z820 Bios setting ? Limit PCIe Speed

[taccess]

Hello

i have a setting in my bios

Advanced > Slot Settings > Limit PCIe speed > 2.5 gen 1 / 5Gb Gen 2 / 8Gb Gen 3/ AUTO

Does anyone know where i can find documentation on what auto means  and does 8GB = 800 MB/s per lane ???

[MtothaJ]

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@taccess wrote:

Hello

i have a setting in my bios

Advanced > Slot Settings > Limit PCIe speed > 2.5 gen 1 / 5Gb Gen 2 / 8Gb Gen 3/ AUTO

Does anyone know where i can find documentation on what auto means  and does 8GB = 800 MB/s per lane ???

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Basically its whether you want to run the PCIe slots in 1.0, 2.0 or 3.0 modes.

Auto will run at the highest possible speed your device plugged into the slot allows, and is generally the prefered option to use.

[DGroves]

you pretty much described what this bios setting does.

HP included it because there were some pci-e cards that had issues with the faster pci-e bus revisions and this setting allowed those cards to work as expected when the bus xfer speed was set lower

the ods of most people seeing such a card is almost nill, these were unique cards used for specific tasks and were not made in large volumes for the consumer market

[taccess]

Thanks for the information AUTO it is .

Is there documentation on this I have searched and can find nothing .

[mdklassen · Accepted solution]

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Is there documentation on this I have searched and can find nothing .

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? I have a setting in my [computer's] BIOS

? Advanced > Slot Settings > Limit PCIe speed > 2.5 gen 1 / 5Gb Gen 2 / 8Gb Gen 3/ AUTO

What happens if the "focus" is on that field, and then you press 'F1' for "help" ?

[DGroves]

if you want information on pci-e revisions please go to the PCI-E  site for details on each bus revision

https://pcisig.com/specifications

[taccess]

F1 Confirms that AUTO will set the higest possible speed

F1 is AWSOME

Thanks