ManagementScope sc=new ManagementScope(@"\\.\root\cimv2", null); 
ManagementPath  ph=new ManagementPath(@"Win32_VideoController");
ManagementClass mc=new ManagementClass(sc, ph, null);
            
foreach(ManagementObject ss in mc.GetInstances())
{
  Console.WriteLine("Name: {0}", ss.GetPropertyValue("Name"));
  Console.WriteLine(" Processor  {0}", ss.GetPropertyValue("VideoProcessor"));
  Console.WriteLine(" VideoRAM   {0}", ss.GetPropertyValue("AdapterRAM"));
  Console.WriteLine(" Resolution {0}", ss.GetPropertyValue("VideoModeDescription"));
  Console.WriteLine(" Refresh    {0}", ss.GetPropertyValue("CurrentRefreshRate"));
}