Lowend pump replacement

As everyone knows the pump in a Zalman reserator 1 v2 should be only used to pump water to a hampster in its cage and thats it...Im using it to cool my i7 960 but im really scared to do any damage so iv replaced the pump with the Thermaltake P 500 i know its not the best, i was going to buy the swiftech 655 but i thought it would create to much pressure in the tank because my reserator isnt a rad & that pump i understand is a high flowing pump and under some circumstances i heard it could create 50 psi so if this is the case id only be worrying to pop somthing like a seal in my northbridge or my water block or maybe im just worrying for nothing...