Upper bound for the number of representation numbers as the sum of two primes

Question

To prove strong goldbach conjecture one can use a lower bound of number of the representations of a number as the sum of two primes. If its greater than zero, than we have conjecture.

I wonder if there is an upper bound of this number of the representations for a number $x$?

Edit: I have edited the question to tell the question in my head properly. I apologize for the people who answered this question.

Answer 1

An obvious upper bound is $\pi(n/2)$.

EDIT: See OEIS sequence A002375 and references there, in particular the first entry in the FORMULA section.

Answer 2

By a result of Helfgott, every even number $n ≥ 4$ is the sum of at most four primes. This seems to be currently the best known result in this direction.

See the wiki page on the Goldbach's conjecture (in particular the section Rigorous results) and the references contained therein.