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Without being able to test it or have done it on that model it is hard to say for sure???

The i3 2350M TDP is 35W and the Stepping is J11

The  i7 2670QM TDP is 45W and the Stepping is D2

It is reported it has a 19% success rate.

http://www.cpu-upgrade.com/CPUs/Intel/Core_i3_Mobile/i3-2350M_(PGA).html

You could try and find out for yourself and the only thing that could happen is it would not post.

The TDP is a little hotter but I do the same thing with E6420 XFR's. "Upgrading to Quad Cores"

Before testing make sure you update the BIOS and Chipsets.

Best regards,

U2

all my drivers and bios is up to date but i asked this question because from seller i will buy he doesnt accept refund 

also if i buy it can i overclock it

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).