AMD B550 Motherboards With PCIe 4.0 Should Still Be Easy on Wallets

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By Zhiye Liu
last updated

The cheapest ticket to PCIe 4.0

Asus ROG Strix B450-F Gaming

Asus ROG Strix B450-F Gaming (Image credit: Asus)

AMD B550 motherboards will be available starting June 16, 2020. Retailers should be stocking their shelves by now, and some have already posted the new motherboards on their online stores. Hardware investigator @momomo_us spotted some B550 listings from Interconnect IT Solutions, a distributor in Australia.

Keep in mind that we should take preliminary listings with a healthy dose of salt, since some retailers commonly use placeholders for upcoming products, while others randomly fabricate prices.

The Australian retailer posted the Asus ROG Strix B550-F Gaming (Wi-Fi), Asus TUF Gaming B550M-Plus (Wi-Fi) and Asus Prime B550M-A all with the same price tag. Given the different tiers in which the motherboard compete, it's extremely unlikely that Asus would price the trio identically.

The B550 motherboard prices are listed in Australian dollars and include GST (goods and services tax). The GST in Australia is 10% for the the majority of products and services that are consumed in the country. For easy reference, we've deducted the GST from the prices and converted them to U.S. dollars.

Swipe to scroll horizontally
MotherboardPricingB450 AU PricingB450 U.S. Pricing
Asus ROG Strix B550-F Gaming (Wi-Fi)$153.14$185.13$129.99
Asus TUF Gaming B550M-Plus (Wi-Fi)$153.14$133.89$89.99
Asus Prime B550M-A$153.14$114.67$116.34

For reference, the ROG Strix B450-F Gaming and TUF B450M-Plus Gaming currently retail for $129.99 and $89.99, respectively, in the U.S. Let's look at the panorama from two different angles.

If Interconnect IT Solutions' price corresponds to the ROG Strix B550-F Gaming (Wi-Fi), we're looking at an increase of roughly 17.8%. If it's for the TUF Gaming B550M-Plus (Wi-Fi), then the difference jumps to 70.2%. The first scenario is likely more accurate, since a 70% price inflation is very high and absurd.

AMD B550 motherboards should usher in PCIe 4.0 support for budget builders. PCIe 4.0 requires motherboard traces with wider spacing in comparison to PCIe 3.0. While you can carry a PCIe 3.0 signal on a single PCB layer, you need need at least six layers for PCIe 4.0, which should make B550 motherboards cost a little bit than B450 offerings.

Depending on the brand and model, a B450 motherboard can cost from $70 to up to $200 for the best motherboards in this category. Even if the B450 boards were around $150, it'd be a hard sell, considering that AMD X570 motherboards are going for a low as $160 with more premium features. 

Zhiye Liu
Zhiye Liu
RAM Reviewer and News Editor

Zhiye Liu is a Freelance News Writer at Tom’s Hardware US. Although he loves everything that’s hardware, he has a soft spot for CPUs, GPUs, and RAM.

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8 Comments Comment from the forums
  • InvalidError
    Many 300-series and even more 400-series boards could handle PCIe 4.0 from the CPU perfectly fine until AMD decided to push microcode to disable it. There is effectively no reason for B550 boards to be any more expensive than B450 models other than the chipset cost and any additional improvements motherboard manufacturers may add on top. I'd like to see some real 6+2 phases VRM options.
    Reply
  • alextheblue
    InvalidError said:
    Many 300-series and even more 400-series boards could handle PCIe 4.0 from the CPU perfectly fine until AMD decided to push microcode to disable it. There is effectively no reason for B550 boards to be any more expensive than B450 models other than the chipset cost and any additional improvements motherboard manufacturers may add on top. I'd like to see some real 6+2 phases VRM options.
    From what I remember reading, there were concerns over real-world signal integrity in many boards that OEMs enabled 4.0 on. So AMD put the brakes on it, rather than risk having problems dumped in their lap. Of course no third parties tested speeds and error rates as compared to an X570 so who knows how widespread the issues were (or were not).

    As far as VRM options go, I'd like to see them go even higher and undercut the entry-level X570 boards by $10-20, while matching in power delivery. But I admit it's not very likely. Side note, stock of decent AM4 motherboards seems to be getting slim, at least at last month's pricing. I hope supply loosens up soon.
    Reply
  • InvalidError
    alextheblue said:
    As far as VRM options go, I'd like to see them go even higher and undercut the entry-level X570 boards by $10-20, while matching in power delivery.
    You already got that: the lowest-end X-series motherboards have the same fat (double-FET) 4+2 phases commonly found on A/B-series motherboards, real 6+2 would be an improvement for those too. Some boards already have doubled-up drivers and chokes too. In those cases, the only real added cost is ~$1 for the controller upgrade a good chunk of which canceled out from removing 1/4 of the doubled quad.
    Reply
  • nofanneeded
    AMD or Intel , both are sneaky and ugly ... milking people for high end motherboards for options 99% wont use just to milk $$$ out of them. I hate this.
    Reply
  • alextheblue
    InvalidError said:
    You already got that: the lowest-end X-series motherboards have the same fat (double-FET) 4+2 phases commonly found on A/B-series motherboards, real 6+2 would be an improvement for those too. Some boards already have doubled-up drivers and chokes too. In those cases, the only real added cost is ~$1 for the controller upgrade a good chunk of which canceled out from removing 1/4 of the doubled quad.
    You're saying a native 6+2 would deliver more power than an equivalent doubled 4 + 2?
    Reply
  • InvalidError
    alextheblue said:
    You're saying a native 6+2 would deliver more power than an equivalent doubled 4 + 2?
    One major problem with doubling FETs is that they will practically never be perfectly matched in on-resistance, temperature, switching speed, etc. and all of these increase losses. If each switching pair has its own inductor, cross-conduction losses can be reduced but the current mismatch between the two phase halves will increase and at this point, you practically have all the components necessary for 8+2 apart from the VRM controller.

    A good 6+2 design can easily beat a crappy 4+2. It isn't only about power, a real 6+2 would have less ripple and faster transient response too, which means less power likely to be required to maintain stability. You may only have six transistor pairs instead of eight, but current will be more evenly matched across all of them. Each choke will have 1/6th of the current passing through them instead of 1/4 (non-doubled chokes), which will reduce choke losses by ~50%. Also, you can take the budget from cutting 25% of the fat-quad's FETs on better FETs and support circuitry for the remaining six pairs, more efficiency gains there.

    There are quite a few benefits to going real-6 over fat-4. The only downsides I can think of is $1 extra for the controller and two extra $0.10 chokes. I'm not a fan of overkill VRMs but fat-4 is getting old even for the entry-level, wouldn't mind paying $3 extra for real-6 on B550.
    Reply
  • nervousstate
    InvalidError said:
    Many 300-series and even more 400-series boards could handle PCIe 4.0 from the CPU perfectly fine until AMD decided to push microcode to disable it. There is effectively no reason for B550 boards to be any more expensive than B450 models other than the chipset cost and any additional improvements motherboard manufacturers may add on top. I'd like to see some real 6+2 phases VRM options.
    The PCB quality of B450 board was not high enough to meet the SNR Requirements of the PCIe 4.0 - Increase the PCB quality is a cost so that's reason one. Also B450 Boards have been on the market for a long time, so the cost of production was calculated in a Pre-COVID19 world and have simply been in inventory for the most part. Supply chain cost has increased and thus resulting product cost will increase. Also there is an initial release price and a price after 3 years of shelf life
    Reply
  • HeyThatsIllegal
    These prices for B550 seem way too high
    Reply