Well, it seems that no matter how much voltage I put in the card can't go over 1ghz. I've tried with the vcore switch (also with OCP switch) and an unlocked bios (1.21) and even with temps lower than 55º it can't pass the ghz. The voltmeter reads 1.26v on load.

I was expecting better OC on water

Anyhow, thanks to all for your help.