I have the same issue
ryzen 5600x
B550m aorus pro
Rx 6600 xt red devil
Ram Tridentz rgb 2x8gb 3200mhz
same issue, what on earth is going on. my apex only draw 32 watts with 1460mhz clock, then low fps and stuttering.
i suspect it happens after i swap my RTX 2060 super with RX 6600 xt, although...