I have just built my rig with an i7 3770k processor. It still has the standard cooler as I don't need to overclock.....yet.. 
I re-used my old graphics card but not sure if this is now a bottle neck.
My motherboard (Z77-D3H) has a DVI, VGA & HDMI sockets non are used.
I have a 512MB Sapphire HD4870 graphics card with both DVI's being used.
So.
What is the iGPU like in the i7? better/worse than HD4870?
Is it worth getting an additional (2nd hand) HD4870 and run in crossfire mode?
Or bin the lot and get the latest?
I would prefer not to spend any cash if I can, and if I do, the least the best, but will I actually notice any difference by going to an additional or newer card?

I re-used my old graphics card but not sure if this is now a bottle neck.
My motherboard (Z77-D3H) has a DVI, VGA & HDMI sockets non are used.
I have a 512MB Sapphire HD4870 graphics card with both DVI's being used.
So.
What is the iGPU like in the i7? better/worse than HD4870?
Is it worth getting an additional (2nd hand) HD4870 and run in crossfire mode?
Or bin the lot and get the latest?
I would prefer not to spend any cash if I can, and if I do, the least the best, but will I actually notice any difference by going to an additional or newer card?