AMD has officially lifted the lid on its latest entry-level chipset designed for its Zen 2-based Ryzen 3000 and 4000 processors, the A520 chipset. Following AMD's mid-tier B550 chipset launch a few months back, A520 brings up the bottom of AMD's now fully-modernized chipset stack, dialing down on things like PCIe speeds to allow its board partners to build more budget-friendly Ryzen 3000/4000 motherboards.

Overall, A520 offers up to twenty-six available PCIe 3.0 lanes available when paired with a Ryzen 3000 processor, with twenty of these coming directly from the CPU. And, wasting no time, numerous vendors, including ASUS, ASRock, GIGABYTE, MSI, and Biostar have already unveiled some of their entry-level A520 boards.

A520 Chipset, The A-Team For Value

The Zen 2 architecture, which is the foundation of AMD's latest Ryzen series of processors, has been its most popular series of processors to date. One of the marquee features of the B550 and X570 chipsets is PCIe 4.0, which, although it hasn't been fully utilized in devices like video cards and storage at present, it is still a popular feature that users hope will future-proof their systems for years to come. The A520 chipset, in turn, drops support for PCIe 4.0 speeds entirely in favor of PCIe 3.0, which is relatively easier to wire for and gives extra scope for the motherboard vendors to save costs compared to B550 and X570. The chipset officially represents AMD's now current-generation entry-level pathway, and as always, is based around AMD's AM4 socket.

Overall, the limitation in PCIe speeds for A520 is board-wide. Along with the chipset itself being limited to PCIe 3.0 support for both downstream and upstream, Ryzen processors will cap their on-chip PCIe lanes to PCIe 3.0 speeds when paired with an A520 motherboard. Further cutting PCIe-related costs, with A520 AMD offers less scope for lane allocation compared to B550 and X570, which allows vendors reduce the number of components required. There are only a couple of avenues in which vendors can configure their boards, such as selecting between using two PCIe 3.0 x1 slots or two SATA ports. 

Meanwhile, A520 also supports a couple of different configuration options with the 4 high-speed storage lanes coming from the host CPU. This includes building a full-fledged PCIe 3.0 x4 M.2 slot, two PCIe 3.0 x2 M.2 slots, or a PCIe 3.0 x2 M.2 slot with two additional SATA ports.

  • CPU
    • x4 PCIe 3.0 NVMe
    • x2 PCIe 3.0 NVMe + 2 x SATA
    • x2 PCIe 3.0 NVMe + x2 PCIe 3.0 NVMe
  • Chipset
    • 4x PCIe 3.0 + 2x PCIe 3.0
    • 4x PCIe 3.0 + 2 SATA

The remaining PCIe lanes from the CPU, as always, are divided between a full-length PCIe 3.0 x16 slot, and a PCIe 3.0 x4 link between the CPU and the chipset.

As for USB connectivity, A520 offers support for up to four USB 3.2 G2 ports from the CPU. Meanwhile the chipset itself adds another USB 3.2 G2 port, two USB 3.2 G1 ports, and six USB 2.0 ports.

Processor Support

The A520 chipset has identical processor support to that of the mid-range B550 chipset, with official support for AMD's current Ryzen 3000 desktop processors as well as AMD's next-generation Ryzen 4000 processors. Like with the B550 chipset, some A520 boards come with video outputs, which all but confirms support for AMD's Ryzen 4000 APUs – especially seeing as how A520 doesn't officially support the earlier Ryzen 3000 or 2000 series APUs.

AMD AM4 Motherboard Support
AnandTech uArch A320 B350
X370
B450
X470
X570 B550
 
A520
Ryzen 4000 CPU Zen 3 X X Beta
Ryzen 4000 APU** Zen 2 X ?Beta
Ryzen 3000 CPU Zen 2 X Beta
Ryzen 3000 APU Zen+ X X
Ryzen 2000 CPU Zen+ X X
Ryzen 2000 APU Zen X X X
Ryzen 1000 CPU Zen X X X
Athlon A-Series * X X X X
Ryzen Pro CPUs follow their non-Pro equivalents
* Excavator or Carrizo
** Unknown - product not announced yet
 

The AMD Ryzen 3000 CPU stack starts at the Ryzen 3 3100 with four cores and eight threads, which is currently available for $99. This would be a very suitable processor to pair with an A520 motherboard, though more aspiring builders can use any of of the Ryzen 3000 desktop CPUs, including the goliath sixteen core Ryzen 9 3950X.

The Current A520 Motherboard Stack

Accompanying AMD's announcement of the A520 chipset, motherboard vendors have begun rolling out their respective A520 boards. The main form factor of choice for A520 thus far is Micro-ATX, with a couple of Mini-ITX boards including the ASRock A520M ITX/ac and the GIGABYTE A520I AC. Gigabyte also has the only full-sized ATX model announced so far, which is the GIGABYTE A520 Aorus Elite.


The GIGABYTE A520 Aorus Elite ATX Motherboard

A520 boards set to hit the market include some gaming themed models that primarily come from GIGABYTE with its Aorus models, as well as the ASUS TUF Gaming A520M-Plus. The solitary offering from Biostar is aimed at business and casual users with its A520MH V6.0.

The most feature-packed A520 model looks to be the GIGABYTE A520 Aorus Elite with four memory slots that support up to 128 GB of DDR4-4400 memory, a Realtek ALC1200 HD audio codec and an unspecified Realtek Gigabit Ethernet controller. It has two full-length PCIe 3.0 slots that operate at x16/x2, with three PCIe 3.0 x1 slots and a single PCIe 3.0 x4 M.2 slots with four SATA ports.

Announced AMD A520 Models (08/18)
Model Size
ASRock A520M Pro M-ATX
ASRock A520M ITX/ac M-ITX
   
ASUS Prime A520M-K M-ATX
ASUS Prime A520M-A M-ATX
ASUS TUF Gaming A520M-Plus M-ATX
   
Biostar A520MH V6.0 M-ATX
   
GIGABYTE A520M DS3H AC M-ATX
GIGABYTE A520M DS3H M-ATX
GIGABYTE A520 Aorus Elite ATX
GIGABYTE A520M Aorus Elite M-ATX
GIGABYTE A520I AC M-ITX
GIGABYTE A520M H M-ATX
GIGABYTE A520M S2H M-ATX
   
MSI A520M-A Pro M-ATX
MSI A520M Pro-C Dash M-ATX
MSI A520M Pro M-ATX
MSI A520M Vector WIFI M-ATX

At present, we don't have MSRP pricing from any of the vendors, but we have reached out to each vendor individually, and we will update the above chart once we have the official pricing. It is likely that the vast majority of A520 boards will be below $150 due to B550 models starting at that price point. The A520 chipset is its most basic entry-level chipset for Ryzen 3000 processors.

Finally, today's A520 release is a hard launch, with Newegg and other retailers already offering boards for sale. Not every board vendor has their wares on shelves just yet – as is usually the case for low-end board launches, this is a very relaxed launch – but over the coming days and weeks we should see the remainder of the A520s trickle into retail shops.

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  • Retycint - Wednesday, August 19, 2020 - link

    Exactly. 2x16GB sticks can be had for as low as $100-120 nowadays, no reason to chase 4 slots and add unnecessary cost. Reply
  • MrSpadge - Wednesday, August 19, 2020 - link

    Because adding those slots should cost <1$ now. But buying 2x8 GB now instad of 2x16 GB saves 50-60$. Should later on the need for more RAM arise, the prices are likely to be lower than now. Reply
  • Retycint - Wednesday, August 19, 2020 - link

    It's not about the cost of adding things. It's about market segmentation, and manufacturers have to use things like IO and slot availability to segment. Why do cheap laptops have terrible TN screens when a better LCD panel only costs $10-30 more? Why do they come with terrible and mushy trackpads when high quality trackpads don't cost that much? Segmentation, because otherwise nobody would buy their premium laptops. Same here. If manufacturers started putting 4 RAM slots and decent IO options on even their lowest end boards, then there goes 2 reasons to buy premium boards and they make less money

    All things considered, limiting to 2 RAM slots isn't really a big compromise.
    Reply
  • dotjaz - Sunday, August 23, 2020 - link

    You are dreming. 2xDIMMs plus the extra wiring/traces required cost more than $1. With such low end product you wouldn't need more RAM anytime soon, by the time you need beyond 16GB, you don't want to mix and match RAM with Ryzen.

    If you absolutely have to have 4 DIMMs, then this isn't for you, stay away.
    Reply
  • PandaBear - Thursday, August 20, 2020 - link

    Maybe I'm old school. Back when I build PC they were expensive ram that we expect price drop once in a while due to Moore's law. These days the same memory stay the same price for 3 years and you don't really upgrade because the price drop is minimal, and you need to slow down your ram when you use more than 2 sticks. So yeah I see where this is going, no point in 4 dimms anymore. Reply
  • dotjaz - Sunday, August 23, 2020 - link

    4 DIMMs are just useless on such low end products, 2x8GB is far more stable and good for another 3-5 years at least, with Ryzen you don't want to mix and match RAM, so by the time 16GB isn't enough, you'll want to just upgrade to 2x16GB.

    Having only WiFi5 is cheaping out.
    Reply
  • nathanddrews - Tuesday, August 18, 2020 - link

    I thought desktop 4000-series CPUs (not desktop 4000-series APUs) were Zen 3, requiring a new socket? Reply
  • Koenig168 - Tuesday, August 18, 2020 - link

    Ryzen 4000 is still AM4. The next socket change is with Ryzen 5000. Reply
  • Ryan Smith - Tuesday, August 18, 2020 - link

    Zen 3 is already confirmed for AM4.

    https://images.anandtech.com/doci/15774/Ryzen%203_...

    https://www.anandtech.com/show/15807/amd-to-suppor...
    Reply
  • GreenReaper - Wednesday, August 19, 2020 - link

    I wonder how long it will be until some enterprising hacker figures out a way to unlock PCIe 4.0 on it. Reply

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