According to the latest news it seems that NVIDIA could launch NVIDIA GeForce GTX 980 in Mini-ITX format, something that AMD has already done with its top-end graphics while only mid-range or GeForce GTX 970 from NVIDIA camp are in this mini-ITX format.
Thus we have the same silicon Maxwell (GM204), with 2048 CUDA Cores, 128 TMUs and 64 ROPs to a base and turbo frequency of 1126/1218 MHz coupled with 8GB of GDDR5 memory @ 7000 MHz with a memory interface of 256 bits, which in essence is the same GPU desktop unless move with a variable TDP between 125 and 150W (165W vs. desktop). The reason being operated at 150W peak is due to make use of the turbo frequency, the maximum frequency is lower than the desktop alone.
If we talk about performance, the new GPU is about 30 and 50 percent faster than the GeForce GTX 980M and very similar to a Radeon R9 Nano regarding a GPU desktop performance can be improved if we go for a good Cooling system with Overclocking allow tests marked a temperature of 87 ° C at full capacity, so the range is limited. Tests under Overclocking gives us additional performance improvement by 10-15% with the GPU to 1400 MHz and memory at 7.50 GHz, making it perform like the desktop model.