Completely irrelevant. SLI or Crossfire does not automatically double your performance. That's simply not how it works, least of all for basic OpenGL stuff. If at all, this would only be relevant for CUDA, but without knowing what exactly you want to do, it's impossible to gauge this stuff. For AE this applies, anyway:
And unless you use e.g. Octane, for C4D it's utterly moot just as well.