btarunr Intel lacks 28 nm. There's 25 nm (NAND flash, IMFlash JV), and there's 22 nm (processors). Optical-shrinking Kepler to any of those will take another 4 months (sampling, testing, qualification, moar testing, mass production).

Besides, NVIDIA will not risk giving its designs to Intel (a GPU competitor, which could steal its designs for processor graphics).

AFAIK changing to another foundry also requires more testing and qualification. And Samsung's 28nm is gate-first, unlike TSMC's gate-last process, so that surely means a lot of work to change.If Nvidia is decided to change to another foundry, it means it's ready to loose a few months testing the new process and if that is the case, I'm sure they wouldn't mind spending a few extra weeks if that means making their GPUs on a much smaller and reliable process, such as Intel's 22nm.I don't think that's a real problem right now. First of all making the hardware is not the most difficult task for a company doing processors for 40 years, it's the drivers what really makes the difference between a CPU an a GPU. HD3000 and specially HD4000 are already a very decent piece of hardware for their size.Second and most important, Nvidia already shared their patents when they settled the lawsuit with Intel, so I don't think there's much more secrets to be found in the "silicon". IMHO any secrets/tricks that might be found on silicon (power reduction, lower latency, higher clock...) probably Intel knows better*.And in fact, Nvidia CEO already called Intel to start making ARM chips on contract. Newer Tegras will have Kepler GPU inside so they surely aren't very concerned about Intel stealing anything if they want Intel to make future Tegras for them.* BTW who's to say that a lot of the improvements in Kepler didn't come from the patents Intel shared as part of the deal? Even GPU Boost is similar to Turbo Boost, in the name too, where you might risk a lawsuit.