[HN Gopher] Free interactive tool that shows you how PCIe lanes ...
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Free interactive tool that shows you how PCIe lanes work on
motherboards
Author : tagyro
Score : 109 points
Date : 2025-11-19 07:13 UTC (1 days ago)
(HTM) web link (mobomaps.com)
(TXT) w3m dump (mobomaps.com)
| sidewndr46 wrote:
| Wow, this is great! I don't know how they generate this but it's
| really impressive. One of the things that I've been surprised
| with is some older dual socket workstations have tons of PCI-E
| lanes, but none are hooked to the second CPU it seems
| nirav72 wrote:
| Nice! One suggestion - please add AM4 socket boards. With current
| memory prices, AM5 with DDR5 is becoming unattainable for some.
| DDR4 prices are rising as well. But not nearly as bad as DDR5.
| NedCode wrote:
| Legendary!
| asciii wrote:
| Warning: addicting site :)
| rao-v wrote:
| I've been struggling to find an AM5 board that can run three
| MI50s at 4x. This is perfect thank you.
|
| Him are you sure about some of the PCI slots? I think some marked
| as 4x get downgraded to 1x on these boards...
|
| Further edit - this maybe accurate - how are you getting this /
| confirming it?
| smcleod wrote:
| That is so incredibly useful, hardware vendors do such a bad job
| of properly advertising how many GPUs will actually work and with
| what combination of m.2 slots in use.
| mifreewil wrote:
| Very nice! Just a note (as the site says on bottom left side),
| this can vary depending on the CPU you use, would be nice to be
| able to select all different variations of supported CPUs as a
| future feature.
| tagyro wrote:
| For disclosure, this was created by "Ronin Wilde" -
| https://www.youtube.com/watch?v=cgdXj75VSMo
|
| I found it useful and thought others might also like it.
| throw7 wrote:
| I wish all manufacturers clearly gave info like this up front.
| AM4 boards would be nice.
| PunchyHamster wrote:
| Yeah my ASRock have nice map of the every lane and interface
| and where they are connected on the board. Especially important
| as some devices go thru second io expander
| matja wrote:
| How can I contribute the data for the boards I own which are not
| on the site?
| gitpusher wrote:
| Whoa. This is so cool and helpful. Too bad my board is Intel. Is
| there a way to contribute to this?
| tagyro wrote:
| I dropped a message to the creator :fingers_crossed: they open
| the motherboard database so we can make contributions
| rkagerer wrote:
| Can anyone recommend a specific, well-made, high-performance
| board (workstation or server) with loads of PCIe lanes and
| expansion slots, and sensible lane topology?
|
| All the motherboards these days make me feel claustrophobic. My
| current workstation is pretty old, but feels like it had way more
| expansion capability (relative to its time) than what's on the
| market today.
| rkagerer wrote:
| Some builds I kept tabs on:
|
| Let's Encrypt documented their early 2021 whitebox that used
| 128 PCIe 4.0 lanes, mainly for storage:
| https://letsencrypt.org/2021/01/21/next-gen-database-servers...
|
| Troy Hunt (HaveIBeenPwned) recently solicited upgrade advice
| from the internet and settled on an Asus Pro WS TRX50-SAGE
| (which doesn't appear to be in the MoboMaps database yet):
| https://gist.github.com/troyhunt/a6e565981e4769976e9cffb705f...
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(page generated 2025-11-20 23:00 UTC)