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PCI lanes and rendering with AMD

spswaffordspswafford Posts: 179
in Technical Help (nuts n bolts)

Looking at the Ryzen and Threadripper series. Was wondering if someone has experience to say if more PCI lanes makes a difference for rendering. Ryzen has 24 and Threadripper has 64. If it doesn't make a difference, then no reason to spend extra money on Threadripper.

Comments

  • kenshaw011267kenshaw011267 Posts: 3,805

    Directly PCIE lanes don't really affect render time. However motherboard manufacturers tend to put more full length PCIE slots on boards with more lanes. You can TR$ MoBo's with 4 full length slots which in theory would let you build a rig with 4 double width graphic cards.

  • PadonePadone Posts: 3,796
    edited March 2019

    AFAIK pci lanes only affect out of core rendering.

    For normal rendering you can easily build a farm using risers from 1x to 16x and you will not notice any relevant slowdown. Of course the viewport card has to be at least 8x.

    Out of core rendering is another beast. The gpu has to access the ram quickly so 8x to 16x is recommended in any card involved with the process. Also a fast dual-quad channel ram helps.

    Post edited by Padone on
  • prixatprixat Posts: 1,590

    Another advantage to having more lanes is the ability to have more NVMe and PCIe based drives without them canibalising other features of the motherboard.

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