Help understanding B350 PCIe configuration

Hello Everyone,

Glad to be a part of this wonderful community.

I have a query about the a PC which I recently built based on the new AMD Ryzen Processor and AM4 B350 chipset. I am currently using a RX 480 graphics card and intend to buy a second (probably RX 580) in the near future to setup a crossfire.

As I was reviewing the motherboard user manual, I got confused with the PCIe configuration, bandwidth & speeds when using a second card.

Can someone please help me decipher the documentation so that I can make a smarter decision regarding crossfire ?

The board that I am using in my PC is an Asus Prime B350-Plus

A summary of the PCIe configuration that I could get from the manual is as follows:





I would like to know the following:

1. At what speed would the second card run and any potential performance impacts ?
2. Would I lose the use of any other slots/ports on my motherboard if I crossfire ?

Thanks in advance.

Regards,
Rajiv
2 answers Last reply
More about understanding b350 pcie configuration
  1. 1) PCIe 2.0 x4

    2) PCIeX16_2 slot shares bandwidth with PCIeX1_1 and PCIeX1_2. If those slots are used the speed will be slower. A PCIe 2.0 speed would be a maximum of 10.0 Gb/s for two PCIe 2.0 lanes.
  2. Calvin7 said:
    1) PCIe 2.0 x4

    2) PCIeX16_2 slot shares bandwidth with PCIeX1_1 and PCIeX1_2. If those slots are used the speed will be slower. A PCIe 2.0 speed would be a maximum of 10.0 Gb/s for two PCIe 2.0 lanes.


    Hi,

    Thanks for summarizing it for me, makes more sense now.

    As it is clearer, does it make sense for me to crossfire on this motherboard or should I probably look to upgrade to a X370 chipset in the future for crossfire ?

    I will be using my current RX 480 in this slot and would ensure that I do not use PCIeX1_1 and PCIeX1_2. Would there be a performance impact because of the PCIe bandwidth bottleneck in the second slot?

    Regards,
    Rajiv
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