Gigabyte apparently has built a i915 board that combines the 4 remaining 1x PCIe lanes into a single 4x lane, and lets you run an imbalanced 16x-4x SLI setup.
http://www.de.tomshardware.com...rd/20041130/index.html
http://www.de.tomshardware.com...rd/20041130/index.html
