Broadwell (microarchitecture)

Broadwell

CPUID code	0306D4h
Product code	80658
L1 cache	64 KB per core
L2 cache	256 KB per core
L3 cache	2–6 MB (shared)
L4 cache	128 MB of eDRAM (Iris Pro models only)
Created	2014
Transistors	14 nm transistors
Architecture	Haswell x86
Instructions	MMX, AES-NI, CLMUL, FMA3
Extensions	x86-64 SSE, SSE2, SSE3, SSSE3, SSE4, SSE4.1, SSE4.2 AVX, AVX2, TXT, TSX VT-x, VT-d
Socket(s)	LGA 1150 rPGA 947 BGA 1364 LGA 2011-v3
Predecessor	Ivy Bridge (tick) Haswell (tock)
Successor	Skylake (tock)
GPU	HD 5300 HD 5500 HD 5700P HD 6000 HD 6100 HD 6200 HD 6300P HD Graphics
Brand name(s)	Core i3 Core i5 Core i7 Core M Celeron Pentium Xeon

Broadwell is Intel's codename for the 14 nanometer die shrink of its Haswell microarchitecture. It is a "tick" in Intel's tick-tock principle as the next step in semiconductor fabrication.^[1][2][3] Like some of the previous tick-tock iterations, Broadwell will not completely replace the full range of CPUs from the previous microarchitecture (Haswell), as there will be no low-end desktop CPUs based on Broadwell.^[4]

Some of the processors based on the Broadwell microarchitecture are marketed as "5th-generation Core" i3, i5 and i7 processors. This moniker is however not used for marketing of the Broadwell-based Celeron, Pentium or Xeon chips. This microarchitecture also introduced the Core M processor branding.

Broadwell's H and C variants will be used in conjunction with Intel 9 Series chipsets (Z97, H97 and HM97), in addition to retaining backward compatibility with some of the Intel 8 Series chipsets.^[5]

Design and variants

Broadwell has been launched in three major variants:^[6]

• BGA package:
  • Broadwell-Y: system on a chip (SoC); 4.5 W and 3.5 W thermal design power (TDP) classes, for tablets and certain ultrabook-class implementations. GT2 GPU will be used, while maximum supported memory is 8 GB of LPDDR3-1600.^[7] These will be the first chips to roll out, and are expected for Q3/Q4 2014. At Computex 2014, Intel announced that these chips will be branded as Core M.^[8] TSX instructions are disabled in this series of processors because a bug that cannot be fixed with a microcode update exists.^[9]
  • Broadwell-U: SoC; two TDP classes – 15 W for 2+2 and 2+3 configurations (two cores with a GT2 or GT3 GPU) as well as 28 W for 2+3 configurations.^[10] Designed to be used on motherboards with the PCH-LP chipset for Intel's ultrabook and NUC platforms. Maximum supported is up to 16 GB of DDR3 or LPDDR3 memory, with DDR3-1600 and LPDDR3-1867 as the maximum memory speeds. The 2+2 configuration is scheduled for Q4 2014, while the 2+3 is estimated for Q1 2015.^[6] For Broadwell-U models with integrated 5x00 GPUs, die size is 82 mm² with a total of 1.3 billion transistors, while for the models with 6100 and 6200 GPUs the die size is 133 mm² with a total of 1.9 billion transistors.
  • Broadwell-H: 37 W and 47 W TDP classes, for motherboards with HM86, HM87, QM87 and the new HM97 chipsets for "all-in-one" systems, mini-ITX form-factor motherboards, and other small footprint formats. It may come in two different variants, as single and dual chips; the dual chips (4 cores, 8 threads) will have GT3e and GT2 GPU, while a single chip (SoC; two cores, four threads) will have GT3e GPU. Maximum supported memory is 32 GB of DDR3-1600.^[7] These are scheduled for Q2 2015.^[6]
• LGA 1150 socket:
  • Broadwell-DT: quad-core unlocked desktop version with GT3e integrated graphics (Iris Pro 6200) and 128 MB of eDRAM L4 cache, in a 65 W TDP class. Announced to be backward compatible with the LGA 1150 motherboards designed for Haswell processors.^[11]
• LGA 2011-v3 socket:
  • Broadwell-EP: to be marketed as Xeon E5-2600 v4 etc., while using the C610 Wellsburg chipset platform. Up to 22 cores and 44 threads, up to 55 MB of total cache and 40 PCI Express 3.0 lanes, with 55–160 W TDP classes. Maximum supported memory speed is quad-channel DDR4-2400.^[12]
  • Broadwell-EX: Brickland platform, for mission-critical servers. Intel QuickPath Interconnect (QPI) is expected to be updated to version 1.1, enabling seamless scaling beyond eight-socket systems. Maximum supported memory speeds are expected to be DDR3-1600 and DDR4-1866.^[13][14] Up to 24 core and 48 threads, up to 60 MB of L3 cache and 32 PCI Express 3.0 lanes, with 115–165 W TDP.
  • Broadwell-E: HEDT platform, for enthusiasts. With a maximum of 10 cores it is said to be released during computex in 2016. Consisting of four processors: the 6800K, 6850K, 6900K, and the deca-core 6950X with clock speeds ranging from 3 GHz to 3.9 GHz.^[15]

Instruction set extensions

Broadwell introduces some instruction set architecture extensions:^[16][17]

• Intel ADX: ADOX and ADCX for improving performance of arbitrary-precision integer operations^[18]
• RDSEED for generating 16-, 32- or 64-bit random numbers from a thermal noise entropy stream, according to NIST SP 800-90B and 800-90C^[19]
• PREFETCHW instruction^[19]
• Supervisor Mode Access Prevention (SMAP) – optionally disallows access from kernel-space memory to user-space memory, a feature aimed at making it harder to exploit software bugs.
• Transactional Synchronization Extensions: This instruction set is reintroduced for all versions of Broadwell except for Broadwell-Y because a bug that cannot be fixed via microcode update in Broadwell-Y and all versions of Haswell except for the Haswell-EX variants has been fixed with a new CPU stepping level.^[9]

New features

Broadwell's Intel Quick Sync Video hardware video decoder adds VP8 hardware decoding^[20] and encoding^[21] support. Also, it will have two independent bit stream decoder (BSD) rings to process video commands on GT3 GPUs; this will allow one BSD ring to process decoding and the other BSD ring to process encoding at the same time.^[22]

Broadwell's integrated GPU supports Direct3D 11.2, OpenGL 4.4 and OpenCL 2.0.^[23][24][25] However, it is marketed as Direct3D-12-ready.^[26]

List of Broadwell processors

Desktop processors

Target segment	Cores (threads)	Processor branding and model		GPU model	CPU frequency		TDP	Graphics clock rate		L3 cache	L4 cache[lower-alpha 1]	Release date	Price (USD)	Socket
					Base	Turbo		Base	Max
Performance	4 (8)	Core i7	5775C	Iris Pro 6200	3.3 GHz	3.7 GHz	65 W	300 MHz	1.15 GHz	6 MB	128 MB	June 2, 2015[27]	$366	LGA 1150
Mainstream	4 (4)	Core i5	5675C		3.1 GHz	3.6 GHz			1.1 GHz	4 MB			$276

Embedded processors

Target segment	Cores (threads)	Processor branding and model		GPU model	CPU frequency		TDP	Graphics clock rate		L3 cache	L4 cache[lower-alpha 1]	Release date	Price (USD)	Socket
					Base	Turbo		Base	Max
Performance	4 (8)	Core i7	5775R	Iris Pro 6200	3.3 GHz	3.8 GHz	65 W	300 MHz	1.15 GHz	6 MB	128 MB	June 2, 2015[27]	$348	BGA 1364
Mainstream	4 (4)	Core i5	5675R		3.1 GHz	3.6 GHz			1.1 GHz	4 MB			$265
			5575R		2.8 GHz	3.3 GHz			1.05 GHz				$244
Server	4 (8)	Xeon E3	1284Lv4	Iris Pro P6300	2.9 GHz	3.8 GHz	47 W		1.15 GHz	6 MB			OEM
			1278Lv4		2.0 GHz	3.3 GHz		800 MHz	1.0 GHz				$546
			1258Lv4	P5700	1.8 GHz	3.2 GHz		700 MHz			N/A		$481

Mobile processors

Target segment	Cores (threads)	Processor branding and model		GPU model	Base frequency	Turbo frequency		TDP	cTDP down	Graphics clock rate		L3 cache	Release date	Price (USD)
						Single Core	Dual Core			Base	Max
Performance	4 (8)	Core i7	5950HQ	Iris Pro 6200	2.9 GHz	3.7 GHz	N/A	47 W	N/A	300 MHz	1.15 GHz	6 MB	June 2015	$623
			5850HQ	Iris Pro 6200	2.7 GHz	3.6 GHz	N/A	47 W	N/A	300 MHz	1.1 GHz	6 MB	June 2015	$434
			5750HQ	Iris Pro 6200	2.5 GHz	3.4 GHz	N/A	47 W	600 MHz / 37 W	300 MHz	1.05 GHz	6 MB	June 2015	$434
			5700HQ	HD 5600	2.7 GHz	3.5 GHz	N/A	47 W	600 MHz / 37 W	300 MHz	1.05 GHz	6 MB	June 2015	$378
Mainstream	2 (4)		5650U	HD 6000	2.2 GHz	3.2 GHz	3.1 GHz	15 W	600 MHz / 9.5 W	300 MHz	1 GHz	4 MB	Q1 2015	$426
			5600U	HD 5500	2.6 GHz	3.2 GHz	3.1 GHz	15 W	600 MHz / 7.5 W	300 MHz	950 MHz	4 MB	Q1 2015	$393
			5557U	Iris 6100	3.1 GHz	3.4 GHz	3.4 GHz	28 W	N/A / 23 W	300 MHz	1.1 GHz	4 MB	Q1 2015	$426
			5550U	HD 6000	2.0 GHz	3.0 GHz	2.9 GHz	15 W	600 MHz / 9.5 W	300 MHz	1 GHz	4 MB	Q1 2015	$426
			5500U	HD 5500	2.4 GHz	3.0 GHz	2.9 GHz	15 W	600 MHz / 7.5 W	300 MHz	950 MHz	4 MB	Q1 2015	$393
		Core i5	5350H	Iris Pro 6200	3.1 GHz	3.5 GHz	N/A	47 W	N/A	300 MHz	1.05 GHz	4 MB	June 2015	$289
			5350U	HD 6000	1.8 GHz	2.9 GHz	2.7 GHz	15 W	600 MHz / 9.5 W	300 MHz	1 GHz	3 MB	Q1 2015	$315
			5300U	HD 5500	2.3 GHz	2.9 GHz	2.7 GHz	15 W	600 MHz / 7.5 W	300 MHz	900 MHz	3 MB	Q1 2015	$281
			5287U	Iris 6100	2.9 GHz	3.3 GHz	3.3 GHz	28 W	600 MHz / 23 W	300 MHz	1.1 GHz	3 MB	Q1 2015	$315
			5257U	Iris 6100	2.7 GHz	3.1 GHz	3.1 GHz	28 W	600 MHz / 23 W	300 MHz	1.05 GHz	3 MB	Q1 2015	$315
			5250U	HD 6000	1.6 GHz	2.7 GHz	2.5 GHz	15 W	600 MHz / 9.5 W	300 MHz	950 MHz	3 MB	Q1 2015	$315
			5200U	HD 5500	2.2 GHz	2.7 GHz	2.5 GHz	15 W	600 MHz / 7.5 W	300 MHz	900 MHz	3 MB	February 2015[28]	$281
		Core i3	5157U	Iris 6100	2.5 GHz	N/A	N/A	28 W	600 MHz / 23 W	300 MHz	1 GHz	3 MB	January 2015	$315
			5020U	HD 5500	2.2 GHz	N/A	N/A	15 W	600 MHz / 10 W	300 MHz	900 MHz	3 MB	March 2015	$281
			5015U	HD 5500	2.1 GHz	N/A	N/A	15 W	600 MHz / 10 W	300 MHz	850 MHz	3 MB	March 2015	$275
			5010U	HD 5500	2.1 GHz	N/A	N/A	15 W	600 MHz / 10 W	300 MHz	900 MHz	3 MB	January 2015	$281
			5005U	HD 5500	2.0 GHz	N/A	N/A	15 W	600 MHz / 10 W	300 MHz	850 MHz	3 MB	January 2015	$275
		Pentium	3825U	HD Graphics	1.9 GHz	N/A	N/A	15 W	600 MHz / 10 W	300 MHz	850 MHz	2 MB	March 2015
	2 (2)		3805U	HD Graphics	1.9 GHz	N/A	N/A	15 W	600 MHz / 10 W	100 MHz	800 MHz	2 MB	Q1 2015	$161
		Celeron	3755U	HD Graphics	1.7 GHz	N/A	N/A	15 W	600 MHz / 10 W	100 MHz	800 MHz	2 MB	Q1 2015	$107
			3205U	HD Graphics	1.5 GHz	N/A	N/A	15 W	600 MHz / 10 W	100 MHz	800 MHz	2 MB	Q1 2015	$107

Target segment	Cores (Threads)	Processor Branding & Model		GPU Model	Programmable TDP[29]^:69–72				CPU Turbo	Graphics Clock rate		L3 Cache	Release Date	Price (USD)
					SDP[30][31]^:71	cTDP down^[a]	Nominal TDP^[b]	cTDP up^[c]	1-core	Normal	Turbo
Mainstream	2 (4)[32]	Core M (vPro)	5Y71	HD 5300  (GT2)[33]	3.5 W	3.5 W / 600 MHz	4.5 W / 1.2 GHz	6 W / 1.4 GHz	2.9 GHz	300 MHz	900 MHz	4 MB	October 27, 2014	$281
			5Y70		N/A	N/A	4.5 W / 1.1 GHz	N/A	2.6 GHz	100 MHz	850 MHz		September 5, 2014	$281
		Core M	5Y51		3.5 W	3.5 W / 600 MHz		6 W / 1.3 GHz		300 MHz	900 MHz		October 27, 2014	$281
			5Y31				4.5 W / 900 MHz	6 W / 1.1 GHz	2.4 GHz		850 MHz
			5Y10c				4.5 W / 800 MHz	6 W / 1 GHz	2.0 GHz		800 MHz
			5Y10a		N/A	N/A		N/A		100 MHz			September 5, 2014	$281
			5Y10[34]			4 W / ? MHz

1. When a cooler or quieter mode of operation is desired, this mode specifies a lower TDP and lower guaranteed frequency versus the nominal mode.^[29]:71–72
2. This is the processor's rated frequency and TDP.^[29]:71–72
3. When extra cooling is available, this mode specifies a higher TDP and higher guaranteed frequency versus the nominal mode.^[29]:71–72

Server processors

Target segment	Cores (threads)	Processor branding and model		GPU model	Base frequency	Turbo frequency		TDP	Socket	Memory		L3 cache	Release date	Price (USD)
						Single core	All cores			Type	Channel
SoC server	8 (16)	Xeon D	D-1540	N/A	2 GHz	N/A	2.6 GHz	45 W	FCBGA 1667	DDR4	Dual	12 MB	Q1 2015	$581
	4 (8)		D-1520	N/A	2.2 GHz	N/A	2.6 GHz					6 MB	Q1 2015	$199

Target segment	Cores (threads)	Processor branding and model		GPU model	CPU clock rate		Graphics clock rate		L3 cache	TDP	Release date	Release price (USD) tray / box	Motherboard
					Normal	Turbo	Normal	Turbo					Socket	Interface	Memory
Server	4 (8)	Xeon E3 v4	1285v4	HD (P6300)	3.5 GHz	3.8 GHz	300 MHz	1.15 GHz	6 MB	95 W	Q2 15	$556 / —	LGA 1150	DMI 2.0 PCIe 3.0	DDR3 or DDR3L 1333/1600/1866 with ECC
			1285Lv4		3.4 GHz					65 W		$445 / —
			1265Lv4		2.3 GHz	3.3 GHz		1.05 GHz		35 W		$417 / —

Roadmap and history

On September 10, 2013, Intel showcased the Broadwell 14 nm processor in a demonstration at IDF. Intel CEO Brian Krzanich claimed that the chip would allow systems to provide a 30 percent improvement in power use over the Haswell chips released in mid-2013. Krzanich also claimed that the chips would ship by the end of 2013;^[35] however, the shipment was delayed due to low yields from Intel's 14 nm process.^[36]

On October 21, 2013, a leaked Intel roadmap indicated a late 2014 or early 2015 release of the K-series Broadwell on the LGA 1150 platform, in parallel with the previously announced Haswell refresh. This will coincide with the release of Intel's 9-series chipset, which may be required for Broadwell processors due to a change in power specifications for its LGA 1150 socket.^[37][38]

On May 18, 2014, Reuters quoted Intel's CEO promising that Broadwell-based PCs will be on shelves for the holiday season, but probably not for the back-to-school shopping.^[39]

Mobile CPUs are expected in Q4 2014 and high-performance quad-core CPUs in 2015. The mobile CPUs will benefit from the reduced energy consumption of the die shrink.^[40][41]

On June 18, 2014, Intel told CNET that while some specialized Broadwell-based products would be out in Q4 2014, "broader availability" (including mobile CPUs) would only happen in 2015.^[42]

As of July 2014, Broadwell CPUs are available to Intel's hardware partners in sample quantities.^[43] Intel is expected to release 17 Broadwell U series family microprocessors at CES 2015.^[44] Also, according to a leak posted on vr-zone, Broadwell-E chips will be available in 2016.^[45]

On August 11, 2014, Intel unveiled formally its 14 nm manufacturing process, which is used for Broadwell, and indicated that mobile variants of the process will be known as Core M products. Additionally, Core M products were announced to be shipping during the end of 2014, with desktop variants shipping shortly after.^[46]

With Broadwell, Intel focused mainly on laptops, miniature desktops, and all-in-one systems.^[47] This left traditional desktop users with no new socketed CPU options beyond fourth-generation Haswell, which first arrived in 2013. Even though the company finally introduced two Broadwell desktop chips in the summer of 2015, it launched its high-end sixth-generation Skylake CPUs very shortly thereafter. In September 2015, Kirk Skaugen, senior vice president and general manager of Intel's Client Computing Group, admitted that skipping desktops with Broadwell was a poor decision. Between the end-of-life for Windows XP in 2014 and the lack of new desktop chips, Intel has not given desktop PC users any good reasons to upgrade in 2015.^[47]

Releases

On September 5, 2014, Intel launched the first three Broadwell-based processors that belong to the low-TDP Core M family, Core M 5Y10, Core M 5Y10a and Core M 5Y70.^[48]

On October 9, 2014, the first laptop with Broadwell Intel Core M 5Y70 CPU, Lenovo Yoga 3 Pro, was launched.^[49]

On October 31, 2014, four more Broadwell based CPUs were launched belonging to Core M Family, increasing the number of launched Broadwell CPUs to seven.^[50]

On January 5, 2015, 17 additional Broadwell laptop CPUs were launched for the Celeron, Pentium and Core i3, i5 and i7 series.^[51]

On March 31, 2016, Intel officially launched 14 nm Broadwell-EP Xeon E5 V4 CPUs.^[52]

See also

• List of Intel CPU microarchitectures
• List of Intel Core M microprocessors

Notes

1. Implemented as eDRAM and serving primarily to increase the performance of integrated GPU, while being shared with the CPU.

References

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4. "Lower-end desktop CPUs won’t get Broadwell, will need to wait for Skylake". Ars Technica.
5. Reynolds, Sam (August 26, 2013). "Intel's 9-series chipsets will support Broadwell". vr-zone.com. Archived from the original on November 20, 2013. Retrieved November 20, 2013.
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12. Anton Shilov (May 25, 2015). "Skylake Purley: Intel Xeon E5 and E7 Platform Update". xbitlabs.com. Retrieved May 25, 2015.
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15. "Intel Broadwell-E Specifications Leaked - Core i7-6950X Flagship Processor To Rock 10 Cores and 20 Threads, Core i7-6900K, Core i7-6850K and Core i7-6800K Detailed". WCCFtech. Retrieved 2016-04-10.
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30. "The technical details behind Intel's 7 Watt Ivy Bridge CPUs". arstechnica.com. January 14, 2013. Retrieved December 22, 2013. If the CPU needs to work hard for an extended period of time and the laptop gets warmer, it will slowly ramp down its speed until it's operating at its stated TDP. [...] There are two OEM-configurable "power level" states that define how quick the CPU can be in these situations: PL2 tells the processor how much power it's allowed to use when it needs a short burst of speed, and PL1 defines how quickly the processor can run under sustained load. [...] This is at the heart of what Intel is doing with the Y-series processors: their maximum TDP has been lowered four watts, from 17 to 13. Intel is also validating them for use at two lower PL1 values: 10 watts and 7 watts. This is where the marketing we discussed earlier comes in—rather than keeping these values under the covers as it has so far been content to do, Intel has taken that lowest value, put it on its product pages, and called it SDP.
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50. "Intel to release Core M 5Y10c, 5Y31, 5Y51 and 5Y71 processors".
51. "Broadwell U arrives: Faster laptop CPUs and GPUs from Core i7 to Celeron". ArsTechnica.
52. Johan De Gelas. "The Intel Xeon E5 v4 Review: Testing Broadwell-EP With Demanding Server Workloads". anandtech.com.

External links

• Intel to launch Broadwell "U" series CPUs at CES 2015