http://www.fudzilla.com/home/item/36284-20nm-node-broken-for-gpus
If you didn't believe me, Alatar and a few others, perhaps now you will.
Well there you go. A website says it.
If you didn't believe me, Alatar and a few others, perhaps now you will.
both companies spent a lot of time looking into the new 20nm manufacturing process and they have decided that it is simply not viable for GPUs.
Yields are not where they are supposed to be and from a business perspective it doesn’t make sense to design and produce chips that would end up with very low yields. At this point we do not expect to see any high-end chips in 20nm, as there are obvious manufacturing obstacles
To put things in perspective, in a single 20nm 300mm wafer you can place more than 700 A8 dies, while Nvidia can get about 140 Maxwell 204 chips from a 28nm High K 300 mm wafer and in 20nm manufacturing it would be able to get more, as the individual die would be significantly smaller.
However, these 150-250W chips are completely different than low-power SoCs with TDPs of less than 5W. They are worlds apart and one can assume that with the high performance and clock of discrete GPUs, coupled with their sheer size, result in higher leakage and other issues. Making a chip 4.5 times bigger means that there is much more room for potential issues, leakage and yield problems.
Well there you go. A website says it.