Zen 4 - Microarchitectures - AMD

	Edit Values
	Zen 4 µarch
	General Info
Arch Type	CPU
Designer	AMD
Manufacturer	TSMC
Process	5nm, 6nm
	Succession
	Zen 3 Zen 5

Zen 4 is a planned microarchitecture being developed by AMD as a successor to Zen 3.

History

Zen 4 on the roadmap.

Zen 4 was first mentioned by Forrest Norrod during AMD's EPYC One Year Anniversary webinar. During the next horizon event which was held on November 6, 2018, AMD stated that Zen 4 was at the design completion phase.

Products

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.

Processor Series	Cores/Threads	Market
EPYC 7004 "Genoa"	Up to 96/192	High-end server multiprocessors
Ryzen Threadripper 7000 "Storm Peak"	Up to 96/192	Workstation & enthusiasts market processors
Ryzen 7000 "Raphael"	Up to 16/32	Mainstream to high-end desktops & enthusiasts market processors
Ryzen 7000 APU "Dragon Range"	Up to 16/32	High-end mobile processors with GPU
Ryzen 7000 APU "Phoenix"	Up to 8/16	Mainstream desktop & mobile processors with GPU

Cores using variant Zen 4 uarch:

Processor Series	Cores/Threads	Market
EPYC Bergamo	Up to 128/256	Cloud multiprocessors (smaller, almost half-size Zen 4c [referred to as “Zen 4D” in leaks] core sacrificing half of the L3 cache, and possibly reduced or no AVX-512)

Process Technology

Zen4 is fabricated using both the 5nm node for the Core Compute Die (CCD) and the 6nm node for the Input/Output Die (IOD) by TSMC.

Architecture

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.

Key changes from Zen 3

Core
- AVX-512 instructions support
- L1 and L2 DTLB size increased from 64 to 72 and 2,048 to 3,072 entries
- L2 cache doubled from 512 KiB to 1 MiB per core
- Max. physical and linear address size raised from 48 to 52 and 57 bits respectively
- Improved cache load, write and prefetch from/to register (less latency).
- Higher Transistor Density, due to 5nm process
- Capable of higher all-core clockspeeds (shown by AMD to reach 5GHz+ on all cores)
Package
- Raised maximum core/thread count from 64/128 to at least 96/192 (EPYC 7004) (Bergamo supports 128 cores but preliminary data shows a slightly altered architecture featuring cores that take up less space)
- Support for DDR5 memory and PCIe Gen 5
- New sockets AM5 (client), SP5 (server), SP6 (server), FP7/FP7r2 (mobile)

New Instructions

Zen 4 introduced the following ISA enhancements:

AVX-512 - 512-bit Vector Instructions
- AVX512F - Foundation (first introduced with Intel Skylake)
- AVX512CD - Conflict Detection Instructions (Skylake X)
- AVX512VL - Vector Length Extensions (Skylake X)
- AVX512DQ - Doubleword and Quadword Instructions (Skylake X)
- AVX512BW - Byte and Word Instructions (Skylake X)
- AVX512 IFMA - Integer Fused Multiply-Add (Cannon Lake)
- AVX512 VBMI - Vector Bit Manipulation Instructions (Cannon Lake)
- AVX512 VPOPCNTDQ - Vector Population Count Instruction (Ice Lake)
- AVX512 BITALG - Bit Algorithms (Ice Lake)
- AVX512 VBMI2 - Vector Bit Manipulation Instructions 2 (Ice Lake)
- AVX512 VNNI - Vector Neural Network Instructions (Ice Lake)
- AVX512 BF16 - BFloat16 Instructions (Cooper Lake)
- Not supported: AVX512ER, AVX512PF (Knights Landing); AVX512 4VNNIW, 4FMAPS (Knights Mill); VP2INTERSECT (Tiger Lake)
GFNI - Galois Field New Instructions (first introduced with Intel Ice Lake)
- VGF2P8AFFINEQB - Galois field affine transformation
- VGF2P8AFFINEINVQB - Galois field affine transformation inverse
- VGF2P8MULB - Galois field multiply bytes

Memory Hierarchy

Data and Instruction Caches

L0 Op Cache:
- 4,096(?) Ops per core, 8-way(?) set associative
- 8 Op line size(?)
- Parity protected
L1I Cache:
- 32 KiB per core, 8-way set associative
- 64 B line size
- Parity protected
L1D Cache:
- 32 KiB per core, 8-way set associative
- 64 B line size
- Write-back policy
- ? cycles latency for Int
- ? cycles latency for FP
- ECC
L2 Cache:
- 1 MiB per core, 8-way set associative
- 64 B line size
- Write-back policy
- Inclusive of L1(?)
- ? cycles latency
- DEC-TED ECC, tag & state arrays SEC-DED
L3 Cache:
- Shared by all cores in the CCX, configurable
- 16-way set associative
- 64 B line size
- L2 victim cache(?)
- Write-back policy
- ? cycles average load-to-use latency
- DEC-TED ECC, tag array & shadow tags SEC-DED
- QoS Monitoring and Enforcement

Translation Lookaside Buffers

ITLB
- 64 entry L1 TLB, fully associative, all page sizes
- 512 entry L2 TLB, ?-way set associative
  - 4-Kbyte, 2-Mbyte, and 4-Mbyte pages
- Parity protected
DTLB
- 72 entry L1 TLB, fully associative, all page sizes
- 3,072 entry L2 TLB, 12-way set associative
  - 4-Kbyte, 2-Mbyte, and 4-Mbyte pages, PDEs to speed up table walks(?)
- Parity protected

4-Mbyte pages require two 2-Mbyte entries in all TLBs.

System DRAM

EPYC 7004 "Genoa":
- 12 channels per socket, two 40-bit DDR5 subchannels per channel
- Up to 24 DIMMs, max. ? TiB
- Up to PC5-41600 (DDR5-5200)
- SR/DR RDIMM, 4R/8R LRDIMM, 3DS DIMM
- ECC supported (x4, x8, x16, chipkill)
- DRAM bus parity and write data CRC options

Sources: ^[1]

All Zen 4 Processors

	List of all Zen 4-based Processors
Model	Family	Codename	C	T	L2	L3	Base	Turbo	Memory	TDP	Launched	Price	OPN
	Uniprocessors
7600X	Ryzen 5	Raphael	6	12	6 MiB 6,144 KiB 6,291,456 B 0.00586 GiB	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	4.7 GHz 4,700 MHz 4,700,000 kHz	5.3 GHz 5,300 MHz 5,300,000 kHz		105 W 105,000 mW 0.141 hp 0.105 kW
7700	Ryzen 7	Raphael	8	16	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	3.8 GHz 3,800 MHz 3,800,000 kHz	5.3 GHz 5,300 MHz 5,300,000 kHz		65 W 65,000 mW 0.0872 hp 0.065 kW	10 January 2023	$ 339.00 € 305.10 £ 274.59 ¥ 35,028.87	100-000000592, 100-100000592BOX
7700X	Ryzen 7	Raphael	8	16	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	4.5 GHz 4,500 MHz 4,500,000 kHz	5.4 GHz 5,400 MHz 5,400,000 kHz		105 W 105,000 mW 0.141 hp 0.105 kW	27 September 2022	$ 399.00 € 359.10 £ 323.19 ¥ 41,228.67	100-000000591, 100-100000591WOF
7800X3D	Ryzen 7	Raphael	8	16	8 MiB 8,192 KiB 8,388,608 B 0.00781 GiB	96 MiB 98,304 KiB 100,663,296 B 0.0938 GiB	4.2 GHz 4,200 MHz 4,200,000 kHz	5 GHz 5,000 MHz 5,000,000 kHz		120 W 120,000 mW 0.161 hp 0.12 kW
7900X3D	Ryzen 9	Raphael	12	24	12 MiB 12,288 KiB 12,582,912 B 0.0117 GiB	128 MiB 131,072 KiB 134,217,728 B 0.125 GiB	4.4 GHz 4,400 MHz 4,400,000 kHz	5.6 GHz 5,600 MHz 5,600,000 kHz		120 W 120,000 mW 0.161 hp 0.12 kW
7950X3D	Ryzen 9	Raphael	16	32	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	128 MiB 131,072 KiB 134,217,728 B 0.125 GiB	4.2 GHz 4,200 MHz 4,200,000 kHz	5.7 GHz 5,700 MHz 5,700,000 kHz		120 W 120,000 mW 0.161 hp 0.12 kW	28 February 2023	$ 699.00 € 629.10 £ 566.19 ¥ 72,227.67	100-000000908, 100-000000908WOF
9354P	EPYC	Genoa	32	64	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.25 GHz 3,250 MHz 3,250,000 kHz	3.75 GHz 3,750 MHz 3,750,000 kHz	DDR5-4800	280 W 280,000 mW 0.375 hp 0.28 kW	10 November 2022	$ 2,730.00 € 2,457.00 £ 2,211.30 ¥ 282,090.90	100-100000805, 100-100000805WOF
9454P	EPYC	Genoa	48	96	48 MiB 49,152 KiB 50,331,648 B 0.0469 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	2.75 GHz 2,750 MHz 2,750,000 kHz	3.65 GHz 3,650 MHz 3,650,000 kHz	DDR5-4800	290 W 290,000 mW 0.389 hp 0.29 kW	10 November 2022	$ 4,598.00 € 4,138.20 £ 3,724.38 ¥ 475,111.34	100-100000873, 100-100000873WOF
9554P	EPYC	Genoa	64	128	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.1 GHz 3,100 MHz 3,100,000 kHz	3.75 GHz 3,750 MHz 3,750,000 kHz	DDR5-4800	360 W 360,000 mW 0.483 hp 0.36 kW	10 November 2022	$ 7,104.00 € 6,393.60 £ 5,754.24 ¥ 734,056.32	100-100000804, 100-100000804WOF
9654P	EPYC	Genoa	96	192	96 MiB 98,304 KiB 100,663,296 B 0.0938 GiB	384 MiB 393,216 KiB 402,653,184 B 0.375 GiB	2.4 GHz 2,400 MHz 2,400,000 kHz	3.55 GHz 3,550 MHz 3,550,000 kHz	DDR5-4800	360 W 360,000 mW 0.483 hp 0.36 kW	10 November 2022	$ 10,625.00 € 9,562.50 £ 8,606.25 ¥ 1,097,881.25	100-100000803, 100-100000803WOF
	Multiprocessors (dual-socket)
9124	EPYC	Genoa	16	32	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	3.6 GHz 3,600 MHz 3,600,000 kHz	DDR5-4800	200 W 200,000 mW 0.268 hp 0.2 kW	10 November 2022	$ 1,083.00 € 974.70 £ 877.23 ¥ 111,906.39	100-100000802, 100-100000802WOF
9174F	EPYC	Genoa	16	32	16 MiB 16,384 KiB 16,777,216 B 0.0156 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	4.1 GHz 4,100 MHz 4,100,000 kHz	4.15 GHz 4,150 MHz 4,150,000 kHz	DDR5-4800	320 W 320,000 mW 0.429 hp 0.32 kW	10 November 2022	$ 3,850.00 € 3,465.00 £ 3,118.50 ¥ 397,820.50	100-100000796, 100-100000796WOF
9224	EPYC	Genoa	24	48	24 MiB 24,576 KiB 25,165,824 B 0.0234 GiB	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	2.5 GHz 2,500 MHz 2,500,000 kHz	3.65 GHz 3,650 MHz 3,650,000 kHz	DDR5-4800	200 W 200,000 mW 0.268 hp 0.2 kW	10 November 2022	$ 1,825.00 € 1,642.50 £ 1,478.25 ¥ 188,577.25	100-100000939, 100-100000939WOF
9254	EPYC	Genoa	24	48	24 MiB 24,576 KiB 25,165,824 B 0.0234 GiB	128 MiB 131,072 KiB 134,217,728 B 0.125 GiB	2.9 GHz 2,900 MHz 2,900,000 kHz	3.9 GHz 3,900 MHz 3,900,000 kHz	DDR5-4800	200 W 200,000 mW 0.268 hp 0.2 kW	10 November 2022	$ 2,299.00 € 2,069.10 £ 1,862.19 ¥ 237,555.67	100-100000480, 100-100000480WOF
9274F	EPYC	Genoa	24	48	24 MiB 24,576 KiB 25,165,824 B 0.0234 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	4.05 GHz 4,050 MHz 4,050,000 kHz	4.1 GHz 4,100 MHz 4,100,000 kHz	DDR5-4800	320 W 320,000 mW 0.429 hp 0.32 kW	10 November 2022	$ 3,060.00 € 2,754.00 £ 2,478.60 ¥ 316,189.80	100-100000794, 100-100000794WOF
9334	EPYC	Genoa	32	64	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	128 MiB 131,072 KiB 134,217,728 B 0.125 GiB	2.7 GHz 2,700 MHz 2,700,000 kHz	3.85 GHz 3,850 MHz 3,850,000 kHz	DDR5-4800	210 W 210,000 mW 0.282 hp 0.21 kW	10 November 2022	$ 2,990.00 € 2,691.00 £ 2,421.90 ¥ 308,956.70	100-100000800, 100-100000800WOF
9354	EPYC	Genoa	32	64	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.25 GHz 3,250 MHz 3,250,000 kHz	3.75 GHz 3,750 MHz 3,750,000 kHz	DDR5-4800	280 W 280,000 mW 0.375 hp 0.28 kW	10 November 2022	$ 3,420.00 € 3,078.00 £ 2,770.20 ¥ 353,388.60	100-100000798, 100-100000798WOF
9374F	EPYC	Genoa	32	64	32 MiB 32,768 KiB 33,554,432 B 0.0313 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.85 GHz 3,850 MHz 3,850,000 kHz	4.1 GHz 4,100 MHz 4,100,000 kHz	DDR5-4800	320 W 320,000 mW 0.429 hp 0.32 kW	10 November 2022	$ 4,850.00 € 4,365.00 £ 3,928.50 ¥ 501,150.50	100-100000792, 100-100000792WOF
9454	EPYC	Genoa	48	96	48 MiB 49,152 KiB 50,331,648 B 0.0469 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	2.75 GHz 2,750 MHz 2,750,000 kHz	3.65 GHz 3,650 MHz 3,650,000 kHz	DDR5-4800	290 W 290,000 mW 0.389 hp 0.29 kW	10 November 2022	$ 5,225.00 € 4,702.50 £ 4,232.25 ¥ 539,899.25	100-100000478, 100-100000478WOF
9474F	EPYC	Genoa	48	96	48 MiB 49,152 KiB 50,331,648 B 0.0469 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.6 GHz 3,600 MHz 3,600,000 kHz	3.95 GHz 3,950 MHz 3,950,000 kHz	DDR5-4800	360 W 360,000 mW 0.483 hp 0.36 kW	10 November 2022	$ 6,780.00 € 6,102.00 £ 5,491.80 ¥ 700,577.40	100-100000788, 100-100000788WOF
9534	EPYC	Genoa	64	128	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	2.45 GHz 2,450 MHz 2,450,000 kHz	3.55 GHz 3,550 MHz 3,550,000 kHz	DDR5-4800	280 W 280,000 mW 0.375 hp 0.28 kW	10 November 2022	$ 8,803.00 € 7,922.70 £ 7,130.43 ¥ 909,613.99	100-100000799, 100-100000799WOF
9554	EPYC	Genoa	64	128	64 MiB 65,536 KiB 67,108,864 B 0.0625 GiB	256 MiB 262,144 KiB 268,435,456 B 0.25 GiB	3.1 GHz 3,100 MHz 3,100,000 kHz	3.75 GHz 3,750 MHz 3,750,000 kHz	DDR5-4800	360 W 360,000 mW 0.483 hp 0.36 kW	10 November 2022	$ 9,087.00 € 8,178.30 £ 7,360.47 ¥ 938,959.71	100-100000790, 100-100000790WOF
9634	EPYC	Genoa	84	168	84 MiB 86,016 KiB 88,080,384 B 0.082 GiB	384 MiB 393,216 KiB 402,653,184 B 0.375 GiB	2.25 GHz 2,250 MHz 2,250,000 kHz	3.1 GHz 3,100 MHz 3,100,000 kHz	DDR5-4800	290 W 290,000 mW 0.389 hp 0.29 kW	10 November 2022	$ 10,304.00 € 9,273.60 £ 8,346.24 ¥ 1,064,712.32	100-100000797, 100-100000797WOF
9654	EPYC	Genoa	96	192	96 MiB 98,304 KiB 100,663,296 B 0.0938 GiB	384 MiB 393,216 KiB 402,653,184 B 0.375 GiB	2.4 GHz 2,400 MHz 2,400,000 kHz	3.55 GHz 3,550 MHz 3,550,000 kHz	DDR5-4800	360 W 360,000 mW 0.483 hp 0.36 kW	10 November 2022	$ 11,805.00 € 10,624.50 £ 9,562.05 ¥ 1,219,810.65	100-100000789, 100-100000789WOF
Count: 24

Designers

Mike Clark(?), chief architect

Bibliography

References

↑ "Processor Programming Reference (PPR) for AMD Family 19h Models 10h, Revision A0 Processors", AMD Publ. #55901, Rev. 0.97, May 30, 2021

codename	Zen 4 +
designer	AMD +
full page name	amd/microarchitectures/zen 4 +
instance of	microarchitecture +
manufacturer	TSMC +
microarchitecture type	CPU +
name	Zen 4 +

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