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Old 05-03-11, 11:11 AM   #10
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Default Re: nVidia's 28nm Kepler expected to hit stores in late 2011?

Originally Posted by TheANIMAL View Post
Hold on...

40 divided by 28 is 1.42857....

1.42857... squared is 2.0408... so you can get a double the number of transistors in the same space moving from 40 to 28nm. That's just over 6.4 billion transistors unless my maths is completely off.

The reduction has to be squared to make it work for a square chip doesn't it?

There's a 30% reduction in size going from 40nm to 28nm, but since we have to consider that both transistor lenght and the overall their diameter get affected with the change in fabrication process, that increases to 60% basically....

If the calculations for the transistors are made for all 3 dimensions( lenght, height and how wide they are), then the 30% reduction applies in all 3 dimensions, and the overall transistor count can increase by 90% and as you said, nearly double the transistor budget for the same die size compared to 40nm.....

It really comes down to the overall shape of the transistor and overall layout, and logic to cache ratios and power consumption and thermals, but it's easy to see that it'll allow a transistor budget increase that's significant to say the least, and will allow to enhance the GPU in many aspects over fermi, that much is sure....
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