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I don't know if overclocking GPUs can reduce render time of Octane...

Hi nguyentrung13,
I'm not an hardware expert, but yes, you can overclock your GPU for getting a better score, but you could also lose in stability, especially in long rendering sessions.
If your GPUs have hybrid or water cooling, you can gain a bit further.
Please, have a look at this other discussion for a direct example:
viewtopic.php?f=11&t=45807&hilit=overcl ... 10#p229922
ciao beppe

If GPU uses boost core* then you won't lose stability but videocard has controlled to auto-increase or -decrease core speed for prevent stability.

* - "boost core" requires Kepler card or newer cards.

Thank you all