UniversaL waterblock for 5850?

[Mathsinstrument]

My stock fan is going south soon and I am interested to use some universal waterblocks for my 3x 5850s and I was wondering if that would be good idea at all?
I'm not gunning for some max out hashing performance as I am happy at 700/233 0.95v for 285mhash avg at about 65c ambient 27c on air currently. Will it overcook the vrms? Vrams are ok I guess if they are passively cooled or not at all coz mining does not heat up the vrams that aggressively, but I am more concerned about the vrms.

Can anyone offer any input?