Quick question about the Titan xenomorph currently on offer

[Dan3458]

Hi all,

Here is the system in question http://www.overclockers.co.uk/showproduct.php?prodid=FS-237-OK

I would add another 4gb of ram.

My question is this; if I were to add an extra 5770 gpu to this rig (so would be running 2 crossfire) would the fact that it's only an i3 cause a bottleneck?

Thanks in advance.