Hardware Secrets has release an article on how to find the real manufacturer of your power supply. Most of us know that our power supplies aren't made by the company whose label is pasted on the side of it. So it is nice to know there is a way to find out who really makes these units. You may be surprised who makes that high-powered PSU you have supplying your rig.
"Everything will depend on the agreement between the two companies, as this agreement will say if the original manufacturer can or cannot sell their products to other companies or even sell them under their own brand. Sometimes they will agree that products picked to be manufactured under brand “X” will be exclusive, but other products can be sold to other companies. Sometimes the agreement will say that after “x” months the original manufacturer has the option to also sell the same product under their own brand or to sell it to other companies to be labeled under different brands.
Keep in mind that a company can buy power supplies from more than one source. If you find out that model ABC from brand MNO was manufactured by company XYZ, this does not necessary mean that all other models from MNO will also be from XYZ.
So, how can we find out who is the real manufacturer of a given power supply? There are some ways.
Today, the best way to discover a power supply real manufacturer and original model number is through its 80 Plus report, provided that the unit is 80 Plus-certified, of course. Using this method you don’t need to disassemble the power supply or even have it in your possession, and you also may be able to find models from other brands that are internally identical to the unit you are researching. We will explore this technique in the next page."
Source: Hardware Secrets