" Some time ago a few readers wrote in about my review of the NVIDIA Quadro4 XGL and NVS line on CGChannel, specifically on what I knew about the GeForce4 to Quadro4 hack published on Xbit Labs. I knew only that Xbit Labs did not publish benchmarks with their article, and NVIDIA’s
response that was that the hack was unsubstantiated. NVIDIA's comment was that both the Quadro4 and regular GeForce4 have hardware differences in their GPUs, making SoftQuadro and resistor hacks ineffective. "
FULL STORY @ TECH-JUNKIE (http://www.tech-junkie.com/modules.php?name=Sections&sop=viewarticle&artid=39)