It's looking increasingly unlikely that either AMD or Nvidia will be able to release a new graphics card this year with a die manufactured using a 20nm process. Issues are aplenty at TSMC, the foundry that produces both AMD and Nvidia GPUs, with the company struggling to meet production demands and repeatedly delaying their final 20nm technology.

Nvidia were originally hoping to release high-end 'Maxwell'-based cards manufactured on a 20nm process this year, but TSMC hasn't been able to meet their end of the bargain.

Meanwhile over at AMD, senior vice president Lisa Su has stated that the company will continue to use the 28nm process for the remainder of 2014, before moving to 20nm and FinFET sometime down the track. This will likely mean that Pirate Islands, the successor to AMD's current products, will feature 28nm GPUs.

http://www.techspot.com/news/56481-20nm-gpus-unlikely-in-2014-due-to-tsmc-issues.html