Overvolting 7970m some tips would be great

After a succesfull repaste, with slight OC my gpu temps never go above 63 during 30 minute MSI Kombustor burn-in test. My current stable clocks are 930-1330 and i feel like there is still lots of room for overclocking. However overvolting is required for anything above my clocks, and i am quite inexperienced at that. I am seeking some assistance/tips from those succesfully overvolted their cards.
Also what are the cons of overvolting apart from higher temps and causing shorter lifespan?

my 3dmark11 score AMD Radeon HD 7970M video card benchmark result - Intel Core i7-3740QM Processor,Alienware M17xR4 score: P7233 3DMarks

 

-Fragmentation/artifacts
-Higher Temps
-Life span
-Increased BSOD
-Micro stutter

Higher temps is the really only con, as for life span, well I have not heard of it truly being any shorter than the standard card, it all depends on how heavy the OC is and for how long between sessions, but again this really has not been proven to shorten the life of the card. Running things like furmark, or kombustor is what shortens the life IMO, it really puts a lot of stress on the hardware, again that is my opinion, I run a .025 OV and have been for the past 8 months. Now if you are looking to run lets say .100+ higher OV than stock, well maybe someone here has a personnel nightmare to share, but again its all on how you monitor and use it.

 

thanks for the reply. its good to hear someting other than you will fry your card type of stuff. My goal is to hit 1ghz core and i doubt it will require more than 0.050 OV to sustain it.

btw. what temps are you getting with your card during gaming sessions?