BUZZ-Monte dei Paschi dips, Mediobanca rises after $14 bln bid

** Shares in Italy's Monte dei Paschi (MPS) BMPS.MI fall as much as 9.4% after launching a 13.3 billion euro ($14.0 billion) bid for rival bank Mediobanca MDBI.MI which rises as much as 3.8%

** "We think the synergy potential is limited," says brokerage Keefe, Bruyette & Woods (KBW)

** KBW says the first impression is that the offer has limited chances of success

** "Monte dei Paschi is smaller than Mediobanca and the two banks have no material overlap," KBW adds

** By 0830 GMT, the MPS stock is down 7.7% while Mediobanca rises 3.2%

** MPS is among top fallers on the pan-European STOXX 600 index .STOXX

($1 = 0.9535 euros)