http://www.tweaktown.com/news/40305/nvidia-geforce-gtx-980-ti-or-gtx-titan-x-gm200-teased/index.html
NVIDIA has impressed the world with the launch of its second generation Maxwell-based GPUs, the GeForce GTX 970 and GTX 980. The cards sip power compared to their already power conservative predecessors, but introduce a slew of new technologies, features and best of all: a great price point. Where to from here? GM200, that's where.
GM200 is now being teased, which is going to be the big new GPU from NVIDIA. NVIDIA's GM200 will feature a die size of 551mm^2, 20-22 SMMs, 2560-2816 CUDA cores, a 384-bit memory bus, a performance boost of around 50% over the GTX Titan Black Edition, with it launching sometime before the end of the year. What it'll arrive as, in terms of naming, is a mystery. With the power efficiency of the GM204 core, which powers the GTX 970 and GTX 980, we should expect a dual-GPU card offered as the GeForce GTX 990, so that's one name it won't use.