59w -96w wth !

i had been asking for some help around lately and yeah the forums cleared up plenty of my doubts :) .....

i decided on buying a 9600gt today and now i saw 2 versions of the 9600gt on the nvidia website - the 59watt and 96 watt ones now wth is that?

http://www.nvidia.com/object/product_geforce_9600gt_us.html

ps)9600gt from zotac better or from palit ?