Nvidia has serious yield problems with the GT200.

[savantu]

Any way you can calculate RV770? Bravo btw, very nice job. I took some wafer classes back in the day but never on defect distribution

http://www.icknowledge.com/misc_tech...calculator.xls

It is an Excel model ; insert chip dimensions , wafer size and calculate for 0.25 and 0.5dd.

It's easy.

Gross die 237

0,25dd/cm^2
Exponential 144 good dies , yield 61%
Murphy 129, yield 54,6%
Poisson 124 , yield 52,7%
Average ( best+worst/2 ) 134 yield 56,5%

0,5dd/cm^2
Exponential 103 , yield 44%
Murphy 75 , yield 31,8%
Poisson 65 , yield 27,8%
Average 84 yield 35,44%

Again , I consider 0,5dd more representative.Based on that , ATI gets 7-8x the number of high end chips per wafer vs. NVIDIA.