The following post has more information. But I believe that quad core CPUs are not compatible.

https://www.dell.com/community/Laptops-General-Read-Only/Inspiron-N7110-processor-upgrade/td-p/3861414

I did something simmilar in my N7110.

It cames with i5-2410m. I removed and installed a i7-2670qm. Worked like a charm! Upgraded by 30-40% in chip performance.

With a good termal paste, it is running with low usage at 50 Celcius (cooler at 2700rpm), and at high usage, it goes up to 85 Celcius (at 4500rpm). (limit is 100 C).

Info: I silenced the A/C adapter warning at bios, because I am still using the original 90W adapter. Bios recomends a 130W one (because i7 spends 45w, and i5, 35w). But if you use normally, it will be good. Be carefull to not warm so much the power adapter (hot days, no air flow...).

Another thing: I had to use ThrottleStop (disabling the "BD PROCHOT" flag) program to let processor frequency works normally, at 2.2Ghz up to 3Ghz boost (may be because I was using a 90W power source that Dell had told to processor to work at low frequency).

PS: I also installed two 8Gb Ram Memory, letting it operates with 16Gb at dual channel.