Depends on the CPU. The CPU in my laptop does low-80s without any bother. I don't like it doing that, but I don't really have any choice in that matter - and one would assume that a manufacturer such as Dell know what they're doing (it's a business-class laptop that really ought to be able to handle it).
The same can't be said for the nVidia chipset they saw fit to put in it though, but that's a different thread. :/