Broadwell - Microarchitectures - Intel

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	Broadwell µarch
	General Info

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Broadwell (BDW) is Intel's microarchitecture based on the 14 nm process for mobile, desktops, and servers. Introduced in early 2015, Broadwell is a process shrink of Haswell which introduced several enhancements. Broadwell is named after Broadwell, Illinois.

For desktop and mobile, Broadwell is branded as 5th Generation Intel Core processors. For single-socket servers, Intel branded it as Xeon E3 v4.

Codenames

Core	Abbrev	Target
Broadwell Y	BDW-Y	Core M family, SoC for Smartphones, 2-in-1s Tablets, and notebooks
Broadwell U	BDW-U	Core ultrabooks
Broadwell H	BDW-H	IoT (QM87, HM86/HM87 Chipsets), All-in-ones
Broadwell DT	BDW-DT	Unlocked desktop MPUs
Broadwell EP	BDW-EP	Xeon E5, Dual-Processor platform
Broadwell EX	BDW-EX	Xeon E5, Multi-Processor platform, QPI
Broadwell E	BDW-E	High-End Desktops (HEDT)

Architecture

Broadwell is for the most part identical to Haswell with several enhancements, including new instruction set extensions.

Key changes from Haswell

~5% IPC improvement
FP multiplication instructions has reduced latency (3 cycles, down from 5)
- Affects AVX, SSE, and FP instructions
CLMUL instructions are now a single μop, improving latency and throughput
The second-level TLB (STLB)
- Table was enlarged (1,536 entries, up from 1024)
- 1GB page mode (16 entries, 4-ways set associative)
Larger out-of-order scheduler
Faster store-to-load forwarding
Address prediction for branches and returns was improved
Improved cryptography acceleration instructions

Core features maintained a 2:1 ratio of performance:power.

Graphics

50% higher sampler throughput
Improvements for increased geometry, Z, Pixel Fill
Direct X 11.2, OpenGL 4.3
OpenCL 1.2 and 2.0 (with Shared Virtual Memory)
Up to 24 EUs (20% addition, up from 20 in Haswell), 48 EUs on Iris Pro Graphics

New instructions

Main article: See #Added_instructions for the complete list

Broadwell introduced a number of new instructions:

RDSEED - Generates 16, 32 or 64 bit random numbers seeds (NIST SP 800-90B & NIST SP 800-90C)
ADCX - Arbitrary precision integer operations
PREFETCHW - Prefetch data into caches, hinting a write is expected in the future

Block Diagram

Memory Hierarchy

Cache
- L1 Cache:
  - 32 KB 8-way set associative instruction, 64 B line size
  - 32 KB 8-way set associative data, 64 B line size
  - Write-back policy
  - Per core
- L2 Cache:
  - 256 KB 8-way set associative, 64 B line size
  - Write-back policy
  - Per core
- L3 Cache:
  - 1.5 - 3 MB per core, 64 B line size
  - 16-20 -way set associative
  - Write-back policy
- L4 Cache:
  - 128 MB
  - eDRAM
  - shared with GPU (Crystal Well)
  - Iris Pro models only

Broadwell TLB consists of dedicated level one TLB for instruction cache and another one for data cache. Additionally there is a unified second level TLB.

TLBs:
- ITLB
  - 4KB page translations:
    - 128 entries; 4-way set associative
    - dynamic partition; divided between the two threads
  - 2MB/4MB page translations:
    - 8 entries; fully associative
    - Duplicated for each thread
- DTLB
  - 4KB page translations:
    - 64 entries; 4-way set associative
    - fixed partition; divided between the two threads
  - 2MB/4MB page translations:
    - 32 entries; 4-way set associative
  - 1G page translations:
    - 4 entries; 4-way set associative
- STLB
  - 4KB+2M page translations:
    - 1536 entries; 6-way set associative
    - shared
  - 1GB page translations:
    - 16 entries; 4-way set associative

Pipeline

Main article: Haswell's Pipeline

Broadwell's pipeline is identical to Haswell.

Die

Dual-core Broadwell die:

850px

Added instructions

RDSEED - Generates 16, 32 or 64 bit random numbers seeds (both NIST SP 800-90B and NIST SP 800-90C compliant)

RDSEED

ADCX - Arbitrary precision integer operations

ADCX
ADOX

PREFETCHW - Prefetch data into caches, hinting a write is expected in the future.

PREFETCHW

Cores

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All Broadwell Chips

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Broadwell Chips
Main processor									IGP
Model	µarch	Platform	Core	Launched	SDP	TDP	Freq	Max Mem	Name	Freq	Max Freq
3755U	Broadwell		Broadwell U	5 January 2015		15 W 15,000 mW 0.0201 hp 0.015 kW	1,700 MHz 1.7 GHz 1,700,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics (Broadwell)	100 MHz 0.1 GHz 100,000 KHz	800 MHz 0.8 GHz 800,000 KHz
i5-5350H	Broadwell			15 April 2015		47 W 47,000 mW 0.063 hp 0.047 kW	3,100 MHz 3.1 GHz 3,100,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,050 MHz 1.05 GHz 1,050,000 KHz
i5-5575R	Broadwell			15 April 2015		65 W 65,000 mW 0.0872 hp 0.065 kW	2,800 MHz 2.8 GHz 2,800,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,050 MHz 1.05 GHz 1,050,000 KHz
i5-5675C	Broadwell			15 April 2015		65 W 65,000 mW 0.0872 hp 0.065 kW	3,100 MHz 3.1 GHz 3,100,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,100 MHz 1.1 GHz 1,100,000 KHz
i5-5675R	Broadwell			15 April 2015		65 W 65,000 mW 0.0872 hp 0.065 kW	3,100 MHz 3.1 GHz 3,100,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,100 MHz 1.1 GHz 1,100,000 KHz
i7-5500DU	Broadwell		Broadwell U	2016			2,400 MHz 2.4 GHz 2,400,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB
i7-5750HQ	Broadwell			15 April 2015		47 W 47,000 mW 0.063 hp 0.047 kW	2,500 MHz 2.5 GHz 2,500,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,050 MHz 1.05 GHz 1,050,000 KHz
i7-5775C	Broadwell			15 April 2015		65 W 65,000 mW 0.0872 hp 0.065 kW	3,300 MHz 3.3 GHz 3,300,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,150 MHz 1.15 GHz 1,150,000 KHz
i7-5775R	Broadwell			15 April 2015		65 W 65,000 mW 0.0872 hp 0.065 kW	3,300 MHz 3.3 GHz 3,300,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,150 MHz 1.15 GHz 1,150,000 KHz
i7-5850EQ	Broadwell			2 June 2015		47 W 47,000 mW 0.063 hp 0.047 kW	2,700 MHz 2.7 GHz 2,700,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,000 MHz 1 GHz 1,000,000 KHz
i7-5850HQ	Broadwell			2 June 2015		47 W 47,000 mW 0.063 hp 0.047 kW	2,700 MHz 2.7 GHz 2,700,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,100 MHz 1.1 GHz 1,100,000 KHz
i7-5950HQ	Broadwell			2 June 2015		47 W 47,000 mW 0.063 hp 0.047 kW	2,900 MHz 2.9 GHz 2,900,000 kHz	32,768 MiB 33,554,432 KiB 34,359,738,368 B 32 GiB 0.0313 TiB	Intel Iris Pro Graphics 6200	300 MHz 0.3 GHz 300,000 KHz	1,150 MHz 1.15 GHz 1,150,000 KHz
i7-6950X	Broadwell		Broadwell E	31 May 2016		140 W 140,000 mW 0.188 hp 0.14 kW	3,000 MHz 3 GHz 3,000,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
5Y10	Broadwell		Broadwell Y	2 September 2014		4.5 W 4,500 mW 0.00603 hp 0.0045 kW	800 MHz 0.8 GHz 800,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	100 MHz 0.1 GHz 100,000 KHz	800 MHz 0.8 GHz 800,000 KHz
5Y10a	Broadwell		Broadwell Y	2 September 2014		4.5 W 4,500 mW 0.00603 hp 0.0045 kW	800 MHz 0.8 GHz 800,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	100 MHz 0.1 GHz 100,000 KHz	800 MHz 0.8 GHz 800,000 KHz
5Y10c	Broadwell		Broadwell Y	January 2015	3.5 W 3,500 mW 0.00469 hp 0.0035 kW	4.5 W 4,500 mW 0.00603 hp 0.0045 kW	800 MHz 0.8 GHz 800,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	300 MHz 0.3 GHz 300,000 KHz	800 MHz 0.8 GHz 800,000 KHz
5Y31	Broadwell		Broadwell Y	January 2015	3.5 W 3,500 mW 0.00469 hp 0.0035 kW	4.5 W 4,500 mW 0.00603 hp 0.0045 kW	900 MHz 0.9 GHz 900,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	300 MHz 0.3 GHz 300,000 KHz	850 MHz 0.85 GHz 850,000 KHz
5Y51	Broadwell		Broadwell Y	January 2015	3.5 W 3,500 mW 0.00469 hp 0.0035 kW	4.5 W 4,500 mW 0.00603 hp 0.0045 kW	1,100 MHz 1.1 GHz 1,100,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	300 MHz 0.3 GHz 300,000 KHz	900 MHz 0.9 GHz 900,000 KHz
5Y70	Broadwell		Broadwell Y	2 September 2014		4.5 W 4,500 mW 0.00603 hp 0.0045 kW	1,100 MHz 1.1 GHz 1,100,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	100 MHz 0.1 GHz 100,000 KHz	800 MHz 0.8 GHz 800,000 KHz
5Y71	Broadwell		Broadwell Y	January 2015	3.5 W 3,500 mW 0.00469 hp 0.0035 kW	4.5 W 4,500 mW 0.00603 hp 0.0045 kW	1,200 MHz 1.2 GHz 1,200,000 kHz	16,384 MiB 16,777,216 KiB 17,179,869,184 B 16 GiB 0.0156 TiB	Intel HD Graphics 5300	300 MHz 0.3 GHz 300,000 KHz	900 MHz 0.9 GHz 900,000 KHz
D-1513N	Broadwell	Grangeville	Broadwell DE	July 2017		35 W 35,000 mW 0.0469 hp 0.035 kW	1,600 MHz 1.6 GHz 1,600,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1518	Broadwell	Grangeville	Broadwell DE	9 March 2015		35 W 35,000 mW 0.0469 hp 0.035 kW	2,200 MHz 2.2 GHz 2,200,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1520	Broadwell	Grangeville	Broadwell DE	9 March 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,200 MHz 2.2 GHz 2,200,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1521	Broadwell	Grangeville	Broadwell DE	1 November 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,400 MHz 2.4 GHz 2,400,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1523N	Broadwell	Grangeville	Broadwell DE	July 2017		45 W 45,000 mW 0.0603 hp 0.045 kW	2,000 MHz 2 GHz 2,000,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1527	Broadwell	Grangeville	Broadwell DE	1 November 2015		35 W 35,000 mW 0.0469 hp 0.035 kW	2,200 MHz 2.2 GHz 2,200,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1528	Broadwell	Grangeville	Broadwell DE	1 November 2015		35 W 35,000 mW 0.0469 hp 0.035 kW	1,900 MHz 1.9 GHz 1,900,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1529	Broadwell	Grangeville	Broadwell DE	April 2016		20 W 20,000 mW 0.0268 hp 0.02 kW	1,300 MHz 1.3 GHz 1,300,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1531	Broadwell	Grangeville	Broadwell DE	1 November 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,200 MHz 2.2 GHz 2,200,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1533N	Broadwell	Grangeville	Broadwell DE	July 2017		45 W 45,000 mW 0.0603 hp 0.045 kW	2,100 MHz 2.1 GHz 2,100,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1537	Broadwell	Grangeville	Broadwell DE	1 November 2015		35 W 35,000 mW 0.0469 hp 0.035 kW	1,700 MHz 1.7 GHz 1,700,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1539	Broadwell	Grangeville	Broadwell DE	April 2016		35 W 35,000 mW 0.0469 hp 0.035 kW	1,600 MHz 1.6 GHz 1,600,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1540	Broadwell	Grangeville	Broadwell DE	9 March 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,000 MHz 2 GHz 2,000,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1541	Broadwell	Grangeville	Broadwell DE	1 November 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,100 MHz 2.1 GHz 2,100,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1543N	Broadwell	Grangeville	Broadwell DE	July 2017		45 W 45,000 mW 0.0603 hp 0.045 kW	1,900 MHz 1.9 GHz 1,900,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1548	Broadwell	Grangeville	Broadwell DE	1 November 2015		45 W 45,000 mW 0.0603 hp 0.045 kW	2,000 MHz 2 GHz 2,000,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1553N	Broadwell	Grangeville	Broadwell DE	July 2017		65 W 65,000 mW 0.0872 hp 0.065 kW	2,300 MHz 2.3 GHz 2,300,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1557	Broadwell	Grangeville	Broadwell DE	24 February 2016		45 W 45,000 mW 0.0603 hp 0.045 kW	1,500 MHz 1.5 GHz 1,500,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1559	Broadwell	Grangeville	Broadwell DE	April 2016		45 W 45,000 mW 0.0603 hp 0.045 kW	1,500 MHz 1.5 GHz 1,500,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1567	Broadwell	Grangeville	Broadwell DE	24 February 2016		65 W 65,000 mW 0.0872 hp 0.065 kW	2,100 MHz 2.1 GHz 2,100,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1571	Broadwell	Grangeville	Broadwell DE	24 February 2016		45 W 45,000 mW 0.0603 hp 0.045 kW	1,300 MHz 1.3 GHz 1,300,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1577	Broadwell	Grangeville	Broadwell DE	24 February 2016		45 W 45,000 mW 0.0603 hp 0.045 kW	1,300 MHz 1.3 GHz 1,300,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1581	Broadwell	Grangeville	Broadwell DE	24 February 2016		65 W 65,000 mW 0.0872 hp 0.065 kW	1,800 MHz 1.8 GHz 1,800,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1587	Broadwell	Grangeville	Broadwell DE	24 February 2016		65 W 65,000 mW 0.0872 hp 0.065 kW	1,700 MHz 1.7 GHz 1,700,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1602	Broadwell	Grangeville	Hewitt Lake	2 April 2019		27 W 27,000 mW 0.0362 hp 0.027 kW	2,500 MHz 2.5 GHz 2,500,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1612	Broadwell	Grangeville	Hewitt Lake	2 April 2019		22 W 22,000 mW 0.0295 hp 0.022 kW	1,500 MHz 1.5 GHz 1,500,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1622	Broadwell	Grangeville	Hewitt Lake	2 April 2019		40 W 40,000 mW 0.0536 hp 0.04 kW	2,600 MHz 2.6 GHz 2,600,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1623N	Broadwell	Grangeville	Hewitt Lake	2 April 2019		35 W 35,000 mW 0.0469 hp 0.035 kW	2,400 MHz 2.4 GHz 2,400,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1627	Broadwell	Grangeville	Hewitt Lake	2 April 2019		45 W 45,000 mW 0.0603 hp 0.045 kW	2,900 MHz 2.9 GHz 2,900,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB
D-1632	Broadwell	Grangeville	Hewitt Lake	2 April 2019		30 W 30,000 mW 0.0402 hp 0.03 kW	1,500 MHz 1.5 GHz 1,500,000 kHz	131,072 MiB 134,217,728 KiB 137,438,953,472 B 128 GiB 0.125 TiB

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