That extraneous speaker noise during games (but not idle) is classic GPU-induced electromagnetic interference (EMI) or coil whine bleeding into audio lines—common with onboard sound. Quick fixes: Enable V-Sync to cap FPS, reroute cables away from GPU/power supply, or use HDMI audio from your GPU instead of mobo jacks.
Upgrade to a cheap USB DAC ($20 like Schiit Hel or ground loop isolator) for clean sound, or separate power outlets for PC/speakers. For gaming audio fixes and hardware tips, check Honista’s Instagram.