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rorystewart
Journeyman III

Does B550A chipset support PCIe4 and Smart Access Memory?

Hi - hoping someone can help me. I'd like to buy a new Zen 3 Alienware desktop (5600x and 6800 XT). But their website says the Aurora R10 comes with a B550A chipset (motherboard). 
 
1. Does this motherboard have PCIe 4.0 x4 M.2 slot for SSDs and PCIe 4.0 x16 slot for GPUs? 
2. Does this motherboard support AMD Smart Access Memory for Ryzen 5000 series CPUs and RX 6000 series GPUs?
 
The reason I am concerned is I looked online and reports say the B550A is just a rebranded B450 motherboard for OEMs. And unfortunately the B450 motherboard does not support PCIe 4.0 for GPU or SSD, nor does it support AMD's Smart Access Memory. Only the true B550 chipset supports PCIe4 and Smart Access Memory. 
 
Can someone verify my concerns for me? Dell is zero help - they cannot answer my question. 
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4 Replies
ultimodeiramas
Journeyman III

Re: Does B550A chipset support PCIe4 and Smart Access Memory?

Hi

I was wondering the same. Did you happen to find an answer?Thanks

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Thanny
Miniboss

Re: Does B550A chipset support PCIe4 and Smart Access Memory?

The first x16 slot will support PCIe 4.0, and the first M.2 slot might as well.  You'd need an expensive SSD for the latter to make a difference.

As for SAM (i.e. resizable BAR), I'm afraid I can't answer, because I don't know. The only thing AMD has said is "500 series" chipsets.  One could reasonably expect B550A to be included in that, but as well all know, it's actually B450 with PCIe 4.0 enabled.  Is SAM supported as is?  Does it need a BIOS update?  Does it need a BIOS update after AMD officially gives up on the silly idea of restricting SAM to Ryzen 5000 with 500 series chipsets?  All questions which don't seem to have any firm answers published where I can find them.

If I were forced to guess, I'd say the Dell machine won't have an option in the BIOS to turn on resizable BAR, so won't work with SAM, at least for now.

Maybe someone who actually owns such a machine with the 6800 XT can provide a definitive answer.

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RomatebitegeL
Adept II

Re: Does B550A chipset support PCIe4 and Smart Access Memory?

You can always send an email to the manufacturer and ask them these questions as well.

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elstaci
MVP

Re: Does B550A chipset support PCIe4 and Smart Access Memory?

Your PC uses a DELL OEM B550A Motherboard so the best suggestion is to ask DELL SUPPORT and see if it supports SAM Feature with the 5xxx Series CPUs.

According to this Tom's Hardware review of Alienware Aurora Ryzen Edition R10 Gaming Desktop, the Motherboard uses X570 Chipset: https://www.tomshardware.com/reviews/alienware-aurora-r10-ryzen-edition

Screenshot 2021-01-24 100731.png

But this is probably not the Alienware Aurora R10 Model that you have. So it is best to open a DELL SUPPORT CHAT and find out if your OEM motherboard will support SAM with the 5xxx series CPUs.