Revision as of 22:31, 16 December 2017

Die sizes

Hello Dahaka88, You've recently added a number of die dimensions to a number of microarchitectures such as Zen, Skylake, and Coffee Lake. In an effort to ensure accuracy on WikiChip, I'm wondering where did those dimensions come from? Thanks --David (talk) 19:56, 15 December 2017 (EST)

The die dimensions are estimated through knowing die size (Xmm2) and physical die height and width relative each other, I will give you "Zen-Ryzen" die example;

Ryzen Die Size 213mm2 which is AMD's number, so I assumed it is correct, then I took the picture of die from the wikichip, :https://en.wikichip.org/w/images/thumb/3/3f/amd_zen_octa-core_die_shot.png/950px-amd_zen_octa-core_die_shot.png

and actual die shot after the delid of the Ryzen CPU,

https://farm5.static.flickr.com/4353/35620962953_8a12c79f69_b.jpg

https://www.overclockingmadeinfrance.com/wp-content/uploads/2017/09/RyZen-Die-Shot-3.jpg

and I measured the width and height by pixels, (2nd picture 1024x448 pixels flickr one),

1024/448 = 2,2857~ so wide side is "2,2857a" narrow side is "1a"

so mathematical equal of 213mm2 is 2,2857a X 1a = 213, 213/2,2857 = a x a = 93,188~ so a = 9,6534~ then multiply a with 2,2857 and 1 for getting dimensions

~22,06 x 9,65 = 212.9 the dimensions I got, of course actual dimension require direct measurement, but mathematically this is pretty close "estimated" die size dimension, :also thats why I used "~" symbol to mention that. I hope that helps how I did this estimated die sizes.