I have noticed that companies don't sell SoCs very often outside of low tier hardware like a Raspberry Pi or those Intel Atom SoCs, I haven't seen one with a higher tier APU design. I think the only higher end SoC I seen sold is the NVidia Jetson TK1 (and TX1 I just found out) kit.
I was going to do a "Surface Pro-busting" project myself with a high-tier x86 SoC such as a AMD RX-421BD or better yet, when a Zen SoC comes to play, was hoping to avoid buying a large mother board (even mini-ITX would be large for this) for an APU that might consume too much power and dissipate too much heat.
Ultrabook motherboards are pretty small. Might be a bit too wide tho. Might also only give similar performance to what you are trying to beat.
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The a12 9700P is BGA (fp4) the same SOC as the rx-421, big difference is most of the NB and SB are also on the chip I think.
Kid's Lenova I got her has one in it.
I have no idea if this helps or in any way relates to what your thinking of but I hope it does:)
The a12 is 15watt compared to 35 which would help the heat problem, plus some new feature that will downclock if there is too much heat on the users lap.
Yeah, I might try one of those, yeah, it might be too wide though unless I intend on making a 16:9 aspect ratio, which for a tablet is not ideal.
This sounds like a start, on the other hand I might be better off waiting until a Zen APU makes it's way so I can have that IPC that rivals Intel, plus more GPU performance.
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