recently i upgraded my gpu (gt 1030 to Sparkle arc a580 8gb) but the performance was not the estimated, for example, valorant got the almost same performance in gt 1030 and arc a580 (around 160-180fps), also my cpu since i start my pc goes from 30% usage to 100% usage peaks in basic things like loading discord or downloading something, it also happens in games, sometimes it goes from 40-50% usage to 100% usage, i tried an arc a380 6gb which is less demanding to my system but it keeps almost the same, the usage peaks happens but only in games, and the performance is almost the same as the gt 1030.
Specs:
CPU: Intel core i3 10100f
Motherboard: Asus B560M-A
16Gb Ram 3000Mhz
M.2 500gb
PSU: Evga 500W 80+ white