# Inserting x16 PCIe card disables second slot

**URL:** <https://forum.45homelab.com/t/inserting-x16-pcie-card-disables-second-slot/991>\
**Category:** Hardware\
**Tags:** help-and-suggestions\
**Created:** [January 7, 2024, 5:33am UTC](https://forum.45homelab.com/t/inserting-x16-pcie-card-disables-second-slot/991 "2024-01-07T05:33:12Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![technotim](https://forum.45homelab.com/user_avatar/forum.45homelab.com/technotim/32/10_2.png) [@technotim](https://forum.45homelab.com/u/technotim)\
**Post date:** [January 8, 2024, 12:32am UTC](https://forum.45homelab.com/t/inserting-x16-pcie-card-disables-second-slot/991/5 "2024-01-08T00:32:10Z")

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After hours upon hours of testing every combination, it seems that once the 16x is split between slot 5 and 6 (to x8x8) it cannot be split again to x4x4.

I also wanted to confirm that auto splitting works fine when using an x8 and x16 card however not when using an AOC-SLG3-2M2 in slot5 while slot6 is populated. This card works great in slot 3.

[https://www.supermicro.com/en/products/accessories/addon/AOC-SLG3-2M2.php](https://www.supermicro.com/en/products/accessories/addon/AOC-SLG3-2M2.php)

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