According to Mercury research, Nvidia holds 60 percent of AMD's chipset market. Nvidia has held this number since Q3 2006, and in the last eight quarters Nvidia was stable between 60 and 63 percent of the total market. This is an impressive achievement.

Since Q3 2007, AMD went up from 26 percent to a current 37 percent, and it mainly gained market share from Via. This was the time when AMD launched its AMD 7 series of chipsets that are doing quite well.  

Both SIS and VIA had under 2 percent of the market each in Q1 2008, while in Q2 2008 SIS has around  one percent while VIA went under one percent. It looks they are getting out of the business.

We believe that AMD might gain some more market share in this and next quarter, but this purely depends on the Phenom adoption rate. Nvidia would be helping AMD if they would open up SLI, and they don’t want that, as AMD already has some state-of-the-art chipsets.