The internal temps are great on this laptop, it doesnt need a laptop cooler. That being said, I sit mine on a zalman nc2000 when working at my desk on an external screen. The only reason being I bought it for my xps16 which was a scorching bucket of poo!.
With the zalman the temps are a few degrees lower and the fans hardly ever ramp up whilst gaming and rarely come on surfing the net.
I also noticed, just by elevating the rear you get far better temps.
But to proove it isnt necessary, I took it to a lan evening and gamed on it for 5 hours with the gpu heavily overclocked and the laptop was still cool on the top and only hot in the area mentioned (ie the nametag area). the internal temps maxed out at 71c for the gpu and mid 70's on the cpu which is amazing.