Customers-particularly those who consider themselves loyal customers-may very well see the forced incompatibility as a predatory move intended to force customers to use NVIDIA solutions. In taking it, however, NVIDIA is taking a significant risk. Locking out ATI today (and, we suppose, future Larrabee cards) is a logical business step. NVIDIA has invested a lot of money and time into PhysX and PhysX development the company has good reason not to want to hand all of its hard work over to competitors. When asked for the reason behind the change, an NVIDIA representative stated: 'For a variety of reasons - some development expense some quality assurance and some business reasons NVIDIA will not support GPU accelerated PhysX with NVIDIA GPUs while GPU rendering is happening on non-NVIDIA GPUs.' From a certain perspective, this definitely makes sense. That's what's happened over at NGOHQ, where forum reader DarthCyclonis discovered that NVIDIA drivers released after the v185.85 WHQL package (i.e, 186.18 and higher) removed the ability to use a GeForce 8xxx, 9xxx, or 2xx card as a dedicated PhysX processor if an non-NVIDIA GPU is present. Every so often, someone on the 'Net stumbles across something noteworthy, but the news doesn't spread until weeks or maybe even months later.

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