Haswell Graphics for Nuendo?

Hi, all.

I am planning for my new pc build, and considering upgrading from Cubase to Nuendo. I have no experience with Nuendo and due to the nature of the software, am curious about the recommended graphics. Is an external card necessary for the new Z87 chipset? Is anyone using the integrated graphics on the Haswell chip?

Cubase or Nuendo performance would be the same.
for most plug-ins onboard is fine there are a few who need a good Open GL card or Cuda card…
(Waves, Nebula) to mention a few…

Cubendo in of itself is fine with it… why move to Nuendo?