The overclocked HD 4890 Anandtech used should have more BW than my Toxic card which is running @ 1000|1100. Mine has 140.8
Personally, I like the Sapphire Toxic HD 4890 better than anything on the market price vs performance, and for its thermal/acoustic properties.
For anyone considering multi-GPU I would say hands down go nVidia. I've been using SLi and Crossfire for the past few years regularly. nVidia has their stuff together much better in that department.