We going absolute offtopic but since its about mages its totally fine by mebelendor wrote: about frost mage: it's more a pvp spec afaik :p
Each of 3 classes (not talent setups, thats different) have each specific talent for proc which is root of their class.
Arcane have Missile Barrage, fire have Hot Streak and frost have Brain Freeze.
Missile Barrage have 40% static chance to proc so arcane goes for haste to have more procs. More haste you have more proc per min you have.
Hot Streak have variable chance to proc depended on amount of crit rating. More crit rating more chance to proc and on 60% it becoming really nice.
And then you have retarded Brain Freeze with super low proc chance that you cant increase with crit like Hot Streak but you can try with haste like for Missile Barrage and it would still suck because unlike arcane`s 40% chance this crap have only 15%.
And that is why you wont find PvE Frost spec unless its troll, ignorant or just screwing around.