I followed that link and read the wccftech article but there was no mention of adding an ARM processor to a Maxwell dGPU, that bit apparently came from some other source. I did enjoy reading the rest of the thread however.
Your bolded bit refers to Tegra, which is a mobile SOC, not a dGPU.
Actually, it's proof of concept and in fact Tesla is slated to get ARM:
http://www.tomshardware.com/news/nvidia-armv8-soc-gpu,18838.html Tesla is the same thing as GeForce but with different drivers and without DP being artificially crippled. It's not a leap to imagine that GeForce will also have ARM cores, if NV perceives a Mantle threat.. so that top to bottom, all NV dGPUs have ARM cores to deal with some or all of the issues that Mantle is supposed to address.
From the Tom's article:
"In an article posted by InfoWorld, the company's chief technology officer for the
Tesla product line, Steve Scott, was quoted saying, "Tegra is going to become GPU computing capable in the not-so-distant future. Sometime this decade we are
also going to start bringing integrated CPUs and GPUs together in the Tesla line". 'Sometime this decade' is not exactly clear, but we would take a guess that Nvidia is shooting for a release prior to 2015.
Scott was referring to ARMv8 processors, recently announced as
Cortex-A53 and A-57 models and a 2014 released date. However, Nvidia was not mentioned by ARM in a row of current ARMv8 licensees, which include AMD, Broadcom, Calxeda, HiSilicon, Samsung and STMicroelectronics. However, the emerging microserver market is an opportunity for a natural evolution of Nvidia's business. Combining Tesla with ARMv8 cores will allow the company to compete in a segment that will be crowded with industry heavyweights such as Samsung, Qualcomm, Texas Instruments - and Intel on the x86 side. Nvidia will also compete with its arch rival AMD in a new market.
The InfoWorld article pointed to Nvidia's Project Denver, which will be based on using the ARMv8 architecture in Nvidia products. According to ARM, the Cortex-A57 processor will be able to provide up to three times the performance of its current flagship, the 32-bit Cortex-A15 design."