It is not worth to buy at all!
This PSU cannot even keep within ATX specs. It will cause you problems. Do not cheap on a PSU. https://www.hardwareinsights.com/zalman-zm600-lx-power-supply-review/7/
I suggest the EVGA b3. It is a very good unit, for an affordable price. Otherwise the Corsair CX450m is a good option.
Also, never choose purely by brand, as that tells basically nothing about the specific psu's quality and performance.