MSI GT60 0NE GTX680M, insane heat with stocks clocks and vbios

[Lyff]

Hi, with stocks clocks and vbios I'm reaching 89° and throttle around 732mhz on games like Crysis 3 / BF4, even with a dock (3 fan just under gpu and cpu), cooler boost, and a thermal repaste of the gpu.

One month ago, a friend let me try his HD8970M (from a GX70), and the perfs where awesome and temps nice (around 72° after 30min of Crysis 3, without a dock)

The cpu (i7 3630qm) temps reach 84° after 30min of stress test.

Before I thinked that the 8970m was only a better and more efficient gpu than my 680m, but after some searches, I discovered that the 680m is supposed to have lower temps than a 7970m and a 8970m.

So I was wondering, what is causing this insane heat?

Thank you,

And sorry for my bad english.