Overall, PC microprocessor shipments grew 14.3 percent sequentially, while revenue increased at a similar pace: 14.8 percent to $7.95 billion.

Of that market, AMD scored a slight victory, increasing its PC microprocessor market share a scant 0.4 percent to 23.5 percent, while Intel's share dropped the same amount to 76.3 percent. That left just 0.2 percent of the market for companies like Via to fight over.

On the other hand, all of those changes were a result of shifts in the mobile processor landscape; there was no measurable change in PC processor market share, IDC said. By form factor, AMD's share in the mobile PC processor segment rose 1.9 percent to 18.9 percent, and its share in the PC server processor segment grew 0.7 percent to 13.9 percent, the firm said.

AMD chief executive Hector Ruiz has made the mobile market a company priority.

"We attribute the market's performance to Intel's and AMD's aggressive pricing for their new platforms, which stimulated early demand from PC OEMs building PCs for the back-to-school buying season," IDC analyst Shane Rau said in a statement. "However, we also believe that real end demand is there. OEMs are passing processor savings onto consumers, who, instead of buying cheaper systems, are purchasing more robust configurations, partially to support Windows Vista."

However, both AMD and Intel reported results that belied those trends: AMD lost $390 million for the quarter, while Intel recorded profits of $1.86 billion.

Mobile PC processor shipments grew a dramatic 26.6 percent, while PC processors were up 7.7 percent. Microprocessors for servers increased by 4.6 percent, IDC said.