Upgrading from vista home basic to ultimate

so i am uprgrading (basic to ultimate) and i was curious as to know how much my system performance will be impacted,
some basic specs are 1.73 Ghz dual core, 256MB geforce (forget the series number or w/e), 80 GB hard drive (which only has 40) left, its a week old laptop, will i see a noticably slower computer? i pass the recomended specs with flying colors but i dont want a slower machine. Thanks,
India