My desktop has an onboard Radeon Graphics and a discrete Nvida Grapics card. the onboard grapics has been disabled, but I can only use 6 out of 8 GB memory for the OS, as 2 GB has been allocated (i think) to the shared video memory (Not used). the Nvida adapter has 4 GB dedicated memory.
The amount of reserved graphic memory may be selected in the system BIOS. Depending upon discrete graphics type and CPU brand there are default minimum values allowed within the drop down table menu. I have mine set to 32Mb.
Connected to HP Support, and after a some discussion on how this could be an expected situation that 2 GB was used for hardware. I found a tread on this forum, that outlines an issue with AMD CPUs having onboard GPU will claim memory even though disabled.
So this is a product problem, that needs HP to solve most likely by a BIOS update
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