Tegra systems use a unified memory controller for both GPU and CPU RAM. This means the GPU can access essentially all system memory as video memory and there is

Tegra systems use a unified memory controller for both GPU and CPU RAM. This means the GPU can access essentially all system memory as video memory and there is no meaningful distinction between the two. This has always been the case -- similarly, the Xavier Jetson, and the TX2 do not have split GPU/CPU RAM either. They all have unified controllers, so the "8GB of GPU RAM" for the TX2 you mention is also "8GB of CPU RAM". This thing essentially looks like a chopped down version of the TX1, considering the specs are all pretty much identical. These have 4GB of memory. Most of the time you'll be running a stripped down headless Linux 4 Tegra on this device, so something like 80% of your memory can otherwise be dedicated entirely to your application (both GPU and non-GPU compute portions) anyway.