First off, a question: does GPU acceleration merely speed up the rendering process, or does it actually increase Lux's ability to handle "heavy" scenes with lots of figures?  Because my bottleneck with rendering in Lux has always been "it will choke on too much geometry and you have to guess how much is too much."  The memory conservative option helps a bit, but ultimately it comes down to me running this stuff on a 3 and a half year old midrange computer with 32-bit OS and 3.5G RAM, and having a thing for Optitex's high-poly dynamic clothing.

Second off: I remember looking into this matter about a year, year and a half ago and getting the impression that my ATI Radeon 3870 was not one of the supported GPUs (or one of the GPUs that had not received driver updates to support this feature).  Does anyone know if that is still the case?