Boxed Intel® Pentium® D Processors 930, 940 and 950 and Pentium® 4 Processors
631, 641, 651 and 661will undergo the following changes for the B-1 to C-1
processor stepping conversion:

• CPUID will change from F62 to F64
• C-1 is pin compatible with B-1
• New S-specs for converting products
• The advanced power management features Enhanced HALT State and Enhanced Intel
SpeedStep® Technology will be enabled (TM2 will be enabled for Pentium 4 6×1)
• The Pentium D Processors 940 and 950 will change from the 2005 Performance FMB
(130W) to the 2005 Mainstream FMB (95W)

Boxed Intel® Pentium® D Processors 930, 940 and 950 will undergo the
following changes for the B-1 to C-1 processor stepping conversion:

• CPUID will change from F62 to F64
• C-1 is pin compatible with B-1
• New S-specs for converting products
• The advanced power management features Enhanced HALT State and Enhanced Intel
SpeedStep® Technology will be enabled
• The Pentium D Processors 940 and 950 will change from the 2005 Performance FMB
(130W) to the 2005 Mainstream FMB (95W)
• The Platform Compatibility Guide indicating the processor FMB will be added to
the processor mark as illustrated with the following example:

Boxed Intel® Pentium® 4 Processors 631, 641, 651 and 661 will
undergo the following changes for the B-1 to C-1 processor stepping conversion:

• CPUID will change from F62 to F64
• C-1 is pin compatible with B-1
• New S-specs for converting products
• The advanced power management features Enhanced HALT State, Enhanced Intel
SpeedStep® Technology and Thermal Monitor 2 will be enabled
• The Platform Compatibility Guide indicating the processor FMB will be added to
the processor mark as illustrated with the following example: