Talk:Heimerdinger/@comment-4184629-20120621190607/@comment-5052127-20120622154025

If his cdr is capped (his ult + an item&masteries or blue buff)... he tends to do a LOT more damage in team fights and be much more useful late, also CDR, like MPen, scales with the very nice base damages on his abilities, making it very valuable for him.

Basically, this is how it tends to work out with CDR... If it's not capped at 40%, he will get only one use each out of grenade and rocket in any typical fight, even if his ult is maxed... if you max his CDR at 40%, his cds are just short enough that you will almost always get 2 casts of each in that same fight.

Considering how often his turrets get blown up late, this means that extra 20% cdr reduction on him above what he gets from his ult nearly doubles his damage in an average team fight, as well as making him safer since he will have his stun up more often and be able to spam defensive attacks like rockets and turrets behind him if being chased.