AMD is getting really serious with its chipset and the multi GPU war. Its upcoming Spider platform will be powered with the RD790 chipset and it will be commercially known as the AMD 790FX. I guess that this has been done to keep it simple and close to AMD's codenames for its CPU's.
The new chipset supports both Phenom FX and Phenom X4 and it also supports Quad Crossfire. We heard that the drivers for this will be ready early next year and Nvidia is currently also working on its triple SLI driver.
This chipset should be out officially next week.