Features carried over from Ivy Bridge •
22 nm manufacturing process •
Micro-operation cache (Uop Cache) capable of storing 1.5 K
micro-operations (approximately 6 KB in size) • 14- to 19-stage
instruction pipeline, depending on the micro-operation cache hit or miss (an approach used in the even earlier
Sandy Bridge microarchitecture) • Queue Allocation from 28/threads to 56 • Mainstream variants are up to quad-core. with up to 32 GB of
RAM on LGA 1150 variants • 64 KB (32 KB Instruction + 32 KB Data) L1 cache and 256 KB L2 cache per core • A total of 16
PCI Express 3.0 lanes on LGA 1150 variants
New features .
CPU • Wider core: fourth
arithmetic logic unit (ALU), third
address generation unit (AGU), second
branch execution unit (BEU), deeper buffers, higher cache bandwidth, improved front-end and
memory controller, higher load/store bandwidth. •
New instructions (HNI, includes
Advanced Vector Extensions 2 (AVX2),
gather,
BMI1, BMI2, ABM and
FMA3 support). • The instruction decode queue, which holds instructions after they have been decoded, is no longer statically partitioned between the two threads that each core can service. •
Fully integrated voltage regulator (FIVR), thereby moving some of the components from
motherboard onto the CPU. • New advanced power-saving system; due to Haswell's new low-power C6 and C7 sleep states, not all
power supply units (PSUs) are suitable for computers with Haswell CPUs. • 37, 47, 57 W
thermal design power (TDP) mobile processors. • 35, 45, 65, 84, 88, 95 and 130–140 W (high-end, Haswell-E) TDP desktop processors. leading to reduced heat, which results in thinner as well as lighter Ultrabooks, but the performance level is slightly lower than the 17 W version. :
GPU • Hardware graphics support for
Direct3D 11.1 and
OpenGL 4.3. Intel 10.18.14.5180 driver is the last planned driver release on Windows 7/8.1. • Four versions of the integrated GPU: GT1, GT2, GT3 and GT3e, where GT3 version has 40 execution units (EUs). Haswell's predecessor, Ivy Bridge, has a maximum of 16 EUs. GT3e version with 40 EUs and on-package 128 MB of embedded DRAM (
eDRAM), called
Crystalwell, is available only in mobile H-
SKUs and desktop (
BGA-only) R-SKUs. Effectively, this eDRAM is a Level 4 cache; it is shared dynamically between the on-die GPU and CPU, and serving as a
victim cache to the CPU's Level 3 cache.
I/O • New sockets and chipsets: • LGA 1150 for desktops, and rPGA947 and BGA1364 for the mobile market. •
Z97 (performance) and
H97 (mainstream)
chipsets for the Haswell Refresh and
Broadwell, in Q2 2014. •
LGA 2011-v3 with
X99 chipset for the enthusiast-class desktop platform
Haswell-E. •
DDR4 for enterprise/server segments and for the Enthusiast-Class Desktop Platform Haswell-E • Variable Base clock (BClk) like
LGA 2011. • Optional support for
Thunderbolt technology and Thunderbolt 2.0 • Shrink of the
Platform Controller Hub (PCH), from
65 nm to
32 nm.
Server processors features •
Haswell-EP variant, released in September 2014, with up to 18 cores and marketed as the Xeon E5-1600 v3 and Xeon E5-2600 v3 series. • Haswell-EX variant, released in May 2015, with 18 cores and functioning TSX. • A new
cache design. • Up to 45 MB total unified cache (
last level cache, LLC) for Haswell-EP and Haswell-EX. •
LGA 2011-v3 socket replaces
LGA 2011 for the Haswell EP; the new socket has the same number of pins, but it is keyed differently due to electrical incompatibility. • The already launched
Xeon E3 v3 Haswells will get a refresh in spring 2014, together with a refreshed Intel
C220 series PCH chipset. • TDP up to 160 W for Haswell-EP. • Haswell-EP models with ten and more cores support
cluster on die (COD) operation mode, allowing CPU's multiple columns of cores and
last level cache (LLC) slices to be logically divided into what is presented as two
non-uniform memory access (NUMA) CPUs to the operating system. By keeping data and instructions local to the "partition" of CPU which is processing them, therefore decreasing the LLC access latency, COD brings performance improvements to NUMA-aware operating systems and applications.
Haswell Refresh 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, usually of 100 MHz. Haswell Refresh CPUs are supported by Intel's
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 SKUs, 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.
Windows XP and Vista support While
Ivy Bridge is the last Intel processor to fully support all versions of Windows XP, Haswell includes limited driver support for certain XP editions such as POSReady2009. People have modified the graphics driver for these versions to adapt to normal Windows XP to varying degrees of success. Windows Vista support is also dropped with this processor as well. People who have installed x64 version of Vista have reported various problems such as services not starting automatically. The KB4493471 update (officially intended only for
Windows Server 2008, but can be installed on Vista) contains a HAL driver that allegedly fixes these issues; however, upon several tests it's been confirmed - it doesn't fix any of the issues. Windows XP and earlier, and all x86 versions and editions of Vista are unaffected by this bug. ==List of Haswell processors==