AMDAMD Ryzen 3000B550Motherboards

AMD X570 vs B550 vs B450 Chipset Comparison – Is PCIe 4.0 worth the additional cost?

The latest AMD Ryzen 3000 series has been out for a while now. However, the latest generation chipset available has only been the premium X570. Finally, this is set to change with the launch of the affordable gaming orientated B550 motherboards.

The X570 chipset launched with a massive price increase compared to the previous generation, while prices have come down a little, there is still a big premium to pay.

While it is possible to use the older X470 and B450 motherboard with the latest Ryzen CPUs, you would not get the benefit of PCIe 4.0 support. It is unlikely you will have missed out much by doing this as not much makes the most of the increased bandwidth PCIe 4.0, but this will eventually change.

Recently it was revealed that AMD would not support their up and coming Ryzen 4000 series on the older X470 and B450 which would have limited their appeal for anyone investing in a computer right now. However, AMD has now backtracked on this statement stating they will now support the new CPUs.

The reason for the lack of support wasn’t just AMD forcing you to upgrade, it was the limitation of the BIOS size not being able to support CPUs across 4 generations. So it is not completely clear how AMD are now going to bypass this limitation.

Anyway, that’s a problem for AMD to work out.

In the meantime, you still have the option of B450, X470, X570 and now the B550 for any new builds your are thinking of.

So what is the difference between the options?

PCIe 4.0

The big one is PCIe 4.0 support which offers double the bandwidth of PCIe 3.0, not much can use all that bandwidth at the moment, but that will change so investing in a PCIe 4.0 motherboard will give you a bit more longevity from your purchase.

In order to keep the cost of the B550 down, you get reduced PCIe 4 support. The PCIe Interface from the CPU will give you PCIe 4, but then the motherboard chipset will be PCIe 3.

The older B450 was similar in that it only offered PCIe 3 from the CPU and then PCIe 2 from the motherboard.

All the motherboards offer a total of 24 PCIe lanes.


SATA ports are not as important as they once were, with many preferring NVMe drives now, but if you are a data hoarder, then the X series motherboard offers an additional 2 SATA ports while the B450 and B550 offer 6 ports.

USB 3.1 

B450 lacks any support for USB 3.1 Gen2 which offers 10 Gbit/s data speeds vs  5 Gbit/s of the first-gen.

The B450 then has a maximum of just 6 USB 3.1 gen 1 ports.

For the X570 you have up to 8 ports capable of USB 3.1 Gen2 and 4 on Gen1

The B550 sits in between with 2 Gen2 and 6 Gen1


All B-series and up motherboards offer overclocking support. Generally, the X-series motherboard has more VRMs and better onboard cooling, so they theoretically offer better overclocking support.


Only ASUS so far has announced any pricing, with prices starting at $134 for the ASUS Prime B550M-A, all the way up to $279 for the ASUS ROG Strix B550-E Gaming.

What that translates to in the UK remains to be seen. However, on Newegg in the US the Asus ROG Strix B450-F Gaming is listed as $129.99 and the Strix X570-F was listed at $299.99 (both are out of stock though). The Prime B450M-A is just $79.99. Alternatively, the Prime X570-P is just $149.99.

In the UK you can pick up an MSI X570-A PRO for just £140.00 or the ASUS ROG Strix B450-F is £120. X470 motherboards seem to be in short supply now, with the MSI X470 Gaming Pro costing £134.27.

Depending on the launch price, the B550 motherboards may end up looking a little pointless. People looking for a bargain will be better off with B450 motherboards, while the X570 motherboards have become more affordable and likely worth the little extra over the B550.

This will, of course, change in a few months, we will likely see B450 stock diminish and the cost of B550 drop.

Comparison Table

X570 B550 B450
PCIe Interface from CPU 4.0 4.0 3.0
PCIe Interface from Chipset 4.0 3.0 2.0
Max PCH PCIe Lanes 24 24 24
USB 3.1 Gen2 8 2 0
Max USB 3.1 (Gen2/Gen1) 8/4 2/6 0/6
DDR4 Support 3200 ? 2667
Max SATA Ports 8 6 6
PCIe GPU Config x16
Memory Channels (Dual) 2/2 2/2 2/2
Integrated 802.11ac Wi-Fi MAC N N N
Chipset TDP 11W ?W 4.8W
Overclocking Support Y Y Y
XFR2/PB2 Support Y Y Y

Last Updated on

Last update on 2020-05-22 / Affiliate links / Images from Amazon Product Advertising API

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Maikel Du

I worked in many technical fields, but I always resort to blogging which has become an addiction to me
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