In March 2017, with the launch of its new Zen processors, AMD used the AM4 socket that they had previously used with their Bristol Ridge (derived fromExcavator) poweredAthlon X4 and some A-Series, apin grid array (PGA) socket that they promised to support until 2020.[6]
AtCES 2022, AMD CEOLisa Su unveiled the AM5 socket and the integratedheat spreader design for the upcoming Ryzen 7000 processors due in late 2022.
On May 23, 2022, AMD provided details about the AM5 socket, its correspondingmotherboards, and Ryzen 7000 Series CPUs atComputex inTaipei, Taiwan.[7] At Computex, motherboard vendorsASRock,Gigabyte and others debuted their new X670 motherboards featuring the AM5 socket.[8][9]
AMD stated that it plans to support the AM5 socket for a number of years as it did with the AM4 socket.[10] During the Ryzen 7000 series reveal on August 29, 2022, AMD confirmed that it would support the AM5 socket until at least 2025.[11] AtComputex 2024, AMD announced that this support period would then be extended through 2027.[12]
The AM5 socket specifies four holes for fastening the heatsink to the motherboard to be placed at the corners of a rectangle with a lateral length of 54×90 mm, as well as UNC #6-32 screw threads for the backplate, identical to those of the preceding AM4 socket. Furthermore, the Z-height of the CPU package is kept the same as that of AM4, for backward compatibility of heatsinks.[16]
Unlike AM4, the backplate on AM5 is not removable, as it also serves the purpose of securing the CPU retention mechanism for the LGA socket.[17]
Not all existing CPU coolers from AM4 are compatible. In particular, coolers that use their own backplate mounting hardware, instead of the default motherboard-provided backplate, will not work. Some cooler manufacturers are offering upgrade kits to allow incompatible older coolers to be used on AM5.[18][19]
The AM5 chipsets line-up had been criticised for being confusing due to chipsets with very similar prefixes (and tens-digit-place designation) having very different meanings between 600 and 800 series.[c][20]
The AM5 600 series chipsets were released alongside the release of Ryzen 7000 series desktop CPUs.
A620 / A620A – The most entry level 600 series chipset
B650 – Compared to A620: Added features making processor overclocking possible, chipset PCIe 4.0 support, and higher speeds USB 3.2 available
B650E – Compared to B650: Added support for PCIe 5.0 lanes coming from CPU. (Requires CPU also has PCIe 5.0 support)
X670/X670E uses 2 "Promontory 21" silicon by ASMedia. One of which connected to the CPU, and the second one daisy chained to the first one.
X670 – With the doubled chipset, the number of SATA ports, USB lanes, and chipset PCI lanes doubled (4 of PCIe 4.0 lanes used on connecting chipset) – compared to B650/B650E. However, PCIe 5.0 lanes connectivity from the CPU only has support to the M.2/GPP slot not to the primary x16 slot.
X670E – Added Primary PCIe x16 slot Gen 5 support compared to X670.
^More likely need a BIOS update if the motherboard was manufactured in a earlier date.
^Support for Gen5 speeds on lanes directly from CPU to expansion and M.2 slots, and general-purpose lanes. (Also depends on CPU PCIe support. Some CPUs have as low as 10 lanes of PCIe 4.0 available.)
^PCIe lanes provided by the chipset. The CPU provides other PCIe 5.0 and/or 4.0 lanes.
^abcdThe motherboard maker may configure the total of 6 USB 3.2 lanes provided by the chipset into "4× USB3.2 Gen 2x1 and 1× USB3.2 Gen 2x2" or "6× USB3.2 Gen 2x1 and 0× USB3.2 Gen 2x2" ports.
^abcdThe motherboard maker may configure the total of 12 USB 3.2 lanes provided by the chipset into one of the following: "8× USB3.2 Gen 2x1 and 2× USB3.2 Gen 2x2", "10× USB3.2 Gen 2x1 and 1× USB3.2 Gen 2x2", or "12× USB3.2 Gen 2x1 and 0× USB3.2 Gen 2x2"
^AMD did not mandate which Wi-Fi version should be paired with which chipset (unlike USB4 is mandatory with some chipsets). Motherboard makers may omit Wi-Fi on some models.
^abTwo Promontory 21 chipsets are present, each having a TDP of ~7 W, giving a total TDP of ~14 W.
^X670 and X870 would be considered having very similar names, based on naming of previous chipset generations, but X870 is mostly identical to B650E (not X670) in terms of architecture and features provided by the chipset itself.
