Without being brutal, if you can return it for refund, do. Forget about the modular bit, unless its strapped on to a real ENP-7660B or FX600 (enhance/silverstone, same thing).
I recognise the the layout for that PSU and it corresponds to one that at best will do maybe 550W continous, peak 600W max load on 12v rail 39A continous peak 45A, efficiency around 82% MTBF 20-30k hrs depending on ambient temp.
I was going to pull one in as a sample to see if it had any merit, but when push comes to shove the mfg has gone silent after being asked to provide a full test report to back up a certificate for a particular compliance (in my experiance, its because one doesn't usually exisit). Worth noting that they approached me initially and have since gone deadly silent.
Have a scroll down aliexpress against a similar search and you may spot a similar layout psu with white 4 pin connector instead of blue ;-)
Ohh and to the poster earlier with the slightly more cloned enp-7660b design. yes it maybe a bit much having all that on a 20pin connector, probably be fine, for reference though Seasonic ssp-300sug (300W) uses just 1 connector, but its 26pin for all connections rather than 20pin, but I'd be happy to adjust that loom to add a PCI-E connector into the mix.