NVIDIA is reportedly preparing faster mobile GPUs based on Maxwell, with a GTX 980MX and 970MX on the way.

The new GTX 980MX would sit between the GTX 980M and the laptop version of the full GTX 980, with 1664 CUDA cores (compared to 1536 with the 980M), 104 Texture Units (up from the 980M's 96), a 1048 MHz core clock, and up to 8 GB of GDDR5. Memory speed and bandwidth will reportedly be identical to the GTX 980M at 5000 MHz and 160 GB/s respectively, with both GPUs using a 256-bit memory bus.

The GTX 970MX represents a similar upgrade over the existing GTX 970M, with CUDA Core count increased from 1280 to 1408, Texture Units up from 80 to 88, and 8 additional raster devices available (56 vs. 48). Both the 970M and 970MX use 192-bit GDDR5 clocked at 5000 MHz, and available with the same 3 GB or 6 GB of frame buffer.

WCCFtech prepared a chart to demonstrate the differences between NVIDIA's mobile offerings:

Model GeForce GTX 980 Laptop Version GeForce GTX 980MX

GeForce GTX 980M

GeForce GTX 970MX GeForce GTX 970M GeForce GTX 965M

GeForce GTX 960M

Architecture

Maxwell Maxwell Maxwell Maxwell Maxwell Maxwell Maxwell
GPU GM204 GM204 GM204 GM204 GM204 GM204 GM107
CUDA Cores 2048 1664 1536 1408 1280 1024 640
Texture Units 128 104 96 88 80 64 40
Raster Devices 64 64 64 56 48 32 16
Clock Speed 1218 MHz 1048 MHz 1038 MHz 941 MHz 924 MHz 950 MHz 1097 MHz
Memory Bus 256-bit 256-bit 256-bit 192-bit 192-bit 128-bit 128-bit
Frame Buffer 8 GB GDDR5 8/4 GB GDDR5 8/4 GB GDDR5 6/3 GB GDDR5 6/3 GB GDDR5 4 GB GDDR5 4 GB GDDR5
Memory Frequency 7008 MHz 5000 MHz 5000 MHz 5000 MHz 5000 MHz 5000 MHz 5000 MHz
Memory Bandwidth 224 GB/s 160 GB/s 160 GB/s 120 GB/s 120 GB/s 80 GB/s 80 GB/s
TDP ~150W 125W 125W 100W 100W 90W 75W

These new GPUs will reportedly be based on the same Maxwell GM204 core, and TDPs are apparently unchanged at 125W for the GTX 980MX, and 100W for the 970MX.

We will await any official announcement.