Original Link: http://www.anandtech.com/show/2591



Well the title is a little misleading. It isn't enabling SLI or CrossFire: it is making them irrelevant and useless by replacing them with a better GPU independent multi-GPU solution. Lucid is a company with lots of funding from Intel, and they are a chip designer that is gearing up to sell hardware that enables truly scalable multi-GPU rendering.

While graphics is completely scalable and there are native solutions to extract near linear performance gains in every case, NVIDIA and AMD have opted not to go down this path yet. It is quite difficult, as it involves the sharing of resources and more fine grained distribution of the workload. SLI and CrossFire are bandaid solutions that don't scale well past 3 GPUs. Their very course grained load balancing and the tricks that must be done to handle certain rendering techniques really hobbles the inherent parallelism of graphics.

Lucid, with their Hydra Engine and the Hydra 100 chip, are going in a different direction. With a background in large data set analysis, these guy are capable of intercepting the DirectX or OpenGL command stream before it hits the GPU, analyzing the data, and dividing up scene at an object level. Rather than rendering alternating frames, or screens split on the horizontal, this part is capable of load balancing things like groups of triangles that are associated with a single group of textures and sending these tasks to whatever GPU it makes the most sense to render on. The scene is composited after all GPUs finish rendering their parts and send the data back to the Lucid chip.

The tasks that they load balance are even dynamically defined, and they haven't gone into a lot of detail with us at this point. But we have another meeting scheduled with them today. So we'll see what happens there.

These guys say they always get near linear scaling regardless of application, and that the scaling is not limited to a number of GPUs. Meaning that 4x GPUs would actually see nearly 4x scaling. Or that 10 GPUs would see 10x scaling. The implications, if this actually works as advertised are insane.

So why is Intel interested in this? Well, they could offer a platform solution through motherboards with this chip on them that delivers better multi-GPU scaling than either NVIDIA or AMD are capable of offering natively on their own platforms. With the issues in getting NVIDIA SLI on Intel systems, this will really be a slap in the face for them.

We will definitely bring you more when we know it. At this point it seems like a great idea, but the theory doesn't always line up with the execution. If they pull of what they say they can it will revolutionize multi-GPU. We'll see what happens.

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