As there is no make or model I can't but the memory allocation is some amount of fixed and the rest is dynamic. There are thousands of web pages about Intel HD GMA video systems so I'll pause here to get more machine detail.
I just bought a new laptop and I want to make sure everything is working well. When I check the GPU through Windows Control Panel it only comes up with the Intel CPU integrated graphics instead of the NVIDIA GPU. If I run dxdiag my graphics card does show up under the "Render" tab. Is that all normal? I imagine this is just a way to save battery so the system switches to the Intel graphics when it doesn't need the GPU but I want to make sure. Also, is there a way to check the dedicated memory for the graphics card? In the dxdiag window it just shows the entire system RAM for GPU memory.