Bios Setting "PCIe 10-Bit Tag Support"

[LittleBuddy]

I enabled this setting on my motherboard and it increased GPU performance 1-3% (potentially more in other scenarios) on my 4090 in my limited testing. The only information I found online is that it allows full utilization of the PCIE bus and reduces latency.

What does this setting actually do and is there any downside to it?

 

[pendragon1]

https://www.bing.com/search?q=PCIe+10-Bit+Tag+Support&aqs=edge..69i57j69i60l2&FORM=ANCMS9&PC=U531
"With PCIe Gen 4, to achieve full bandwidth, an adapter should support 10-bit extended tags. This allows for a 3x increase over the previous number of non-posted requests, allowing the adapter to achieve more performance. Not all PCIe Gen 4 devices support 10-bit extended tags and can cause issues during boot."