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PCIe Gen5 Switch vs new MB

BACKGROUND
2 SIGNALSFIRST DETECTED 29 May 2026
Narrative synthesis pending — 2 signals collected.
How the story developed
16 Sept
Is an X399 rig still viable?
OPINION · WHAT · LocalLLaMA
29 May
PCIe Gen5 Switch vs new MB
OPINION · WHAT · LocalLLaMA
Other feeds and industry voices
24 Apr
Is an X399 build still viable?

<!-- SC_OFF --><div class="md"><p>Just happened across a local seller with the following setup:</p> <p>GPU - 2x RTX 3090</p> <p>CPU - ThreadRipper 2950X 16 core</p> <p>Motherboard

OPINION · WHAT · LocalLLaMAOPEN STORY
13 Apr
Only 1 of 2 GPUs showing in nvidia-smi with PCIe bifurcation setup (2x 3060s + 5060 Ti)

<!-- SC_OFF --><div class="md"><p>Motherboard: Asus x370 Taichi</p> <p>PCIE1: PCIe 3.0 x16 (runs at x16 single, or x8 when PCIE3 is also populated)</p> <p>PCIE2: PCIe 3.0 x16

OPINION · WHEN · LocalLLaMAOPEN STORY
30 Jun
Is there an alternative to C-Payne for 100-lane PCIe 5.0 switches? Needed for 8-GPU build.

<!-- SC_OFF --><div class="md"><p>Sadly C-Payne has gone dark and no longer responds to emails or the contact form, which is real shame because C-Payne gear is really good and

OPINION · WHAT · LocalLLaMAOPEN STORY
7 May
AMD Intros Instinct MI350P Accelerator: CDNA 4 Comes to PCIe Cards

<table> <tr><td> <a href="https://www.reddit.com/r/LocalLLaMA/comments/1t6b2x8/amd_intros_instinct_mi350p_accelerator_cdna_4/"> <img alt="AMD Intros Instinct MI350P Accelerator:

OPINION · WHAT · LocalLLaMAOPEN STORY
27 Mar
PCIe Bifurcation Issue

<!-- SC_OFF --><div class="md"><p>I thought you guys would be likely to know a direction for me to go on this issue. </p> <p>I have a cheap Frankenstein build, Lenovo p520 with

OPINION · WHAT · LocalLLaMAOPEN STORY
22 Mar
Attaching an extra GPU via pcie slot

<!-- SC_OFF --><div class="md"><p>Used to to do eth and other cryptomining where all attached GPUs with a 1x pcie cable, powered pcb adapter was sufficient as it was just data

OPINION · WHERE · LocalLLaMAOPEN STORY
16 Apr
Anyone got a problem with PCIe speeds and AMD MI-50 ?

<!-- SC_OFF --><div class="md"><p>So I got an MI-50 that I use for my local inference but I recently discovered that it is connected with PCIe 3 speeds to my motherboard. Even

OPINION · HOW · LocalLLaMAOPEN STORY
29 May
Best PCIE splitters?

<!-- SC_OFF --><div class="md"><p>Hey Local LLaMA,</p> <p>I’m looking to expand my rig and I was wondering if anyone had links to the best pcie splitters or affordable one’s that

OPINION · WHAT · LocalLLaMAOPEN STORY
Sources
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