karthi3219
It might be similar to what I experienced recently, trying to upgrade i3-3220 with HD 2500 to i7-3770 with HD 4000: https://ledstrain.org/d/1213-intel-hd-2500-is-fine-but-hd-4000-is-straining
I could not stand HD 4000, so I switched back to my old CPU (keeping other upgrades: RAM and SSD).
There is no guarantee my setup will work for you, and I don't know why things work or don't work, but it is:
Motherboard: Asus P8H77-I with Intel H77 Express chipset
CPU: Intel i3-3220
Connection: VGA
Monitor: Philips 190VW (CCFL backlighting) at about 90% brightness, so that PWM does not bother me. The other monitor Samsung 971P is connected by DVI, but I use it as a second display only. It tires my eyes when used as the main display.
If you still have your old system, it would be ideal to simply continue using it, probably upgrading some other components if it feels slow. For me, even on an i3-3220 with 16 GB RAM and a 1 TB Samsung 870 EVO SSD everything is very fast.