If his case has some half ass air flow and isn't low profile he should be fine. If he goes for a external exhausting card then he/she should be fine but if not running without the side panel and adding a fan or two will work out.
my unit is a dell studio xps, its a mid size case . gforce 9800 gt fits in it fine. is this card lot bigger physically than that? does is run much hotter than the 9800 gt? and to be honest with you i don't know if its single or dual slot.