If it were just the 1.7 Vs 2.4 GHz clock difference, then it wouldn't have mattered. Also for Browsing and basic word/excel etc it wont make a difference
However if i remember correctly, for the 2.4 GHZ the mobo's FSB and ram clocks were higher, which would make a 'slight' difference in the overall performace/responsiveness of the system. P4 1.7 had 400MHz fsb vs. 533 MHz, similarly 2.4 GHz proccy supported higher clock for Ram as well (333MHz as opposed to 266 for P4 1.7)