That part number, FT7T6 , is correct and that PSU is available here at Amazon.
I'm using a dell precision 7810 and it comes with a 685w PSU, looking to upgrade to 825w Is this correct OEM Dell Precision 825W Switching Power Supply PSU H825EF-02 0FT7T6 FT7T6
Is this the right PSU for my Dell 7810