Editing amd/microarchitectures/zen 3

{{amd title|Zen 3|arch}}
{{microarchitecture
|atype=CPU
|name=Zen 3
|designer=AMD
|manufacturer=TSMC
|manufacturer 2=GlobalFoundries
|introduction=October 8, 2020
|process=7nm
|cores=64
|cores 2=56
|cores 3=48
|cores 4=32
|cores 5=28
|cores 6=24
|cores 7=16
|cores 8=12
|cores 9=8
|cores 10=6
|type=Superscalar
|oooe=Yes
|speculative=Yes
|renaming=Yes
|stages=19
|decode=4-way
|isa=x86-64
|extension=MOVBE
|extension 2=MMX
|extension 3=SSE
|extension 4=SSE2
|extension 5=SSE3
|extension 6=SSSE3
|extension 7=SSE4A
|extension 8=SSE4.1
|extension 9=SSE4.2
|extension 10=POPCNT
|extension 11=AVX
|extension 12=AVX2
|extension 13=AES
|extension 14=PCLMUL
|extension 15=FSGSBASE
|extension 16=RDRND
|extension 17=FMA3
|extension 18=F16C
|extension 19=BMI
|extension 20=BMI2
|extension 21=RDSEED
|extension 22=ADCX
|extension 23=PREFETCHW
|extension 24=CLFLUSHOPT
|extension 25=XSAVE
|extension 26=SHA
|extension 27=UMIP
|extension 28=CLZERO
|predecessor=Zen 2
|predecessor link=amd/microarchitectures/zen 2
|successor=Zen 4
|successor link=amd/microarchitectures/zen 4
}}
'''Zen 3''' is a [[microarchitecture]] developed by [[AMD]] as a successor to {{\\|Zen 2}}. It was publicly released on October 8, 2020. Mainstream Desktop processors hit shelves on November 5, 2020.

== History ==
[[File:amd zen future roadmap.jpg|400px|right]]
Zen 3 was formally disclosed in a roadmap by Lisa Su, AMD's CEO, during AMD's Tech Day in February of 2017. Zen 3 will be the 3rd iteration of the {{\\|Zen}} microarchitecture. On Investor's Day in May 2017 Jim Anderson, AMD Senior Vice President, confirmed that Zen 3 is set to utilize [[7nm+ process]].

== Products ==
[[File:amd zen2-3 roadmap.png|400px|right]]
{{future information}}

{| class="wikitable"
|-
! Product Line !! Cores/Threads !! Target
|-
| EPYC 7003 "{{amd|Milan|l=core}}" || Up to 64/128 || High-end server [[multiprocessors]]
|-
| {{amd|Trento|l=core}}<!--s/a Milan page--> || ?/? || High-performance computing
|-
| {{amd|Genesis Peak|l=core}} || ?/? || Workstation & enthusiasts market processors
|-
| Ryzen 5000 "{{amd|Vermeer|l=core}}" || Up to 16/32 || Mainstream to high-end desktops & enthusiasts market processors
|-
| Ryzen 5000 APU "{{amd|Cezanne|l=core}}" || Up to 8/16 || Mainstream desktop & mobile processors with GPU
|}

== Process technology ==
Zen 3 is fabricated on [[TSMC]]'s [[7 nm process|7nm+ process]], the same process used in Zen 2 Refresh processors.

== Architecture ==

There is very limited information available about the architectural improvements of Zen 3.

=== Key changes from {{\\|Zen 2}} ===
* CCD
** Unified 8-core CCX (from 2x 4-Core CCX per CCD) 
** 32 MiB L3$ available equally to all cores in CCD.
*** Decreased L3 latency (~46 cycles, up from ~40 cycles)
* Core
** Higher [[IPC]] (AMD self-reported +19% IPC)
** Front-end
** Increased branch prediction bandwidth
*** "zero-bubble" branch prediction
*** L1 BTB doubled from 512 to 1024 entries
** Improved prefetching
** Improved µop cache
* Back-end
** Floating point unit:
*** FMA latency reduced by 1 cycle from 5 to 4.
*** Fifth and sixth dedicated execution ports added for floating point store and FP-to-int transfer, no longer sharing 2nd FADD port.
*** Unified scheduler split into 1 scheduler per FMA/FADD/transfer port set.
*** 256b VAES and VPCLMULDQ support for doubled AES and AES-GCM cryptographic throughput.
*** Hardware implementation of BMI2 PDEP/PEXT bit scatter/gather operations, compared to prior microcode emulation.
** Integer unit:
*** Integer physical register file increased from 180 to 192 entries
*** Issue increased from 7 (existing 4 ALU and 3 AGU) to 10 with 1 new dedicated branch execution port and 2 separated store data pathways.
*** Schedulers shared between pairs of ALU + AGU/branch ports instead of dedicated for each.
*** Instruction redundancy increased between ports for reduced bottlenecking on a wider variety of instruction streams.
*** 8/16/32/64 bit signed integer division/modulo latency improved from 17/22/30/46 cycles to 10/12/14/20. (Unsigned operations are ~1 cycle faster for some of both old/new cases.) Throughput improves proportionately.
** Load/store:
*** Load throughput increased from 2 to 3, if not 256b.
*** Store throughput increased from 1 to 2, if not 256b.
*** Store queue increase from 48 to 64 slots.
*** Page table walkers tripled from 2 to 6 for TLB miss handling.
{{expand list}}

=== New Instructions ===
Zen 3 introduced the following ISA enhancements:

* {{x86|VAES}} - 256-bit Vector AES instructions
** <code>VAESDEC</code> - AES Decryption Round
** <code>VAESDECLAST</code> - AES Last Decryption Round
** <code>VAESENC</code> - AES Encryption Round
** <code>VAESENCLAST</code> - AES Last Encryption Round
* <code>{{x86|VPCLMULQDQ}}</code> - 256-bit Vector Carry-Less Multiplication of Quadwords
* {{x86|PCID}} - Process Context Identifiers
** <code>{{x86|INVPCID}}</code> - Invalidate TLB entry(s) in a specified PCID
* {{x86|INVLPGB}} - Broadcast TLB flushing
** <code>INVLPGB</code> - Invalidate TLB entry(s) with broadcast to all processors
** <code>TLBSYNC</code> - Synchronize TLB invalidations
* {{x86|PKU}} - Memory Protection Keys for Users
** <code>RDPKRU</code> - Read Protection Key Rights
** <code>WRPKRU</code> - Write Protection Key Rights
* {{x86|CET|CET_SS}} - Control-flow Enforcement Technology / Shadow Stack
** <code>CLRSSBSY</code>, <code>INCSSP</code>, <code>RDSSP</code>, <code>RSTORSSP</code>, <code>SAVEPREVSSP</code>, <code>SETSSBSY</code>, <code>WRSS</code>, <code>WRUSS</code>
* {{x86|SME|SEV-SNP}} - 3rd generation Secure Encrypted Virtualization - Secure Nested Paging
** <code>PSMASH</code>, <code>PVALIDATE</code>, <code>RMPADJUST</code>, <code>RMPUPDATE</code>
* {{x86|PSFD}} - Predictive Store Forwarding Disable (Speculation Control MSR)<ref name="amd-psf">[https://www.amd.com/system/files/documents/security-analysis-predictive-store-forwarding.pdf "Security Analysis of AMD Predictive Store Forwarding"], March 2021</ref>

Sources:<ref name="amd-24593-apm2">{{cite techdoc|title=AMD64 Architecture Programmer's Manual Volume 2: System Programming|url=https://www.amd.com/system/files/TechDocs/24593.pdf|publ=AMD|pid=24593|rev=3.37|date=2021-03}}</ref><ref name="amd-24594-apm3">{{cite techdoc|title=AMD64 Architecture Programmer's Manual Volume 3: General-Purpose and System Instructions|url=https://www.amd.com/system/files/TechDocs/24594.pdf|publ=AMD|pid=24594|rev=3.32|date=2021-03}}</ref><ref name="amd-26568-apm4">{{cite techdoc|title=AMD64 Architecture Programmer's Manual Volume 4: 128-Bit and 256-Bit Media Instructions|url=https://www.amd.com/system/files/TechDocs/26568.pdf|publ=AMD|pid=26568|rev=3.24|date=2020-05}}</ref>

=== 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
** 4-5 cycles latency for Int
** 7-8 cycles latency for FP
** ECC
* L2 Cache:
** 512 KiB per core, 8-way set associative
** 64 B line size
** Write-back policy
** Inclusive of L1
** ≥ 12 cycles latency
** ECC
* L3 Cache:
** "{{amd|Milan|l=core}}": 32 MiB/CCX, up to 256 MiB total
** "{{amd|Vermeer|l=core}}": 32 MiB/CCX, up to 64 MiB total
** "{{amd|Cezanne|l=core}}": 16 MiB, 8 MiB usable on some SKUs
** Shared by all cores in the CCX, configurable<ref name="amd-56375-qos">{{cite techdoc|title=AMD64 Technology Platform Quality of Service Extensions|url=https://developer.amd.com/wp-content/resources/56375.pdf|publ=AMD|pid=56375|rev=1.02|date=2020-10}}</ref>
** 16-way set associative
** 64 B line size
** L2 [[victim cache]]
** Write-back policy
** 46 cycles average load-to-use latency
** ECC
** QoS Monitoring and Enforcement V2.0

==== Translation Lookaside Buffers ====
* ITLB
** 64 entry L1 TLB, fully associative, all page sizes
** 512 entry L2 TLB, 8-way set associative
*** 4-Kbyte and 2-Mbyte pages
** Parity protected
* DTLB
** 64 entry L1 TLB, fully associative, all page sizes
** 2,048 entry L2 TLB, 16-way set associative
*** 4-Kbyte and 2-Mbyte pages, PDEs to speed up table walks
** Parity protected

All caches and TLBs are competitively shared in multi-threaded mode.

==== System DRAM ====
* EPYC 7003 "{{amd|Milan|l=core}}":
** 8 channels per socket, up to 16 DIMMs, max. 4 TiB
** Up to PC4-25600L (DDR4-3200), ECC supported
** SR/DR RDIMM, 4R/8R LRDIMM, 3DS DIMM, NVDIMM-N
* Ryzen 5000 "{{amd|Vermeer|l=core}}":
** 2 channels, up to 4 DIMMs, max. 128 GiB
** Up to PC4-25600U (DDR4-3200 UDIMM), ECC supported
* Ryzen 5000 APU "{{amd|Cezanne|l=core}}":
** DDR4-3200 or LPDDR4-4266

Sources:<ref name="amd-56375-qos"/><ref name="amd-56665-sog-19h">{{cite techdoc|title=Software Optimization Guide for AMD Family 19h Processors (PUB)|url=https://www.amd.com/system/files/TechDocs/56665.zip|publ=AMD|pid=56665|rev=3.00|date=2020-11}}</ref><ref name="amd-55898-ppr-1901">{{cite techdoc|title=Preliminary Processor Programming Reference (PPR) for AMD Family 19h Model 01h, Revision B1 Processors|url=https://www.amd.com/system/files/TechDocs/55898_pub.zip|publ=AMD|pid=55898|rev=0.35|date=2021-02-05}}</ref>

== All Zen 3 Chips ==

<!-- NOTE:
           This table is generated automatically from the data in the actual articles.
           If a microprocessor is missing from the list, an appropriate article for it needs to be
           created and tagged accordingly.

           Missing a chip? please dump its name here: http://en.wikichip.org/wiki/WikiChip:wanted_chips
-->
{{comp table start}}
<table class="comptable sortable tc13 tc14 tc15 tc16 tc17 tc18 tc19">
{{comp table header|main|20:List of all Zen 3-based Processors}}
{{comp table header|main|12:Processor|4:Features}}
{{comp table header|cols|Price|Process|Launched|Family|Core|C|T|TDP|L3|Base|Turbo|Max Mem|SMT|SEV|SME|TSME}}
{{comp table header|lsep|25:[[Uniprocessors]]}}
{{#ask: [[Category:microprocessor models by amd]] [[instance of::microprocessor]] [[microarchitecture::Zen 3]] [[max cpu count::1]]
 |?full page name
 |?model number
 |?release price
 |?process
 |?first launched
 |?microprocessor family
 |?core name
 |?core count
 |?thread count
 |?tdp
 |?l3$ size
 |?base frequency#GHz
 |?turbo frequency#GHz
 |?max memory#GiB
 |?has simultaneous multithreading
 |?has amd secure encrypted virtualization technology
 |?has amd secure memory encryption technology
 |?has amd transparent secure memory encryption technology
 |format=template
 |template=proc table 3
 |userparam=18:15
 |mainlabel=-
 |valuesep=,
 |limit=100
}}
{{comp table header|lsep|25:[[Multiprocessors]] (dual-socket)}}
{{#ask: [[Category:microprocessor models by amd]] [[instance of::microprocessor]] [[microarchitecture::Zen 3]] [[max cpu count::>>1]]
 |?full page name
 |?model number
 |?release price
 |?process
 |?first launched
 |?microprocessor family
 |?core name
 |?core count
 |?thread count
 |?tdp
 |?l3$ size
 |?base frequency#GHz
 |?turbo frequency#GHz
 |?max memory#GiB
 |?has simultaneous multithreading
 |?has amd secure encrypted virtualization technology
 |?has amd secure memory encryption technology
 |?has amd transparent secure memory encryption technology
 |format=template
 |template=proc table 3
 |userparam=18:15
 |mainlabel=-
 |valuesep=,
 |limit=100
}}
{{comp table count|ask=[[Category:microprocessor models by amd]] [[instance of::microprocessor]] [[microarchitecture::Zen 3]]}}
</table>
{{comp table end}}

== Designers ==
* Mark Evers, Chief Architect

== Bibliography ==
* AMD 'Tech Day', February 22, 2017
* AMD 2017 Financial Analyst Day, May 16, 2017

== References ==
<references/>

== See Also ==
* AMD {{\\|Zen}}, {{\\|Zen 2}}
* Intel {{intel|Tigerlake|l=arch}}
* Read also: [https://www.anandtech.com/print/16214/amd-zen-3-ryzen-deep-dive-review-5950x-5900x-5800x-and-5700x-tested AMD Zen 3 Ryzen Deep Dive Review]
* Read here: [https://techmotherboard.com/best-zen-3-cpu/ AMD Zen 3 Reviews]
codename	Zen 3 +
core count	64 +, 56 +, 48 +, 32 +, 28 +, 24 +, 16 +, 12 +, 8 + and 6 +
designer	AMD +
first launched	October 8, 2020 +
full page name	amd/microarchitectures/zen 3 +
instance of	microarchitecture +
instruction set architecture	x86-64 +
manufacturer	TSMC + and GlobalFoundries +
microarchitecture type	CPU +
name	Zen 3 +
pipeline stages	19 +