It turned out that the recently announced chipset for the dual-Athlon XP configurations contains a bug. AMD representative confirmed officially that the new AMD-768 South Bridge used in AMD-760MPX has some problems. The problem lies with the improper functioning of the USB bus implemented in the chipset South Bridge in some configurations. Although the manufacturer claims that the problems turn up very rarely, most mainboard manufacturers decided to delay the supplies of their AMD-760MPX based solutions unless the situation changes for the better.
AMD intended its AMD-760MPX chipset to become a mass dual-Socket A chipset to be used by most mainboard manufacturers. The previous dual-processor product, AMD-760MP was a kind of pilot product, didn’t support 66MHz 64bit PCI bus and was supplied in limited quantities only to one AMD partner: TYAN. However, despite the initial intentions the AMD-760MPX based mainboards are also selling in limited quantities. And the discovered bug in the chipset will cause another delay in pushing dual-Socket A systems into the market. By the way, the announcement of AMD-760MPX has already been postponed once for the same reasons: it is not for the first time that AMD has some problems with its AMD-768 South Bridge. Now the company claims that the problem with AMD-768 will be eliminated within Q1 2002, as Damon Munzy said in an interview to AMDZone.
Despite the fact that many mainboard makers haven’t yet started supplying their AMD-760MPX based products, some of them are already producing the boards in mass. In particular, you can already buy ASUS A7M266-D and TYAN S2466N Tiger MPX built on a "faulty" chipset. Therefore, ASUS and TYAN have to find their own solution to the problem with the USB implementation in AMD-768. ASUS, for instance, has already found a way-out. Unless AMD eliminates the problem, the company will accompany A7M266-D with an additional USB 2.0 controller based on NEC chip.

ASUS PCI-USB2