After Effects reports only 2GB of RAM for Mac Pro AMD D700 GPU

Question

Using After Effects CC 12.2 on Mac Pro 2013.
When I go to After Effects>Preferences>Previews>GPU Information the app reports that my system has an AMD D700 GPU for OpenGL.  This is fine, however, it also states that the Total Memory is 2.00 GB, which is well below the 6GB of VRAM the GPU is supposed to have.  Any ideas why this is happening?

Answer 1

I found an interesting post about enabling the GPU in CS6, the GPU Sniffer application embedded within Adobe Premiere CC reports the new Mac Pro video cards as:
--- OpenGL Info ---
Vendor: ATI Technologies Inc.
Renderer: AMD Radeon HD - FirePro D700 OpenGL Engine
OpenGL Version: 2.1 ATI-1.20.11
GLSL Version: 1.20
Monitors: 2
Monitor 0 properties -
   Size: (0, 0, 2560, 1440)
   Max texture size: 16384
   Supports non-power of two: 1
   Shaders 444: 1
   Shaders 422: 1
   Shaders 420: 1
Monitor 1 properties -
   Size: (2560, 0, 2560, 1440)
   Max texture size: 16384
   Supports non-power of two: 1
   Shaders 444: 1
   Shaders 422: 1
   Shaders 420: 1
--- GPU Computation Info ---
Found 2 devices supporting GPU computation.
OpenCL Device 0 -
   Name: AMD Radeon HD - FirePro D700 Compute Engine
   Vendor: AMD (Apple platform)
   Capability: 1.2
   Driver: 1.2
   Total Video Memory: 6144MB
OpenCL Device 1 -
   Name: AMD Radeon HD - FirePro D700 Compute Engine
   Vendor: AMD (Apple platform)
   Capability: 1.2
   Driver: 1.2
   Total Video Memory: 6144MB
Running the same GPU Sniffer application embedded in After Effects CC reports the video card specifications as:
Texture memory: 2047
Vendor string:    ATI Technologies Inc.
Renderer string:  AMD Radeon HD - FirePro D700 OpenGL Engine
Version string:   2.1 ATI-1.20.11
OpenGL Version:   2.1
Has NPOT support: TRUE
Has Framebuffer Object Extension support: TRUE
Has Shading Language support: TRUE
Started compilation of GLSL shaders
Successfully finished compilation of GLSL shaders
Ignoring SM4.0 check for cards on mac
Return code: 3
Is it a problem with the GPU Sniffer application?