Is colorful c.n6 1g compatible with amd7750?

Yes, but the default frequency of 7750 is a little high, and the heat dissipation capacity of c.n6 1g is a little insufficient.

It is recommended to buy a CPU fan instead of the original one.

Overclocked three Red Sea HP-928 ￥80

This stable operation is absolutely no problem.

It is ok to brush BIOS, but it is more troublesome. 7750 is not recommended.