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Stephan, thank you for that information.
Let's take the Intel® Xeon® Processor E3-1245 v5 (8M Cache, 3.50 GHz) Product Specifications as an example. The 1.7 GB corresponds to the Graphics Video Max Memory the maximum amount of memory accessible to processor graphics. In other words, it indicates that the VRAM cannot go above this limit.
I would like to share with you the following conversation that happened on the Intel® Software Development Products › OpenCL* Forums; https://software.intel.com/en-us/forums/opencl/topic/559285. It basically explains that there is an there is a bug in the documentation on ARK where the "Graphics Video Max Memory" field is populated without stating the limits’ contexts.
The processors you mentioned have the correct Graphics Video Max Memory populated.