 3.0 i.e. half the bandwith in the Ryzen APU scenario.
The question is, why would you use a Ryzen 2400G which is not a really great CPU with an nvidia GPU. It's far from bad yet, perhaps like an old i7 2600K (old in terms of years not performance obviously)
I wonder if Zen 2 brings PCIe 4.0 to the AM4 socket. I think it definitely should, you'll get PCIe 3.0 in an old motherboard and PCIe 4.0 in a new motherboard.
Ryzen 2400G, 2200G and the new Athlon are like the Ryzen 1000 series on performance (but with the finer monitoring/power management of Ryzen 2000 series, but with half the L3), so a Zen 2 APU (Ryzen 3000 series) has significant performance to gain. Thus a next-gen Ryzen APU + Nvidia GPU rig would be a rather weird thing to do but not completely nuts.
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