If it were just 1 company, I maybe could consider that company didnt really care about power consumption. But since theres 2, if 1 comes in at only 50% power usage with the same perf, whod you think would sell? And before anyone says its all about preferences, and theyd sell to those "fans" anyways, the OEMs would simply put the other company out of business, as they usually dont have decent psu's in their rigs