this post was submitted on 27 Mar 2025
25 points (87.9% liked)

Selfhosted

45299 readers
1473 users here now

A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.

Rules:

  1. Be civil: we're here to support and learn from one another. Insults won't be tolerated. Flame wars are frowned upon.

  2. No spam posting.

  3. Posts have to be centered around self-hosting. There are other communities for discussing hardware or home computing. If it's not obvious why your post topic revolves around selfhosting, please include details to make it clear.

  4. Don't duplicate the full text of your blog or github here. Just post the link for folks to click.

  5. Submission headline should match the article title (don’t cherry-pick information from the title to fit your agenda).

  6. No trolling.

Resources:

Any issues on the community? Report it using the report flag.

Questions? DM the mods!

founded 2 years ago
MODERATORS
 

I'm looking at quad port 2.5Gbe Intel PCIe cards. These cards seem to be mostly x4 physically (usually PCIe gen 3) whilst I have a PCIe Gen4 X1 slot, which is more the theoretical bandwidth that the card can support. The card needs at the most PCIE Gen 3 X2 == PCIE Gen 4 X1 in terms of bandwidth.

How do I fit the card into a PCIe x1 slot? Won't it lose performance if all the pins are not connected to the physical PCIe connector? Is there a PCIe x1 riser that the community likes that is somewhat affordable?

Thanks

you are viewing a single comment's thread
view the rest of the comments
[–] [email protected] 27 points 4 days ago* (last edited 4 days ago) (4 children)

File a small slit in the end of the slot so the card fits into it, but runs past the back. The card will run at Gen 3 x1 speed, but otherwise work properly.

Many motherboards even come with the end of the PCIe slots open for this exact purpose.

Edit: Gen 3 x1 runs at almost a full GB/s, so a 2.5Gb/s card (notice the change in size of the "B") should have more than enough bandwidth on Gen 3 x1, even at 2.5Gb/s full duplex.

[–] litchralee 16 points 4 days ago

A word of caution for anyone cutting out the slot: make sure there aren't other instructions, like capacitors, ICs, and NVMe drives in the way of where the PCIe card will be.

The manufacturers that have the slot pre-cut will have already reserved the space, but even then, it's on you to check that it's suitable for a x16 if they only reserved space for a x8 card.

load more comments (3 replies)