Ok here goes,
With thanks to httuner I have hit the 21000 mark in vantage. But ive cranked it down slightly to give me a more comfortable overclock so I don't need the Turbo Fan operating. I wasn't able to get to 1300Mhz memory clock as previous posts have achieved, probably due to cooling, or different driver as im currently using 314.21 using modded INF from laptopvideo2go on windows 8. Its hovering nicely at a max of 60 degrees centigrade so I know this card can go further, but I think its either the brick, or the Video voltage which is restricting me. I have updated the firmware to the unofficial MSI version to turn off throttling which was supposed to increase temperature, but I havnt seen an increase. And to be fair this is the coolest card I have overclocked. I am hitting 680m stock easily without stressing it too much and I know it can go further. Its just having the bottle to do it. lol.
Ok here is my stable GPU-Z screen shot
and here is my 3d Mark Vantage screen grab
Im not getting near HTTUNER but im quite happy with what has been achieved today so far using the modded Vbios.
Here is the 3dMark 11 shot
The core clock will go further so maybe just maybe later I will give it a go
Thanks again to httuner