It looks like AMD's plan is to use ATI's brand solely for graphics cards. Currently ATI's brandname is still used for chipsets but these will soon be shipped under AMD's brand name:
Nevertheless, the change does not involve all released ATI chipsets, only CrossFire enabled RD580, RD550, RD480 and all future chipsets for AMD platform are affected. RD600 and RS600, which are designed for Intel platform releasing in Dec 2006 and Q1 2007, are the only future ATI products excluded from this change. They are the last chipsets released by ATI.
According to the rule of denomination of AMD chipset, all AMD chipsets are denominated as AMD + chipset’s code + code of product segment, in which the product segment includes X(Multi GPU), T(Premium Class IGP), G(Mainstream Class IGP) and V(Value Class IGP). Under the rule, therefore, the previously denominated ATI Xpress 3200, codename RD580, now is denominated to AMD 580X CrossFire.
For mobile platform, the denomination is a little bit different; this is followed by AMD + M + chipset’s code. For example, RX690M is denominated as AMD M690. In addition, if the chipset has IGP, the brand of ATI is kept in the graphic part. For example, the next-generation AMD IGP RS690 has got the name AMD 690G Chipset with ATI Radeon X1250 Graphics.
More info and some AMD chipset logos can be found at HKEPC.