The APU from AMD they have is pretty much magic. You will not find anything comparable, any Ryzen APU you can actually buy is pretty much trash apart from very light-weight gaming. You absolutely need a separate GPU, and even low-end will set you back at least 250$. The only way to build something comparable for cheap would be to buy used.
The APU in the steam deck isn't anything too special (the 740M is comparable but is RDNA3). For the GabeCube they are using a customized 7600M, which previously has been used in many eGPUs for Chinese handhelds (at a very high price).
AMD does have some pretty powerful APUs right now, but I don't think we'll see it on many mass market
How customized it is, I guess we'll find out closer to release, but I am guessing just based on the dimensions that it is just customized specifically for the case, for space and cooling reasons.
A similar PC without the fit and finish with just consumer parts comes in at around $900.
Curious how much pull valve has with AMD to get this into people's hands.
