to try to answer your question, for the same size 12V fan such as 80x80x25 mm as in D80SH-12, DC12V, GP suffix has to do w power rating. M-GP1: 0.18 A or 0.21 A M-GP2: 0.30 A M-GP3: 0.30 A or 0.70 A (if D80-SH12C) [IMAGE]   [IMAGE] PS If you are experienced with psu electrical safety then understand you want to replace fan inside psu. if not it may be wise not to open up and service a psu inside because there can be dangerous or lethal current/voltage discharge even when unplugged from power.
I am shopping for a new fan for my power supply & am wondering what the "M-GPx" value indicates (x=1 / 2 / 3, etc). I thought google knew everything, maybe it's part of the part#?My fan has these values:D80SH-12 (HH-07)M-GP5 (i can't read my own writing, not sure on that)DC-12v .30 amp ThanksJohn  
What does this string on a power supply fan mean?...