Well from the noise surrounding the system, I would say that the CPU seems to have more in common with the PPC 47x lines than with the Power A2.I thought I had linked to this article, with an identical section on Bluegene Q.
http://en.wikipedia.org/wiki/PowerPC_A2
Well A2 is only a core afterall, and two processors use it. PowerEN (made for high traffic networking and combining router/web frontend loads) and Bluegene/Q.
The first one debuted in early 2010.
I take your word that you get better latency hiding with the four way SMT and stuff. I didn't necessarily disagree with you about the high latency.
Just it seems to me Wii U CPU maybe is closer to A2 than Broadway, at least utilizing a lot of its tech (cache hierarchy is significant stuff) even though it may be some kind of a stop-gap chip, and yes retrofitting what looks like 3Dnow! to a modern design is probably not a big deal. Gecko/Broadway itself was adding a SIMD to an existing design.
In all the power A2 implementation I am aware of the L2 is shared among the cores as in Xenon.
Expresso has 2MB for one cores, and 2x 512KB if rumors are correct.
The power A2 is IO, the ppc 47x is OoO. Single thread performance for a power a2 clocked at the same speed as Expresso would be dreadful. Imagine a Xenon running at ~1/3 the clock speed and remember the comment about about the celeron in the xbox @700MHz offered better single thread performances than Xenon.
The power A2 has wide SIMD and can do 8 DP FLOPS per cycle ( I wonder if it can do 16 SP FLOPS per cycle though?). PPC 47x and rumors about an enhanced broadway got a paired FPU.
I don't think they have anything in common or I missed some leaks at some point.
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By the way I'm completely disappointed with what seems to be the clock speed Nintendo choose if rumors are are right, 1.2GHz, really? I mean even a PPC 47x at full speed (or IBM recommended speed ie 1.6 GHz) was too enthusiastic, I'm close to being bitter...
And then they are championing are good their cooling system is and all the efforts they made, when games pulls 33Watts... at the plug! That is a bad joke, my laptop embark both a A8-3850M and a redwood+gddr5 and it is luckily flatter than the WiiU, I haven't heard HP or any other laptop manufacturers by the way championing the fact that they can fit a x< 30 Watts chip in a tiny enclosure, not exactly an achievement.
That was hilarious, thanks. good spiritSo I'm curious, when exactly does the design become too old to use? Not in 2006, but in 2012? If you're going to tell me Broadway is too old then I'm going to counter with BlueGene/Q being too new; a chip that debuted in 2012 being used as the CPU in a 2012 Nintendo console is reality bending. This is the company that used ARM11s in their 2011 handheld.
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