It has a Bronze rating. Really it's up to how clean you want your power to be.
With 80 Plus Bronze @ 230V and 50% load on the PSU, you're looking at 85% efficiency, whereas with the 80 Plus Gold @230V and 50% load, you're looking at 92% efficiency.
Personally I'd always recommend spending the extra money and getting the cleaner power. However, that's up to you
