Seasonic M12D 750 W (SS-750EM) was one of the best-performing power supplies we've reviewed to date, presenting only high-end components and a very high efficiency thanks to the DC-DC converter used on its secondary. Seasonic released now a more affordable version from this power supply, called S12D (SS-750HT), which the main difference is not coming with a modular cabling system. Let's see if this is the only difference between them.