As of this writing no version of LightWave 9.3.1 supports OpenGL multi-threaded rendering. So while SLi or Crossfire enabled computers will certainly run LightWave the extra GPU(s) will not be taken advantage of.
What graphics cards are recommended for LightWave 9?
LightWave 9.x requires an OpenGL 2.0 (or higher) compliant graphics card with an nVidia or ATI GPU.
Minimum (64MB of RAM):
nVidia GeForce FX 5200 or
ATI Radeon 9500
Recommended (128MB of RAM):
nVidia GeForce 7300/Quadro FX 350 or higher or
ATI Radeon X1300/FireGL V5200 or higher
Does LightWave support SLi/Crossfire?
