Broken Aorus GTX 1080ti. Seeking help with missing component

[vazza10]

hi, i have a gigabyte gtx 1080ti extreme which i need help finding out what component is in this position. it ripped off when i took the back plate off but wasnt just ripped off it totally shattered so i cant read the markings on it. from what i can gather its some sort of mosfet or gate of some sort as its markings is U. U551 is the component.

 

thanks