I know that better and better bounds of the Chebyshev Theta and Psi functions are implied by knowing that the first (insert large number here) zeta zeroes lie on the Critical Line. These bounds, specifically for $\theta(n)$, seem to approach the bound of $\theta(n) \leq n$ for all $n \in \mathbb{N}$.

- Is this bound known to be true or false? I haven't found anything specifically addressing the topic, so I should probably start here.
- Is this bound known to imply/be implied by the Riemann Hypothesis? Since they seem so interwoven it only seems logical that one would imply the other.