E6420 XFR Cpu Upgrade

Finally realized it was an XFR laptop a year or two ago, and finally had the chance to buy one for $150 USD shipped. Great condition. No screen delam, touchscreen edition, with i5 2520m processor. 

I've already upgraded to 2 x 8 gb = 16gb ram, for $20 usd. And now i'd like to upgrade the processor to a quad core as well, and the minimum step up is 45w TDP. Which I am willing to try.

I saw that at least one person has confirmed i7 2630qm working, but has anyone tried anything faster than that?
The 2860qm looks like the fastest 45w TDP you can get without going up to 55w (which I don't want to do)

Any experiences with quad cores? Does it work ok? Doesn't overheat too crazy?