i think you forget one thing AMD currently taking approach to open up their architecture for third party. so maybe (although its unlikely) they will licensing several AMD patented CPU technology to nvdia ??? like 3Dnow etc.
Its not a matter of forgetting, it is a matter of it not being relevant or applicable. 3DNow! went nowhere even in the x86 based ISA for which it was intended, it certainly isn't suddenly going to make ARM all the more a contender of x86 today just because they include it.
Consider this, the best that AMD has to offer ARM is already included in its current Bulldozer, Llano, and Bobcat products. Which of those competes well with Intel?
Now consider the IC design pipeline and timeline. It is about 4yrs long.
So what is ARM (or Nvidia) going to take from AMD today in their designs for an ARM chip that won't be produced for 4yrs but is still going to be competitive against what Intel is going to be selling in 4yrs?
This is not as easy as stating (1) and then waiting for (3):
(1) I challenge you to make a "big" ARM core
(2) Somebody go figure out what that means and how to do it
(3) Profit
That step (2) is the whole reason it hasn't been done already, and until the problems with step (2) are circumvented there is going to continue to be too little reward and too much risk for any company to pursue it.
3GHz ARM is not difficult to build. But the IPC would suck so bad it would not be a product that anyone would want to buy. That would be like making a 3GHz 486 cpu, the stalls in the pipeline would be massive in clock counts, making the performance not all the good but power usage would be high.btw is 3Ghz ARM really difficult to build ?????maybe with just increasing tegra frequencies, and without expanding the ISA, nvdia could in theory make high performance ARM based CPU ???
To make a 3GHz ARM chip that maintained decent performance would require all the cache tricks, branch predictors, memory bandwidth, etc that modern day multi-GHz x86 CPU's have. The ROI is just no there to try and design that from the ground up.
Again it took AMD and Intel 20yrs to get to where they are today, you can't really expect ARM and Nvidia to make that transition in 4yrs. There is a huge gulf in technical capabilities.
If AMD thought it was doable then they would have done it instead of designing Brazos/Bobcat from the ground up. Same with Intel and Atom. The very people who know exactly how challenging it is to do this stuff in reality looked at it and concluded they were better off doing ground-up new designs with x86 rather than ARM.
That should tell you a lot. Combine that with the fact there are no "big" ARM chips out there and now you have the benefit of using both the logic of deduction and the logic of induction to close in on the answer from above and below.
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