Hey, I know it's too late to answer, but it can help any1 who'll find this thread:
It's possible and easy to overclock this GPU... I made it and it works without problem!
Performance came up by 10-15% and temperature by 3 degreeds, so without OC: 88-92*C and with OC: 91-93*C... I am using MSI Afterburner with Core clock +130Mhz and Memory clock +115Mhz (More is possible but not stable!)...
AC IV: Black Flag wasn't possible to work on my laptop, but now: No lags or FPS falls, so works perfectly..
(P.S: Sorry for my English level

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