Sandy Bridge

Intel released Sandy Bridge in January 2011 as the major successor to Nehalem. Core i7, i5 and i3 variants were released simultaneously. Sandy Bridge can support an on-die integrated graphics processor. All Sandy Bridge processors to date use the new LGA 1155 socket ("Socket H2"), the successor to LGA 1156 ("Socket H"). The P67, H67, and H61 chipsets have been released to support Sandy Bridge, and are compatible with all current variants. It exhibits the ring-based bus designed for Larrabee and supports AVX instructions.

Family

• Core i7 exhibits the highest clock speeds and largest speedups from Turbo Boost. It uses SMT and provides vPro and AES-NI instructions.
• Core i5 does not support SMT.
• Core i3 does not support Turbo Boost, vPro, or AES-NI. It *does* support SMT.

All current Core i7 and Core i5 Sandy Bridge processors are quad-core, while Core i3 is dual-core. Assuming SMT to be enabled where possible, this means Core i7 provides 8 execution units, while Core i5 and Core i3 both provide 4. Without HyperThreading, the Core i3 provides 2, while the others provide 4.

Processor Support

IGP

The 2000-series IGP has 6 execution units, while the 3000 has 12. Currently, 3000-series IGP's are reserved for K-series processors. The P67 performance-oriented chipset cannot make use of the IGP, and requires a discrete graphics adapter.

Chipset

The chipset is connected to the processor via a 20Gb/s Direct Media Interconnect. The P67 chipset provides 16 more PCIe lanes than H67, and explicitly supports overclocking (K-series i7 and i5 processors provide unlocked multipliers). It does not support the IGP, but does provide lane-splitting for SLI/CrossFire setups.

Sources

• "Introducing the P67 Express", The Tech Report, 2011-01-04