The i7 2630QM is a quad-core with (8 threads), sorry for the bad explanation
Do you wanna upgrade because of gaming or overall performance?
the i7 will produce more heat and needs more wattage
i5-2410m = 35W (Tjunction=100°C/max. Temp.)
i7-2630qm = 45W (Tjunction=100°C/max. Temp.)
How much wattage does the external power supply have? Eventually you will need to buy another psu with more power.
I don´t know, if the cooling system inside your asus k43sv with I5 is comparable to an asus k43sv with I7. You could get temperature problems with the i7. Which temperature is your current I5 reaching under load? Test with the tools prime95 and realtemp for about 10minutes and post the Temp.
If you really replace the i5, you will need new thermal paste for the new CPU, like Coolaboratory Liquid Pro. Most likely the heatsink is not cooling just the i5, but the graphics chip too. So you need to replace the thermal compound of this chip.