This IDC update provides the worldwide market and vendor share results for x86 PC core logic vendors in these segments for the third calendar quarter of 2008:

• Worldwide overall x86 PC core logic chipset unit share by vendor, 3Q08 with 1Q08 and 3Q07 comparison
• Worldwide overall x86 PC core logic chipset revenue share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide desktop x86 PC core logic chipset unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide mobile x86 PC core logic chipset unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC server core logic chipset unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset with integrated graphics controller unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset supporting only a discrete graphics controller unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset supporting an Intel microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset supporting an AMD microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset supporting a VIA C7 microprocessor unit share by vendor, 3Q08 with 2Q08 and 3Q07 comparison
• Worldwide x86 PC core logic chipset overall average selling prices and unit shipments for 3Q06–3Q08

The accompanying Excel spreadsheet data file includes the results of IDC's quarterly x86 PC core logic chipset studies from 1Q05 to 3Q08 in a pivot table format. The pivot table's data list, study definitions, and research methodology are also included.

Drafts of this IDC update and data file were sent via email to clients of IDC's Semiconductors: Personal Computing research program on October 29, 2008.