Managing IT Assets with CMMS

I’ve talked with more than one client recently who had this idea, which prompted me to ask around and see if there is a trend going recently that might warrant some exposure:  The burden of tracking IT assets (computers, servers, hardware and related serial numbers, peripherals, components, etc) is being handled at some companies using CMMS.  Sure, there are specific products designed for this IT asset management process, yet CMMS was not originally intended for that use.  My questions are where do systems fall down when compared to say, the IBM version specifically made for IT Asset Management?  If the fallbacks are few, it seems the dollar savings might be large if one can utilize an existing CMMS compared to obtaining a new, separate ITAM system.