I can't find any HP Pavilion 550-221 with an AMD A8 8650. I have found HP Pavilion with A8 8650, but it's model 550-130ns (in Spanish: https://support.hp.com/us-en/document/c04888656/), the mobo is named "Orchid3" and the CPU compatibility list is limited to:
AMD A10 8850 (Godavari) 3,9 GHz 4 cores, 95 W, Radeon R7
AMD A10 8750 (Godavari) 3,6 GHz 4 cores, 65 W (cTDP - 45 W), Radeon R7
AMD A8-8650 (Godavari) 3,2 GHz 4 cores, 65 W (cTDP - 45 W), Radeon R7
AMD A6-8550 (Godavari) 3,7 GHz 2 cores, 65 W (cTDP - 45 W), Radeon R5
AMD A10-7800 (Kaveri) 3,5 GHz 4 cores, 65 W (cTDP - 45 W), Radeon R7
AMD A8-7600 (Kaveri) 3,1 GHz 4 cores, 65 W (cTDP - 45 W), Radeon R7
AMD A4-7300 (Kaveri) 3,8 GHz 2 cores, 65 W (cTDP - 45 W), Radeon HD 8470D