yep, that is exactly what it means. the new ATX standard utilizes a 24pin atx connector. the extra 4 pins are for more 12v power lines to the mobo. So the 20+4 is a newer style atx2.0 compatable psu, but the extra 4 pins can be unclipped so the psu can still be used in an older mobo.
I would venture to say that your mobo requires a 24pin psu so you'd be safe with either a 20+4 or a full 24pin psu
A forum community dedicated to overclocking enthusiasts and testing the limits of computing. Come join the discussion about computing, builds, collections, displays, models, styles, scales, specifications, reviews, accessories, classifieds, and more!