Socket AM4

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Socket AM4
AM4 socket.svg
ProcessorsRyzen: Athlon:
  • Raven Ridge
Bristol Ridge:
PredecessorAM3+, FM2+, AM1
Memory supportDDR4

This article is part of the CPU socket series

Socket AM4 is a microprocessor socket used by AMD's central processing units (CPUs) built on the Zen (including Zen+ and Zen 2) and Excavator microarchitectures.[1][2]

AM4 was launched in September 2016 and was designed to replace the sockets AM3+, FM2+ and FS1b as a single platform. It has 1331 pin slots and is the first from AMD to support DDR4-compatible memory as well as achieve unified compatibility between high-end CPUs (previously using Socket AM3+) and AMD's lower-end APUs (on various other sockets).[3][4]


The X370 chipset supports multiple graphics cards. But the number of available PCIe lanes depends on the CPU/APU.
  • Support for Zen (including Zen+ and Zen 2) based family of CPUs and APUs (Ryzen, Athlon), as well as for some A-Series APUs and Athlon X4 CPUs (Bristol Ridge based on the Excavator microarchitecture)
  • Supports PCIe 3.0[5] and 4.0[6]
  • Supports up to 4 modules of DDR4 SDRAM[5] in dual-channel configuration


The AM4 socket specifies the 4 holes for fastening the heatsink to the motherboard to be placed in the corners of a rectangle with a lateral length of 54×90 mm. Previous sockets have 48×96 mm.

Some heat sinks for older sockets are not compatible.[7][8] However, some cooler manufacturers are reported to be offering brackets allowing previously manufactured coolers to work with AM4,[9] while other coolers will be redesigned.[10][11] Alternatively, some motherboard makers are including both AM3 and AM4 cooler mounting holes, allowing previous generation coolers to be used.[12]


Socket AM4 is currently a base for 6 chipset models. While the processors for this socket have been designed as systems on a chip (SoC), with the traditional northbridge and southbridge on board the processor, the motherboard chipset will increase the number of PCI Express lanes and other connectivity options. These connectivity options include: NVMe, SATA, and USB 3.2 Gen 2.[2][11][13]

There are currently 3 generations of AM4-based chipsets on the market. Models beginning with the number "3" are representatives of the first generation, with the number "4" — the second generation, etc.

Individual chipset models differ in comparison to each other, among others, in the number of PCI Express lanes, USB ports, SATA connectors, as well as supported technologies. The table below shows these differences.[14][15][16]

Model Release Date PCI Express (PCIe) USB:
3.2 Gen 2 + 3.2 Gen 1 + 2.0
SATA + SATA Express[a] RAID StoreMI PBO Processor overclocking TDP Market segment CPU support[17]
Chipset PCIe lanes[b] CrossFire SLI Zen Zen+ Zen 2
X570 2019 July[18] PCIe 4.0 ×16 Yes Yes 8 + 0 + 4 12 0, 1, 10 Yes Yes Yes ~11 W[19][20] Performance / Enthusiast No Yes Yes
X470 2018 March[21] PCIe 2.0 ×8 2 + 6 + 6 4 + 2 ~5 W[22] Yes
X370 2017 February[23] No No Beta[c]
B450 2018 March[21] PCIe 2.0 ×6 No 2 + 2 + 6 2 + 1 Yes Yes Mainstream Yes
B350 2017 February[23] No No Beta[c]
A320 2017 February[23] PCIe 2.0 ×4 No 1 + 2 + 6 No Entry level No/Beta, depending
on mainboard
BIOS updates
  1. ^ Each SATA Express port can be divided into 2 SATA ports.
  2. ^ PCIe lanes provided by the chipset. The CPU provides other PCIe 3.0 or 4.0 lanes.
  3. ^ a b Selective Beta BIOS update needed

The 300 and 400 series Chipsets are designed in collaboration with ASMedia.[24] The X570 is designed by AMD with IP licensed from ASMedia and other companies.[25] Network interface controller, Wi-Fi, and Bluetooth are provided by external chips connected to the chipset through PCIe or USB. All 300/400 series chipsets are made using 55 nm lithography.[26]

See also[edit]


  1. ^ Tyson, Mark (5 September 2016). "7th Generation AMD A-Series desktop PC systems start to ship". Hexus. Retrieved 5 September 2016.
  2. ^ a b Mah Ung, Gordon (5 September 2016). "AMD's new Bristol Ridge processor is faster and more power efficient". PC World. Retrieved 5 September 2016.
  3. ^ "AMD's 2016-2017 x86 Roadmap: Zen Is In, Skybridge Is Out". Retrieved 2015-06-19.
  4. ^ MujtabaHassan, Hassan (2015-05-07). "AMD Confirms x86 Zen Based Enthusiast FX CPUs and 7th Generation APUs in 2016 - Compatible With AM4 Socket". WCCFtech. Retrieved 2016-09-16.
  5. ^ a b Moammer, Khalid. "AMD Zen CPU & AM4 Socket Pictured – PGA Design With 1331 Pins Confirmed". WCCFtech. Retrieved 2016-09-16.
  6. ^ "The Industry Leading AMD AM4 X570 Chipset". AMD Community. 2019-05-26. Retrieved 2019-06-10.
  7. ^ Peak, Sebastian (19 September 2016). "AMD's Upcoming Socket AM4 Pictured with 1331 Pins". PC Perspective. Retrieved 21 September 2016.
  8. ^ "Report: AMD Socket AM4 Compatible with Existing AM2/AM3 Coolers | PC Perspective".
  9. ^ Killian, Zak (25 January 2017). "CPU heatsink makers ready up Socket AM4 mounting kits". Tech Report. Retrieved 25 January 2017.
  10. ^ Chacos, Brad (4 January 2016). "AMD reveals an army of Ryzen PCs and AM4 motherboards". PC World. Retrieved 10 January 2017.
  11. ^ a b Walrath, Josh (7 January 2016). "AMD Details AM4 Chipsets and Upcoming Motherboards". PC Perspective. Retrieved 10 January 2017.
  12. ^ Cutress, Ian (2 March 2017). "The AMD Zen and Ryzen 7 Review". Anandtech. Retrieved 2 March 2017.
  13. ^ Cutress, Ian (13 December 2016). "AMD Gives More Zen Details". Anandtech. Retrieved 13 December 2016.
  14. ^ "AMD Socket AM4 Platform". AMD. Retrieved 2019-06-10.
  15. ^ "AMD Socket AM4 Platform". AMD. Archived from the original on 2019-04-04. Retrieved 2019-06-10.
  16. ^ "Socket AM4 X570 Motherboards". AMD. Retrieved 2019-06-10.
  17. ^ Hassan Mujtaba (2019-05-27). "AMD X570 Motherboard Roundup – Featuring X570 AORUS Xtreme, ASRock X570 Taichi, MSI MEG X570 GODLIKE, ASUS Crosshair VIII HERO & More". wccftech. Retrieved 2019-07-10. slide
  18. ^ CrimsonRayne (2018-12-01). "AMD X570 Launches at Computex & Supports PCIE 4.0 | Ryzen 3000 Series Launch Date Leaked?". redgamingtech. Retrieved 2019-07-10. the X570 platform is targeting a release of Computex 2019, which takes place between May 28th and June 1st.
  19. ^ Gavin Bonshor (2019-05-26). "AMD Reveals the X570 Chipset: PCIe 4.0 is Here". AnandTech. Retrieved 2019-06-10. One of the caveats to a more powerful chipset is that it draws around 11 W of power.
  20. ^
  21. ^ a b Jacob Ridley (2018-01-05). "AMD's 12nm Ryzen 2 expected to launch in March alongside X470 and B450 chipsets". PCGamesN. Retrieved 2019-07-10.
  22. ^ Ian Cutress (2016-09-23). "The Two Main Chipsets: B350 and A320". AnandTech. Retrieved 2019-06-15.
  23. ^ a b c Khalid Moammer (2017-02-13). "AMD Ryzen X370 & B350 ASUS Motherboards Leaked – Launching February 24th". wccftech. Retrieved 2019-07-10.
  24. ^ Ian Cutress (2017-03-02). "Making AMD Tick: A Very Zen Interview with Dr. Lisa Su, CEO". AnandTech. Retrieved 2019-06-10.
  25. ^ Gavin Bonshor. "AMD Reveals the X570 Chipset: PCIe 4.0 is Here". AnandTech. Retrieved 2019-06-10.
  26. ^ Ian Cutress (2017-03-02). "Making AMD Tick: A Very Zen Interview with Dr. Lisa Su, CEO". AnandTech. Retrieved 2019-06-10. Q6: It has been noted that AMD has been working with ASMedia on the chipset side of the platform, using a 55nm PCIe 3.0x4 based chipset.