Pemalite said:
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A very long time ago consoles where pretty different and relied on custom chips>not as versatile as PC hardware back then but could achieve things a PC couldn't or only a ten times more expensive PC could.
With PC-HW getting more and more features like 2D acceleration, 3D acceleration, more and more capabilities like HW-T&L, shaders... that slowly vanished, though fast hardware stayed expensive.
About consoles price and power:
360 and PS3 where massively subsidized, one reason of the long time losses MS and Sony made. Ad the RoD to that, cost tons of money again.
More power also means more heat and energy consumption, likely a bigger console and/or louder fan.
Let's look at the PS4, it's smaller, more powerful at least GPU-wise so:
2x GPU power would roughly mean 2x the power consumption if you're going for shaderunits. If you're going for clock speed it's even worse. Then you need a more powerful CPU to actually feed that GPU and because putting more and more cores into a CPU doesn't make that much sense it possibly would be about clock speed at least to some degree.
So our console gets way more energy hungry>cooling gets bigger/more expensive and possibly louder, console gets bigger.
More die space for the APU needed>higher price per APU
Lower yield because of more failures per APU> higher price again
You need more memory bandwidth> wider bus and more expensive mainboard.
In the end two times the power might make manufacturing more than two times expensive.