In the comparison charts for the 8600m GT, you can see that it tests at 34% faster than the 9400M. This is likely due to the dedicated memory of the 8600m GT, versus the integrated memory use of the 9400m. Even so, Blizzard's minimum specs are floor specs, and if your graphics card doesn't cut the snuff, so to speak, your computer will compensate in other ways by still exceeding the minimum requirements. I would *strongly* recommend upgrading to 10.7. Intel-based chipsets should see a significant speed increase by doing that.
Regardless, I think you'll be okay, probably running around 15-20 fps with occasional slowdown for large encounters or effects-heavy spells. Just guessing though.
Thanks for the reply.
So upgrading to Lion will increase the graphical performance? That's good to hear. But i'll prefer to test if i can run it with my current setup if i have the luck to get access to the beta., Would not like the idea to spend 29$ if its not necessary . But i'm gonna do some research on this.
Hopefully i'll be able to get a decent framerate , although i plan on buying a new laptop ( need to be mobile , tower just wont do) if possible i'll use my macbook until ssd is cheaper and 28nm gpu's are available for a reasonable price (??? around this time next year???)-> Complete tech noob, but it all sounds so nice when you read about it