Older NVidia cards tended to do a bit better with Intel CPUs, but I think it was largely a result of highest single core clock speeds and the way some game engines were built in connection with NVidia drivers likely being optimized for Intel's CPUs.
It doesn't seem like it matters at all with modern GPUs or titles though, at least not that I've seen. Most games now scale beyond utilizing only one or two cores and several benefit from having eight, so fastest single thread performance isn't quite as valuable as it used to be.
If you have a particular game you really care about it might be worth investigating in more detail, but it's more likely that one type of card does better than another for reasons entirely outside of the CPU being used.
What CPU were you using?