Modern computer system design and architecture lecture notes, whiteboard, professor, middle-aged man, glasses, beard, brown hair, worn jeans, casual wear, standing, gesturing, pointing, explaining, complex diagrams, circuit boards, wires, chips, motherboards, CPU, RAM, GPU, storage devices, network routers, switches, hubs, lectures hall, university setting, natural light, soft shadows, shallow depth of field, realistic texture, ambient noise, warm color tone.