Zen+ - Microarchitectures - AMD

	Edit Values
	Zen+ µarch
	General Info
Arch Type	CPU
Designer	AMD
Manufacturer	GlobalFoundries
Introduction	April 13, 2018
Process	12 nm
Core Configs	2, 4, 6, 8, 12, 16
	Pipeline
Type	Superscalar
OoOE	Yes
Speculative	Yes
Reg Renaming	Yes
Stages	19
Decode	4-way
	Instructions
ISA	x86-64
Extensions	MOVBE, MMX, SSE, SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, POPCNT, AVX, AVX2, AES, PCLMUL, RDRND, F16C, BMI, BMI2, RDSEED, ADCX, PREFETCHW, CLFLUSHOPT, XSAVE, SHA, CLZERO
	Cache
L1I Cache	64 KiB/core; 4-way set associative
L1D Cache	32 KiB/core; 8-way set associative
L2 Cache	512 KiB/core; 8-way set associative
L3 Cache	2 MiB/core; 16-way set associative
	Succession
	Zen Zen 2

Zen+ (Zen Plus) is the successor to Zen, a 12 nm microarchitecture designed by AMD and introduced in 2018 for the mainstream PC, enthusiast, and server markets. Zen+ is expected to be replaced by Zen 2 in 2019.

Zen+ based processors are sold under the brand Ryzen 2nd Generation.

History

Zen+ is set to succeed Zen in April of 2018. Zen+ will feature the same core as Zen but will take advantage of the new GlobalFoundries' 12nm process to deliver higher clock speeds and improved power consumption. Zen+ was initially mentioned by AMD's senior fellow and lead architect of Zen, Michael Clark, during Hot Chips 28 in 2016 as part of AMD's continuing commitment in the high-performance computing market.

Codenames

Preliminary Data! Information presented in this article deal with future products, data, features, and specifications that have yet to be finalized, announced, or released. Information may be incomplete and can change by final release.

Core	C/T	Target
Pinnacle Ridge	Up to 8/16	Mainstream to high-end desktops & enthusiasts market processors

Process Technology

See also: 12 nm process

Zen is manufactured on Global Foundries' 12 nm process Leading-Performance (12LP), an enhanced version of their 14nm process. The enhanced process is set to provide as much as 15% higher density and 10% higher performance. 12LP brings around a 10% frequency bump for the Ryzen lineup at the same power envelopes.

Compatibility

Linux added initial support for Zen starting with Linux Kernel 4.10. Microsoft officially only supports Zen on Windows 10. Windows 7 and 8 drivers are available for many mainboards. But drivers must be integrated into the installation image or installed first before switching to a Zen-based system. Otherwise support for any kind of USB device like keyboard and mouse would be missing.

Vendor	OS	Version	Notes
Microsoft	Windows	Windows 7	No Support
		Windows 8	No Support
		Windows 10	Support
Linux	Linux	Kernel 4.10	Initial Support

Compiler support

Zen+ is largely the same architecture as Zen and thus uses the same compiler switches.

Compiler	Arch-Specific	Arch-Favorable
AOCC	`‐march=znver1`	`-mtune=znver1`
GCC	`-march=znver1`	`-mtune=znver1`
LLVM	`-march=znver1`	`-mtune=znver1`
Visual Studio	`/arch:AVX2`	?

CPUID

Core	Extended Family	Family	Extended Model	Model
Pinnacle Ridge	0x8	0xF	0x0	0x8
Pinnacle Ridge	Family 23 Model 8

Release Dates

AMD intends on launching 2nd generation Ryzen in April of 2018. 2nd Generation Ryzen Threadripper and Ryzen PRO processors will launch in the second half of 2018.

Architecture

Serving as a light refresh over Zen, those processors have around ten percent higher base frequency for the same power envelope.

Key changes from Zen

~10% higher clock frequency
~3% single-thread IPC improvement
12 nm process (from 14 nm)
Precision Boost 2 (from Precision Boost)
- Uses linear model based on temp/current/voltage feedbacks (From 2-core/all-core boost model)
XFR 2 (from XFR 1)
Cache
- Improved cache prefetch
- 12 cycle L2 latency for mainstream desktop (from 17 cycles)
Memory
- Higher DDR4 transfer rate (2933 MT/s from 2666 MT/s)
Mainstream chipsets (See § Sockets/Platform)
- X370 → X470
  - New StoreMI Technology
  - Lower Power
  - Bug fixes
  - OEM related issues resolved (unspecified)

Block Diagram

Entire SoC Overview

Individual Core

Memory Hierarchy

Cache
- L0 µOP cache:
  - 2,048 µOPs, 8-way set associative
    - 32-sets, 8-µOP line size
  - Parity protected
- L1I Cache:
  - 64 KiB 4-way set associative
    - 256-sets, 64 B line size
    - Shared by the two threads, per core
  - Parity protected
- L1D Cache:
  - 32 KiB 8-way set associative
    - 64-sets, 64 B line size
    - Write-back policy
  - 4-5 cycles latency for Int
  - 7-8 cycles latency for FP
  - SEC-DED ECC
- L2 Cache:
  - 512 KiB 8-way set associative
  - 1,024-sets, 64 B line size
  - Write-back policy
  - Inclusive of L1
  - 12 cycles latency
  - DEC-TED ECC
- L3 Cache:
  - Victim cache
  - Summit Ridge, Naples: 8 MiB/CCX, shared across all cores.
  - Raven Ridge: 4 MiB/CCX, shared across all cores.
  - 16-way set associative
    - 8,192-sets, 64 B line size
  - 40 cycles latency
  - DEC-TED ECC
- System DRAM:
  - 2 channels per die
  - Summit Ridge: up to PC4-21300U (DDR4-2666 UDIMM)
  - Raven Ridge: up to PC4-23466U (DDR4-2933 UDIMM)
  - Naples: up to PC4-21300L (DDR4-2666 RDIMM/LRDIMM)
  - ECC support: x4 DRAM device failure correction (Chipkill), x8 SEC-DED ECC, Patrol and Demand scrubbing, Data poisoning

Zen TLB consists of dedicated level one TLB for instruction cache and another one for data cache.

TLBs
- ITLB
  - 8 entry L0 TLB, all page sizes
  - 64 entry L1 TLB, all page sizes
  - 512 entry L2 TLB, no 1G pages
  - Parity protected
- DTLB
  - 64 entry L1 TLB, all page sizes
  - 1,532-entry L2 TLB, no 1G pages
  - Parity protected

Core

Pipeline

Zen+ pipeline is identical to Zen's.

Memory Subsystem

When AMD presented their paper at ISSCC 2018, WikiChip was able to confirm with AMD's SoC architect that Zen's L2 latency was always designed to be 12 cycles. In fact all Zen-based microprocessors (including EPYC, Ryzen Threadripper, and Zen-based APUs) have an L2 latency of 12 cycles for all patterns. Only mainstream Zen-based Ryzen processors (i.e., Summit Ridge) have a latency of 17 cycles. The problem has been sorted out with Zen+.

Die

Zeppelin

12 nm process

Sockets/Platform

All Zen+-based mainstream consumer microprocessors utilizes AMD's Socket AM4, a unified socket infrastructure. All those processors are a complete system on a chip integrating the northbridge (memory controller) and the southbridge including 16 PCIe lanes for the GPU, 4 PCIe lanes for the NVMe/SATA controllers as well as USB 3.0. The chipset, however, extends the processor with a number of additional connections beyond that offered by the SoC.

Socket AM4 Platform [Edit]
Segment	Chipset	USB			SATA	SATAe	PCIe	RAID	Dual PCIe	Overclocking
Segment	Chipset	3.1 G1	3.1 G2	2.0	SATA	SATAe	PCIe	RAID	Dual PCIe	Overclocking
500-series (Zen+, Zen 2, Zen 3)
Mainstream	B550	2	6	6	8 + 4x NVME	0	16x Gen4	0,1,10	✔	✔
Enthusiast	X570	0	8	4	14 + 4x NVME	0	16x Gen4	0,1,10	✔	✔
400-series (Zen+)
Mainstream	B450	2	2	6	6 + 4x NVME	1	6x Gen3	0,1,10	✘	✔
Enthusiast	X470	6	2	6	10 + 4x NVME	2	8x Gen3	0,1,10	✔	✔
300-series (Zen)
Small Form Factor	A300, B300	4	0	0	2 + 2x NVMe	1	4x Gen3	0,1	✘
Small Form Factor	X300	4	0	0	2 + 2x NVMe	1	4x Gen3	0,1	✔
Entry-level	A320	6	1	6	4 + 2x NVMe	2	4x Gen2	0,1,10	✘	✘
Mainstream	B350	6	2	6	4 + 2x NVMe	2	6x Gen2	0,1,10	✘	✔
Enthusiast	X370	6	2	6	6 + 2x NVMe	2	8x Gen2	0,1,10	✔	✔

StoreMI

A new feature AMD has added to the 400-series chipset is "StoreMI", a technology with very similar capabilities to Intel's Smart Response Technology which attempts to combine the benefits of fast, but expensive, SSDs along with cheap high-capacity, but slow, HDDs. StoreMI combines the two storage devices into a single virtual drive (single letter drive on Windows) and automatically manages and moves the data across the drives. Essentially, the chipset uses the SSD as a cache for traditional hard drives. The idea is to keep the most recent and most accessed data on the SSD in order to improve real-world responsiveness while keeping the less used data in the slower mechanical hard disk in order to preserve the capacity of the SSD. It’s worth noting that this hierarchy of secondary storage devices can actually extend to main memory. Up to 2 GiB of RAM may be configured and reserved as another level of cache for the HDD on top of the SSD.

All Zen+ Chips

	List of all Zen+ based Processors
Model	Price	Launched	Family	Core	Cores	Threads	L2$	L3$	Frequency	Boost	TDP
PRO 300GE		30 September 2019	Athlon	Picasso	2	4	1 MiB 1,024 KiB 1,048,576 B 9.765625e-4 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.4 GHz 3,400 MHz 3,400,000 kHz		35 W 35,000 mW 0.0469 hp 0.035 kW
PRO 300U		8 April 2019	Athlon	Picasso	2	4	1 MiB 1,024 KiB 1,048,576 B 9.765625e-4 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.4 GHz 2,400 MHz 2,400,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
2300X		10 September 2018	Ryzen 3	Pinnacle Ridge	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	3.5 GHz 3,500 MHz 3,500,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
3200G	$ 99.00 € 89.10 £ 80.19 ¥ 10,229.67	7 July 2019	Ryzen 3	Picasso	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
3200U		6 January 2019	Ryzen 3	Picasso	2	4	1 MiB 1,024 KiB 1,048,576 B 9.765625e-4 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.6 GHz 2,600 MHz 2,600,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
3300U		6 January 2019	Ryzen 3	Picasso	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
PRO 3200G		30 September 2019	Ryzen 3	Picasso	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
PRO 3200GE		30 September 2019	Ryzen 3	Picasso	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.3 GHz 3,300 MHz 3,300,000 kHz		35 W 35,000 mW 0.0469 hp 0.035 kW
PRO 3300U		8 April 2019	Ryzen 3	Picasso	4	4	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
2500X		10 September 2018	Ryzen 5	Pinnacle Ridge	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
2600	$ 170.00 € 153.00 £ 137.70 ¥ 17,566.10	19 April 2018	Ryzen 5	Pinnacle Ridge	6	12	3 MiB 3,072 KiB 3,145,728 B 0.00293 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.4 GHz 3,400 MHz 3,400,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
2600E		10 September 2018	Ryzen 5	Pinnacle Ridge	6	12	3 MiB 3,072 KiB 3,145,728 B 0.00293 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.1 GHz 3,100 MHz 3,100,000 kHz		45 W 45,000 mW 0.0603 hp 0.045 kW
2600X	$ 229.00 € 206.10 £ 185.49 ¥ 23,662.57	19 April 2018	Ryzen 5	Pinnacle Ridge	6	12	3 MiB 3,072 KiB 3,145,728 B 0.00293 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz		95 W 95,000 mW 0.127 hp 0.095 kW
3400G		7 July 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.7 GHz 3,700 MHz 3,700,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
3500U		6 January 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
3550H		6 January 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		35 W 35,000 mW 0.0469 hp 0.035 kW
3580U		October 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
PRO 2600		6 September 2018	Ryzen 5	Pinnacle Ridge	6	12	3 MiB 3,072 KiB 3,145,728 B 0.00293 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.4 GHz 3,400 MHz 3,400,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
PRO 3400G		30 September 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.7 GHz 3,700 MHz 3,700,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
PRO 3400GE		30 September 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	3.3 GHz 3,300 MHz 3,300,000 kHz		35 W 35,000 mW 0.0469 hp 0.035 kW
PRO 3500U		8 April 2019	Ryzen 5	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.1 GHz 2,100 MHz 2,100,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
2700	$ 299.00 € 269.10 £ 242.19 ¥ 30,895.67	19 April 2018	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.2 GHz 3,200 MHz 3,200,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
2700E		10 September 2018	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	2.8 GHz 2,800 MHz 2,800,000 kHz		45 W 45,000 mW 0.0603 hp 0.045 kW
2700X Gold Edition	$ 329.00 € 296.10 £ 266.49 ¥ 33,995.57	29 April 2019	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.7 GHz 3,700 MHz 3,700,000 kHz		105 W 105,000 mW 0.141 hp 0.105 kW
2700X	$ 329.00 € 296.10 £ 266.49 ¥ 33,995.57	19 April 2018	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.7 GHz 3,700 MHz 3,700,000 kHz		105 W 105,000 mW 0.141 hp 0.105 kW
3700U		6 January 2019	Ryzen 7	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.3 GHz 2,300 MHz 2,300,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
3750H		6 January 2019	Ryzen 7	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.3 GHz 2,300 MHz 2,300,000 kHz		35 W 35,000 mW 0.0469 hp 0.035 kW
3780U		October 2019	Ryzen 7	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.3 GHz 2,300 MHz 2,300,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
PRO 2700		6 September 2018	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.2 GHz 3,200 MHz 3,200,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW
PRO 2700X		6 September 2018	Ryzen 7	Pinnacle Ridge	8	16	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz		105 W 105,000 mW 0.141 hp 0.105 kW
PRO 3700U		8 April 2019	Ryzen 7	Picasso	4	8	2 MiB 2,048 KiB 2,097,152 B 0.00195 GiB	4 MiB 4,096 KiB 4,194,304 B 0.00391 GiB	2.3 GHz 2,300 MHz 2,300,000 kHz		15 W 15,000 mW 0.0201 hp 0.015 kW
2920X	$ 649.00 € 584.10 £ 525.69 ¥ 67,061.17	29 October 2018	Ryzen Threadripper	Colfax	12	24	6 MiB 6,144 KiB 6,291,456 B 0.00586 GiB	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	3.5 GHz 3,500 MHz 3,500,000 kHz		180 W 180,000 mW 0.241 hp 0.18 kW
2950X	$ 899.00 € 809.10 £ 728.19 ¥ 92,893.67	31 August 2018	Ryzen Threadripper	Colfax	16	32	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	3.5 GHz 3,500 MHz 3,500,000 kHz		180 W 180,000 mW 0.241 hp 0.18 kW
2970WX	$ 1,299.00 € 1,169.10 £ 1,052.19 ¥ 134,225.67	29 October 2018	Ryzen Threadripper	Colfax	24	48	12 MiB 12,288 KiB 12,582,912 B 0.0117 GiB	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	3 GHz 3,000 MHz 3,000,000 kHz		250 W 250,000 mW 0.335 hp 0.25 kW
2990WX	$ 1,799.00 € 1,619.10 £ 1,457.19 ¥ 185,890.67	13 August 2018	Ryzen Threadripper	Colfax	32	64	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	3 GHz 3,000 MHz 3,000,000 kHz		250 W 250,000 mW 0.335 hp 0.25 kW
Count: 35

References

AMD CES Tech Day 2018, Jim Anderson
AMD CES Tech Day 2018, Lisa Su
AMD CES Tech Day 2018, Mark Papermaster

codename	Zen+ +
core count	2 +, 4 +, 6 +, 8 +, 12 + and 16 +
designer	AMD +
first launched	April 13, 2018 +
full page name	amd/microarchitectures/zen+ +
instance of	microarchitecture +
instruction set architecture	x86-64 +
manufacturer	GlobalFoundries +
microarchitecture type	CPU +
name	Zen+ +
pipeline stages	19 +
process	12 nm (0.012 μm, 1.2e-5 mm) +

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