Both AMD and Intel have introduced CPUs and motherboard chipsets which support the integration of a GPU into the same die as the CPU. AMD markets CPUs with integrated graphics under the trademark Accelerated Processing Unit (APU), while Intel markets similar technology under the Intel HD Graphics and Iris brands.Wikipedia
Modern Intel processors can have either Intel HD Graphics, Intel Iris integrated GPUs, or hybrid AMD Radeon Vega M graphics.
An integrated graphics processing unit (GPU) doesn't use its own RAM; it utilizes the system's memory instead. For modern Intel processors having integrated graphics, at any given time the GPU can access between 1 and 5 percent of the available memory. This percentage varies depending on the size of task, especially if you're multitasking or playing a game.
Unlike Intel HD Graphics GPUs, Iris integrated GPUs have a small amount of onboard memory to help speed them up.
Hybrid AMD Radeon Vega M graphics is connected to 4GB of second-generation High Bandwidth Memory (HBM2).
Some AMD Ryzen CPUs do not have integrated graphics. You need a discrete GPU for Ryzen CPUs that don't have a G suffix.
Best Answer
If you click on the gear icon (top right of your screen) then click on About this computer. The RAM is the 2nd entry down, below the computer name.
Edit
if you run
sudo lshw -class memoryin your terminal, this gives you the details of all available memory.