What should concern you is whether you have dual-channel RAM. Loads running on the Integrated Graphics, such as render, do take a portion of RAM for use as VRAM, but this is not something that should be of much concern in terms of utilization. RAM usage depends on what a particular program does with it, and whether your computer is experiencing any form of anomaly such as memory leaks due to poorly written device drivers. However, when in use, the discrete GPU will obviously consume more power and generate more heat. Offloading programs to the NVIDIA GPU will markedly improve their performance, say games and rendering software such as the Adobe line of products.In such cases, you can either have outputs wired to either the Integrated Graphics ONLY OR wired to the discrete GPU, with the eDP -driven panel for the laptop being the only monitor powered by the Integrated GPU. On some models, it's even possible to completely disable Optimus alltogether in the system BIOS and select a specific GPU (common on workstation grade systems such as HP's Zbook series), where others do not allow adjusting Optimus setups from the BIOS. Every OEM is free to configure Nvidia Optimus the way they see fit.
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