CoolTechZone.com has posted a review on the ECS SDGE Multi-Graphics Card Technology

While the hybrid motherboard concept is all well and good, ECS is back with another technology that's worth analyzing. Welcome ECS' SDGE, or Scalable Dual Graphics Engines, technology. The basic concept behind SDGE is to combine the functionalities of NVIDIA's SLI and ATI's Crossfire technologies to come up with an in-between solution. Though it's tough to prove without actually testing the technology, but you would logically expect something like this to also have more complications than any of us would like, but let's go through SDGE and see where it stands as opposed to SLI and Crossfire.

ECS SDGE Multi-Graphics Card Technology Review