i have heard ati having much heating issue..
also m not much interested in hp..i dont trust hp
bcoz my frnds 1year old hp dv6 with ati is unable to play crysis II
That would depend on the GPU that model has got. Not all DV6s are created equal. And if you hate HP so much, then why are even thinking of it.
Also, if possible get the FullHD screen for your Dell, because it is truly amazing. If you are getting the normal screen, then let me tell you, HP screen is better than the standard Dell XPS 15 screen. My friend just bought one, and after keeping both of them side by side, we agreed that the HP screen has slightly better colors.
HP is 50% better at gaming.
Ati doesn't has any heating issues. Actually Nvidia had heating issues in its previous series of graphic cards.
This HP can easily play almost all games on high settings.
I don't think 6770M is 50% faster than 540M, at least from what I saw on notebookcheck.net. In most cases, ATI takes the lead, but in a rare few, Nvidia is better. But overall, ATI 6770M is still better than Nvidia 540M any day.
As of now, there is no game that I can't play after maxxing out everything.
About the heating issues, My laptop is not heating that much. Earlier I used to keep it on my bed and play games, and it got quite hot. But now-a-days it is running much cooler. Even after overclocking from default 725/800 to 850/950, it never heated up that much to get me concerned even a little bit. I am running it on high performance Graphics all the time without problems, and my laptop runs for around 14 hours minimum everyday.