i dont think so, i think 2.4v is still "relatively" safe
if the mfg gives you warranty with 2.4v, then use 2.4v.... its rather unlikely the memory dies, and if it does, then the mfg will replace it.

and IF it dies, its most of the time one of the "usual suspects" motherboards... and on those boards micron ddr2 can die even with 2.1v... so... id say avoid those "special" boards and most likely youll be fine, even with 2.4