How well can my graphics card overclock to?

It has very little to do with the fans.

As always with overclocking, if you want to find you then you have to try it.

What I'm saying is this: All hardware, even the same models of cards, will overclock differently. They will reach different peak speeds on the core, on the memory, they will require different voltages, and they will produce different amounts of heat.
 

chinchilla_bob

Honorable
Mar 27, 2012
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Ensure good airflow through and around your system/case/card to ensure temps don't cause stability issues so you get the most out of your overclock