When choosing a motherboard for your Ryzen CPU, you'll find options like X870, B650, A620, and the new B850 and B840. This guide explains the chipset differences, PCIe lane setups, and help you pick the right board.
Guide to AMD Ryzen AM5 Motherboard Chipsets
- Thread starter Amir Shoam
- Start date
X870E = X670E + USB 4
X870 = B650E + USB 4
Yiiirh
X870 = B650E + USB 4
Yiiirh
Lots of this doesn't sound right. The chipsets, even x870e, don't support pci5 but the processor does?
The marketing focus for PCIe 5 appears to be on storage devices since those are some of the only PCIe 5 devices currently available.
Mr Majestyk
Posts: 2,420 +2,251
They haven't done a good job of explaining this.
The CPU itself has pcie lanes, with a few dedicated to Pcie5. The boards that support this will directly pass through those pcie lanes to the primary graphics card slot and the one or two dedicated m.2 slots. This is explained in the first paragraph just below the table.
The board chipset/s connect through pcie to the CPU. So any MB controlled pcie devices will be limited by that pcie link.
Hope that makes it clearer for you.
hahahanoobs
Posts: 5,565 +3,347
First column after 870E says: Graphics - 1x16 or 2x8 PCIe 5.0
Added cost for traces on boards to keep PCIe 5.0 signal integrity. Usually also requiring more PCB layers. It's not just a CPU thing.
You are missing the point of my response to the other user, in which I was giving more general terms for their understanding - they didn't understand that the CPU directly controls some of the pcie lanes while the rest is handled by the mobo chipset.
Not really. Price is close to identical where I am and improvements exist outside of the chipset. USB 4, WiFi 7, better NICs, better audio, better support for new CPUs, as in you don't need to flash firmware with USB before it will boot a 9000 series chip and more.
johnsonlam.hk
Posts: 24 +11
Not sure how the "youngsters" think, but I'm really tired of the powerful hardware, just good enough to work is fine, so I guess the middle price market will be better. Most important is stable, 1000ms slower usually just a blink of an eye.
No-one is forcing you to buy high-end stuff?
You are tired of powerful hardware but visits a hardware forum? Do you also hate fishing but visit a fishing forum?
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Here in Australia the prices are pretty much as Mr Majestyk highlights.
For example, you could buy a Asus ROG Strix B650E-I for $529 (https://www.scorptec.com.au/product/motherboards/amd-socket-am5/99999-rog-strix-b650e-I-gaming-wifi), while the new Asus ROG Strix X870-I for $899 (https://www.scorptec.com.au/product/motherboards/amd-socket-am5/113341-rog-strix-x870-I-gaming-wifi), that's a $370 dollar difference.
You can argue you're getting newer standards with USB 4 and WiFi 7, and higher speed RAM support, but you're paying a premium for them.
The above boards share the same NIC, so no extra value there. The newer board does get an improved DAC.
As for not needing to flash firmware to run a 9000 series CPU, there is absolutely no value in paying extra for this. Any competent PC builder should know how to do this, and if you're buying pre-built, they usually cover this anyway.
Australia is usually overpriced yeah? Also ITX for AM5 has been overpriced since day one + Asus premium tax, while they don't even make good AMD boards.
Here in EU, prices are pretty similar and as soon as 600 series boards sells out, price will drop the last 10%
I will gladly pay 10% more to get WiFi7, better NIC, USB 4, no hassle with flashing before system will boot etc.
If B650E was 25% cheaper then maybe I would consider it - It is not where I am. X870 is close to B650E pricing but I could see some black friday sales on the 600 series boards coming making them relevant again.
Gastec
Posts: 587 +307
hahahanoobs
Posts: 5,565 +3,347
His response:
The chipsets, even x870e, don't support pci5 but the processor does?
First column has his answer.
My response to you, and him if he reads it, explains how the gen 5 lanes can't be used on the CPU without support from the board as well.
But they didn't understand the first part in the first place, hence their query. You're and my understanding that you possible can have direct pcie lanes from the CPU helps us easily interpret that first column. If they don't understand that, it's logical to assume it's all handled by the MB chip. Which is why I said the article doesn't explains this well.
hahahanoobs
Posts: 5,565 +3,347
I wouldn't blame the article. Gen 5 hardware has been out for a while now.
Dude is just really far behind. Blaming an article now would be silly when there is an entire internet full of data to catch up on.
PierreJG
Posts: 46 +13
If you are a started an A620 will be fine but personally I would only use A X20 series for an APU. My work pc are a 4650g on an A320 mobo. That is still fine, Yes I can go for an 5600x but the question is would I? Personally I wouldn't as it has Horrible VRM. Not sure about the A620 as I never had a client order one yet (At the moment AMD are a really bad deal as even AM4 Ryzen 5 3500 is the same price as an I5 14th Gen here)
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I would, even constantly, if I were a content creatorDo you feel the need, the need for...adding drives?
Source?
The intention was probably that if you use four of the CPU's lanes for USB4, you are left with 24, but it's also possible for the USB4 controller to connect to both the CPU (for DisplayPort) and the chipset (for data transfer).
Helpful
USB4 have no effect on PCIe lanes from CPU. Just because there is no USB4 controller on CPU.
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