All these are BOSS cards with different versions. Below are list of BOSS cards supported on R740 M7W47 - ASSY,CRD,CTL,BOSS.S1V3,SATA,FH 51CN2 - ASSY,CRD,CTL,BOSS.S1V4,SATA,FH 7HYY4 - ASSY,CRD,CTL,BOSS.S1V5,SATA,FH
Does Dell have a parts explorer? Im trying to track down the right part for the R740 BOSS card - there seem to be multiple and Im not sure if thats a by Country thing??
Dell part explorer