Netyaroze said:
If Sony makes a Slim they will only do it if they can build it cheaper then the previous model. Until the 20nm node is mature and cheap we wont see a Slim
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I agree with you. But TSMC has been producing 20nm chips since last year. The reason you aren't seeing it in GPUs yet is cause GPU manufacturers like nvidia has already vocally stated their displeasure with the die shrink. They say its useless to them and came too late but TSMC is ramping up for 14nm now too. There was already an article about a TSMC engineer saying something along the lines of getting the XB1 apu on a 20nm chip last year too. That's worth mentioning cause the XB1 chip is more complicated than the PS4's, so if they can do it for the XB1 they can do it for the PS4.
Going to 20nm this year wouldn't be a problem for them, especially since tsmc is already making 20nm chips for apple and Qualcomm. What remains to be seen is if so my would wait for the 14nm nodes before making a slim, but that's another 2 years away at best. As it stands, with 20nm APU and memory and an external power brick the can get the PS4 really really small. And when 14nm comes around, they can leave the slim as is and just build the PSU back into the box.
This is all speculation though, but 20nm chips are accessible.