I am not expert, but EVGA's BQ series is splitted in two categories: a) 650/750/850 and b) 500/600 and I think there are significant differences because they have 5 and 3 years warranty respectively. I compared EVGA BQ 650 with Seasonic S12iii, which is in the same rank, and I found out that BQ 650 has OCP protection (and also 3.3 and 5 combined give 30 watt more), but Seasonic S12iii lacks of it. At the same time, Gigabyte P650B has OCP protection and it is ranked higher. In the Methodology, you don't require OCP, but "independent regulation", something I don't understand, because I am no expert, but I wasn't able to find/track it either at gigabyte's site or at your russian site source.
I just feel BQ is underrated, that's all.
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