How do I get technical information on my video card? (Model, RAM, Mhz, etc)
Select Graphics/Displays from the output of system_profiler.

In a mac terminal, type:

system_profiler SPDisplaysDataType

The output will show something like this with your card name and details:

system_profiler SPDisplaysDataType

Graphics/Displays:

AMD FirePro D500:

  Chipset Model: AMD FirePro D500
  Type: GPU
  Bus: PCIe
  Slot: Slot-2
  PCIe Lane Width: x16
  VRAM (Total): 3072 MB
  Vendor: ATI (0x1002)
  Device ID: 0x679e
  Revision ID: 0x0000
  ROM Revision: 113-C3861J-687
  gMux Version: 4.0.11 [3.2.8]
  EFI Driver Version: 01.00.687
  Displays:
    CS230:
      Resolution: 1920 x 1080
      Pixel Depth: 32-Bit Color (ARGB8888)
      Display Serial Number: 27673034
      Main Display: Yes
      Mirror: Off
      Online: Yes
      Rotation: Supported
    CS230:
      Resolution: 1920 x 1080 @ 60Hz (1080p)
      Pixel Depth: 32-Bit Color (ARGB8888)
      Display Serial Number: 27712034
      Mirror: Off
      Online: Yes
      Rotation: Supported
      Television: Yes

AMD FirePro D500: