ur CPU temp and GPU temp?
look from graph is the turbo boost function turn off ady, which mean GPU or CPU or both is on 6X-7X degree Celsius

how do u check that?i would like to test on my y400

Yup, it's completely different... while it's intuitive with touch screen, traditional input will have some learning curve... I've tested Win8 since consumer preview so it's not that alien for me (to be frank, I still stutter and struggle for certain functions) but for those who just getting to know it, I can understand the frustration.

Desktop function is only to:-
1. maintain compatibility with older Windows apps
2. File Explorer

And the worst thing is, the search function is actually degraded from previous iteration Windows  (and the previous is already bad). Good thing it boots up fast, and I actually like the Start screen better now because it leave my desktop clean of icons and I dont have to struggle looking for my games in cluttered Start Menu 
I'm not 100% sure but I believe if there's an option for that, it will be in the BIOS menu...