Haswell (microarchitecture)

Haswell

A Haswell wafer with a pin for scale
CPUID code	0306C3h
Product code	80646 (desktop LGA 1150) 80647 (mobile Socket G3) 80648 (desktop LGA 2011-3) 80644 (server LGA 2011-3)
Cores	2–4 (mainstream) 6–8 (enthusiast) 2–18 (Xeon)
L1 cache	64 KB per core
L2 cache	256 KB per core
L3 cache	2–40 MB (shared)
L4 cache	128 MB of eDRAM (Iris Pro models only)
Model	Haswell Haswell Refresh Haswell-E Haswell-EP Haswell-EX
Created	2013
Transistors	22 nm (Tri-Gate)
Architecture	Haswell x86
Instructions	MMX, AES-NI, CLMUL, FMA3
Extensions	x86-64, Intel 64 SSE, SSE2, SSE3, SSSE3, SSE4, SSE4.1, SSE4.2 AVX, AVX2, TXT, and TSX (disabled via microcode, except for Haswell-EX) VT-x, VT-d
Socket(s)	LGA 1150 rPGA 947 BGA 1364 BGA 1168 LGA 2011-v3
Predecessor	Ivy Bridge (Tick)
Successor	Broadwell (Tock/Process)
GPU	HD Graphics 4200 HD Graphics 4400 HD Graphics 4600 HD Graphics 5000 Iris 5100 Iris Pro 5200
Brand name(s)	Core i3 Core i5 Core i7 Xeon E3 v3 Xeon E5 v3 Xeon E7 v3 Pentium Celeron

Haswell is the codename for a processor microarchitecture developed by Intel as the "fourth-generation core" successor to the Ivy Bridge microarchitecture. Intel officially announced CPUs based on this microarchitecture on June 4, 2013 at Computex Taipei 2013, while a working Haswell chip was demonstrated at the 2011 Intel Developer Forum. With Haswell, which uses a 22 nm process, Intel also introduced low-power processors designed for convertible or "hybrid" ultrabooks, designated by the "Y" suffix.

Haswell CPUs are used in conjunction with the Intel 8 Series chipsets, Intel 9 Series chipsets, and Intel C220 series chipsets.

The Haswell architecture is specifically designed to optimize the power savings and performance benefits from the move to FinFET (non-planar, "3D") transistors on the improved 22 nm process node.

Haswell has been launched in three major forms:

Compared to Ivy Bridge:

Around the middle of 2014, Intel released a refresh of Haswell, simply titled Haswell Refresh. When compared to the original Haswell CPUs lineup, Haswell Refresh CPUs offer a modest increase in clock frequencies. Haswell Refresh CPUs are supported by Intel's new 9 Series chipsets (Z97 and H97, codenamed Wildcat Point), while motherboards with 8 Series chipsets (codenamed Lynx Point) usually require a BIOS update to support Haswell Refresh CPUs.

The CPUs codenamed Devil's Canyon, covering the i5 and i7 K-series , employ a new and improved thermal interface material (TIM) called next-generation polymer thermal interface material (NGPTIM). This improved TIM reduces the CPU's operating temperatures and improves the overclocking potential, as something that had been problematic since the introduction of Ivy Bridge. Other changes for the Devil's Canyon CPUs include a TDP increase to 88 W, additional decoupling capacitors to help smooth out the outputs from the fully integrated voltage regulator (FIVR), and support for the VT-d that was previously limited to non-K-series SKUs.TSX was another feature brought over from the non-K-series SKUs, until August 2014 when a microcode update disabled TSX due to a bug that was discovered in its implementation.