im only cooling my 3 7950´s with air ... no problem so far
watercooling is to expensive and not necessary for me.
Antec 620 is only like $55, get a DWOOD bracket for $6, cooper shim for $2 and thermal paste for $6. You can go from 550 MH/s to 875 MH/s
So for $69 you can increase your output by 60%. (Sorry in advance for the double negative) Seems like you cannot afford not to.
Not mention the noise lower.
this sounds really interesting. which settings you are running on your 7950´s to get 875MH/s ?
do you also have to change the voltage settings ?
tia