2 of these popped with quite big bang 3-5 minutes after i plugged them in. They were DPS-1200FB A versions, bought from the ebay.
I suspect it is just faulty fan what does not start up, dust or whatever reasons since these were second hand. I checked the second one with thermal camera and the surface temp got over 100c just before it popped, in normal situation, the fan will start when the surface temp is somewhere near 60-70c already.

I do not use any adapter boards, i direct solder the wires.