The output power of your power supply is too small, even less than 220W, only 218 W. If you want to use the 7750, the power supply must be changed, and the rated power of 350W is enough (it is destined to be rated power, not the maximum power).

Domestic power brands choose Hangjia, and Taiwan Province Province chooses Antaike.

As for the graphics card brand of 7750, you can choose Dylan Hengjin, Sapphire, Asus and MSI.