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Titan
Independently regulated and DC-to-DC designs tend to stay well within ATX12V specs under all load conditions.
Group regulated designs have wide voltage variation on some rails when heavily crossloaded and in some cases one or more of the rails will drop out of ATX12V specs.
Look at the Crossload 1 tests for the Antec HCG-620 or the Antec HCG-620M and you'll see that the +5V rail will drop below the +4.75V that is the minimum allowed by the ATX12V spec. The Crossload 1 tests performed in those two reviews are not even as severe as Intel's own Haswell testing methodology that uses an even lower current draw of 0.10 Amps on the +12V rail.
Both of those Antec PSUs are made by Seasonic. The Antec HCG-620M is based on the Seasonic M12II-620. The Antec HCG-620 is based on the Seasonic S12II 620.
Group regulated designs have wide voltage variation on some rails when heavily crossloaded and in some cases one or more of the rails will drop out of ATX12V specs.
Look at the Crossload 1 tests for the Antec HCG-620 or the Antec HCG-620M and you'll see that the +5V rail will drop below the +4.75V that is the minimum allowed by the ATX12V spec. The Crossload 1 tests performed in those two reviews are not even as severe as Intel's own Haswell testing methodology that uses an even lower current draw of 0.10 Amps on the +12V rail.
Both of those Antec PSUs are made by Seasonic. The Antec HCG-620M is based on the Seasonic M12II-620. The Antec HCG-620 is based on the Seasonic S12II 620.