Broadwell (microarchitecture)

Fifth generation of Intel Core processors

Haswell and Broadwell feature a Fully Integrated Voltage Regulator.

Broadwell (previously Rockwell) is the fifth generation of the Intel Core processor. It 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.^[2][3][4] Like some of the previous tick-tock iterations, Broadwell did not completely replace the full range of CPUs from the previous microarchitecture (Haswell), as there were no low-end desktop CPUs based on Broadwell.^[5]

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 is the last Intel platform on which Windows 7 is supported by either Intel or Microsoft; however, third-party hardware vendors have offered limited Windows 7 support on more recent platforms.^[6]

Broadwell's H and C variants are used in conjunction with Intel 9 Series chipsets (Z97, H97 and HM97),^[7] in addition to retaining backward compatibility with some of the Intel 8 Series chipsets.^{[citation needed]}

Design and variants

Broadwell has been launched in three major variants:^[8]

• 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 was used, while maximum supported memory is 8 GB of LPDDR3-1600.^[9] These were the first chips to roll out, in Q3/Q4 2014. At Computex 2014, Intel announced that these chips would be branded as Core M.^[10] TSX instructions are disabled in this series of processors because a bug that cannot be fixed with a microcode update exists.^[11]
  • 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.^[12] 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.^[8] 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 was expected to come in two different variants, as single and dual chips; the dual chips (4 cores, 8 threads) would have GT3e and GT2 GPU, while a single chip (SoC; two cores, four threads) would have GT3e GPU. Maximum supported memory is 32 GB of DDR3-1600.^[9] These are scheduled for Q2 2015.^[8]
• 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.^[13]
• LGA 2011-1 socket:
  • 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.^[14][15] 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.
• LGA 2011-v3 socket:

  

  Intel i7 6800K

  • 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.^[16]
  • Broadwell-E: HEDT platform, for enthusiasts. Announced at Computex 2016, it was released in July that year. Consisting of four processors: the 6800K, 6850K, 6900K, and the deca-core 6950X, with clock speeds ranging from 3 GHz to 4 GHz as well as up to 25 MB of L3 cache.

Instruction set extensions

Broadwell introduces some instruction set architecture extensions:^[17][18]

• Intel ADX: ADOX and ADCX for improving performance of arbitrary-precision integer operations^[19]
• 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^[20]
• PREFETCHW instruction^[20]
• 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.^[21]
• 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.^[11] Erratum: In fact, among Broadwell i3, i5 and i7 CPUs, only four of them support TSX instructions (i7 5650U and 5600U, i5 5350U and 5300U); it is not even precised on Intel's website whether i5 5200U does support TSX instructions. (ark.intel.com/products/)

New features

Broadwell's Intel Quick Sync Video hardware video decoder adds VP8 hardware decoding^[22] and hybrid encoding^[23] support.^[24] HEVC decode is achieved through a combination of the fixed function video decoder and shaders.^[25] Also, it has two independent bit stream decoder (BSD) rings to process video commands on GT3 GPUs; this allows one BSD ring to process decoding and the other BSD ring to process encoding at the same time.^[26]

Broadwell's integrated GPU supports on Windows Direct3D 11.2, OpenGL 4.4 (OpenGL 4.5 on Linux^[27]) and OpenCL 2.0.^[28][29][30] However, it is marketed as Direct3D-12-ready.^[31]Broadwell-E introduced Intel Turbo Boost Max Technology 3.0.^[32]

List of Broadwell processors

Desktop processors

"Broadwell-E" HEDT (14 nm)

Embedded processors

Mobile processors

Core M Ultra Low Power Mobile Processors

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.^{[35]: 71–72}
2. This is the processor's rated frequency and TDP.^{[35]: 71–72}
3. When extra cooling is available, this mode specifies a higher TDP and higher guaranteed frequency versus the nominal mode.^{[35]: 71–72}

Server processors

SoC processors

Server CPUs

Single/dual socket CPUs

• Socket: LGA 2011-3 Just like Haswell-EP, the Broadwell-EP Xeon E5 has three different die configurations. The largest die (454 mm²), and highest core count (16 - 22) SKUs still work with a two-ring configuration connected by two bridges. The second configuration supports 12 to 15 cores and is a smaller version (306mm²). These dies still have two memory controllers. The smallest 10-core die uses only one dual ring, two columns of cores, and only one memory controller.
• Interface: PCIe 3.0

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;^[41] however, the shipment was delayed due to low yields from Intel's 14 nm process.^[42]

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 would coincide with the release of Intel's 9-series chipset, which would be required for Broadwell processors due to a change in power specifications for its LGA 1150 socket.^[43][44]

On May 18, 2014, Reuters quoted Intel's CEO promising that Broadwell-based PCs would be on shelves for the holiday season, but probably not for the back-to-school shopping.^[45]

Mobile CPUs were expected in Q4 2014 and high-performance quad-core CPUs in 2015. The mobile CPUs would benefit from the reduced energy consumption of the die shrink.^[46][47]

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.^[48]

As of July 2014^[update], Broadwell CPUs were available to Intel's hardware partners in sample quantities.^[49] Intel was expected to release 17 Broadwell U series family microprocessors at CES 2015.^[50] Also, according to a leak posted on vr-zone, Broadwell-E chips would be available in 2016.^[51]

On August 11, 2014, Intel unveiled formally its 14 nm manufacturing process, and indicated that mobile variants of the process would 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.^[52]

With Broadwell, Intel focused mainly on laptops, miniature desktops, and all-in-one systems.^[53] 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 had not given desktop PC users any good reasons to upgrade in 2015.^[53]

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.^[54]

On October 9, 2014, the first laptop with Broadwell Intel Core M 5Y70 CPU, Lenovo Yoga 3 Pro, was launched.^[55]

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.^[56]

On January 5, 2015, 17 additional Broadwell laptop CPUs were launched for the Celeron, Pentium and Core i3, i5 and i7 series.^[57]

On March 31, 2016, Intel officially launched 14 nm Broadwell-EP Xeon E5 V4 CPUs.^[58]

On May 30, 2016, Intel officially launched 14 nm Broadwell-E Core i7 69xx/68xx processor family.

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

1. Perillo, Ron (November 9, 2017). "Intel Broadwell-E CPUs Officially Discontinued". eTeknix. Retrieved July 29, 2020.
2. "22nm Details" (PDF) (presentation). Intel. Retrieved January 4, 2012.
3. Demerjian, Charlie (March 31, 2011). "After Intel's Haswell comes Broadwell". SemiAccurate. Retrieved January 4, 2012.
4. Broekhuijsen, Niels (May 22, 2014). "Intel Broadwell CPUs to Arrive Later This Year". Tom's Hardware. Archived from the original on July 27, 2014. Retrieved May 31, 2014.
5. "Lower-end desktop CPUs won't get Broadwell, will need to wait for Skylake". Ars Technica. September 5, 2014.
6. "Biostar Adds Windows 7 Support to Dozens of Current Gen Motherboards". Tom's Hardware. April 10, 2019.
7. 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.
8. "Intel Broadwell Production Plan Leaked – BDW-H Delayed To May 2015". WCCFTech. May 21, 2014. Retrieved May 21, 2014.
9. "Intel's 14nm Process 'Broadwell' Lineup Details Leaked". WCCFTech. December 12, 2013. Retrieved December 12, 2013.
10. Cutress, Ian (June 3, 2014). "Intel Keynote at Computex 2014: 14nm Core-M, SoFIA, Devil's Canyon, DC P3700 and RealSENSE". AnandTech. Retrieved June 5, 2014.
11. Wasson, Scott (August 12, 2014). "Errata prompts Intel to disable TSX in Haswell, early Broadwell CPUs". The Tech Report. Retrieved March 23, 2016.
12. "Intel Broadwell GPUs to use HD 5x00, Iris 6100 and Iris Pro 6200 branding". cpu-world.com.
13. "Intel Broadwell Core i7-5775C and Core i5-5675C Processors With Iris Pro Graphics 6200 Detailed – Launching in Q2 2015". wccftech.com. March 23, 2015. Retrieved March 24, 2015.
14. Valich, Theo (January 10, 2014). "Intel Brickland & Grantley Platforms Revealed: Ivy Bridge-EX, Haswell-EX, Broadwell-EX". Vr-zone.com. Archived from the original on February 1, 2014. Retrieved January 19, 2014.
15. Novakovic, Nebojsa (January 10, 2014). "Socket 2011 to become the dominant Intel high end physical format even on Xeon EX – but different pin-outs, of course". Vr-zone.com. Archived from the original on February 1, 2014. Retrieved January 19, 2014.
16. Anton Shilov (May 25, 2015). "Skylake Purley: Intel Xeon E5 and E7 Platform Update". xbitlabs.com. Retrieved May 25, 2015.
17. "Intel Software Development Emulator | Intel Developer Zone". Software.intel.com. July 23, 2013. Retrieved October 16, 2013.
18. Intel Architecture Instruction Set Extensions Programming Reference^{[permanent dead link]} (Document number 319433-013B) // Intel, July 2012, Chapter 9 "ADDITIONAL NEW INSTRUCTIONS"
19. New Instructions Supporting Large Integer Arithmetic on Intel Architecture Processors (Document number 327831 -001) // Intel, August 2012
20. Intel C++ Composer XE 2013 for Windows* Installation Guide and Release Notes (Document number: 321414-004US) // Intel, October 4, 2012; section "3.2.4 Inline assembly and intrinsic support for Intel architecture code named Broadwell added to Composer XE 2013 Update 1", page 13
21. Mulnix, David (2016). "Intel Xeon Processor E5-2600 V4 Product Family Technical Overview | Intel Software". Retrieved December 13, 2019.
22. "VA-API 1.3 Readies Broadwell Support, Adds VP8 Decoding". Phoronix.com. March 18, 2014. Retrieved June 10, 2015.
23. "VA-API Adds Support For VP8 Video Encoding". Phoronix.com. July 19, 2014. Retrieved June 10, 2015.
24. "intel-hybrid-driver/README at edead0c17e2818bc0fee0ea644f85ab81bbe6f7a · intel/intel-hybrid-driver". GitHub. Retrieved December 31, 2023.
25. Smith, Ryan. "Intel Broadwell Architecture Preview: A Glimpse into Core M". Retrieved October 27, 2018.
26. "Intel Broadwell GT3 Graphics Have Dual BSD Rings". Phoronix.com. Retrieved April 17, 2014.
27. "Mesa 13.0 Released With Intel OpenGL 4.5, RADV Radeon Vulkan Driver". www.phoronix.com.
28. "Intel Iris, Iris Pro, and HD Graphics Production Driver for Windows 7, 8.1, & 10". Intel Download Center.
29. "Release notes for driver version 15.40.48.5171" (PDF).
30. "Intel Developer Zone". Intel.
31. Cutress, Ian. "Broadwell GPU Improvements". Retrieved November 24, 2015.
32. "Intel Broadwell-E HEDT Core i7 Processors Launching on 30th May - Official Prices and Specifications Confirmed". May 27, 2016.
33. "Intel launches Broadwell-H chips for desktops and laptops, but world waits for 'Skylake'". Retrieved June 2, 2015.
34. "Aldi verkoopt laptop met processor van de 5de generatie". February 17, 2015. Retrieved February 18, 2015.
35. "4th Generation Intel Core processor based on Mobile M-Processor and H-Processor Lines Datasheet, Volume 1 of 2" (PDF). intel.com. December 2013. Retrieved December 22, 2013. Configurable TDP (cTDP) and Low-Power Mode (LPM) form a design vector where the processor behavior and package TDP are dynamically adjusted to a desired system performance and power envelope. [...] With cTDP, the processor is now capable of altering the maximum sustained power with an alternate guaranteed frequency. Configurable TDP allows operation in situations where extra cooling is available or situations where a cooler and quieter mode of operation is desired.
36. "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.
37. "4th Generation Intel Core processor based on Mobile U-Processor and Y-Processor Lines Datasheet, Volume 1 of 2" (PDF). intel.com. December 2013. Retrieved December 22, 2013.
38. Ian Cutress. "Intel's Core M Strategy: CPU Specifications for 9mm Fanless Tablets and 2-in-1 Devices". Retrieved January 6, 2015.
39. "Intel launches three Core M CPUs, promises more Broadwell "early 2015"". Ars Technica. September 5, 2014. Retrieved January 6, 2015.
40. "Details of first Broadwell "Y" mobile processors". cpu-world.com. July 2014. Retrieved January 6, 2015.
41. "Intel reveals 14nm PC, declares Moore's Law 'alive and well'". The Register. September 10, 2013. Retrieved September 28, 2014.
42. "Intel delays Broadwell PC chip production to early next year". CNET. October 15, 2013. Retrieved September 28, 2014.
43. "Intel's Broadwell-K launching at end of 2014 according to new roadmap". vr-zone.com. October 21, 2013. Archived from the original on October 24, 2013. Retrieved October 24, 2013.
44. Shilov, Anton (August 29, 2013). "Intel Changes Plans: Core i "Broadwell" Processors Will Be Available in LGA Packaging, But There Is a Catch". Xbit Labs. Archived from the original on October 25, 2013. Retrieved October 24, 2013.
45. "Exclusive: Intel CEO promises Broadwell PCs on shelves for holidays". Reuters. May 18, 2014. Archived from the original on May 18, 2014. Retrieved May 17, 2014.
46. "Computex 2014: Intels Broadwell kommt rechtzeitig zum Weihnachtsgeschäft". Heise.de. May 22, 2014. Retrieved May 31, 2014.
47. Chris.L (May 19, 2014). "2014 年底前絕對見到，14nm Broadwell 處理器最快在 37 周出貨". chinese.vr-zone.com. Archived from the original on May 14, 2015. Retrieved July 19, 2014.
48. Crothers, Brooke. "Intel's next-gen processor, Broadwell, is (mostly) a 2015 thing". CNET. Retrieved July 19, 2014.
49. Mark Hachman (July 15, 2014). "Intel shipping Broadwell, but next-gen Skylake chip could slip". PCWorld. Retrieved July 19, 2014.
50. "Intel to launch Broadwell "U" series CPUs at CES 2015". www.cpu-world.com.
51. "Intel's Extreme Broadwell-E chips reportedly not coming until early 2016". PC Gamer. October 22, 2014.
52. Hachman, Mark (August 11, 2014). "Intel aims next-gen 14nm 'Broadwell' technology at fanless tablets, Ultrabooks". PCWorld. Retrieved August 15, 2014.
53. "Intel regrets skipping Broadwell desktop CPUs". September 15, 2015. Retrieved October 10, 2015.
54. "Intel launches first Broadwell processors". www.cpu-world.com.
55. "The first Core M laptop paints a depressing, mediocre picture for Intel's Broadwell - ExtremeTech". ExtremeTech.
56. "Intel to release Core M 5Y10c, 5Y31, 5Y51 and 5Y71 processors". www.cpu-world.com.
57. "Broadwell U arrives: Faster laptop CPUs and GPUs from Core i7 to Celeron". ArsTechnica. January 5, 2015.
58. 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