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Minh Truong
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October 11th, 2021 18:00
T3400 spread spectrum clock
Hello,
I need to insert PCIe card to Precision T3400. To work with PCIe card, It is needed to turn off spread spectrum clock (SSC) on mother board. How can I turn off SSC on Precision T3400 ?
Best regards
1545
1
Posted October 12th, 2021 01:00
Please press the blue Accept as Solution button below if the post answers your question.
No such PCI-E setting for T3400 or any dell that I know of.
Afaikt SSC is for SATA PHY not PCI-E PHY.
PCI-E 3.X PHY Vs PCI-E 2.X 8b/10b / 128b 130b
https://teledynelecroy.com/doc/spread-spectrum-clocking-and-serial-ata
1543
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Posted October 12th, 2021 01:00
Hello, I have a Dell Precision T3400, I want to disable the spread spectrum clock, But I do not see any setting in BIOS
1541
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Posted October 12th, 2021 02:00
Please press the blue Accept as Solution button below if the post answers your question.
No such F2 Bios setting for PCI-E on T3400 or any dell that I know of.
Afaikt spread spectrum clock SSC is for SATA PHY not PCI-E PHY.
PCI-E 3.X PHY Vs PCI-E 2.X 8b/10b / 128b 130b
https://teledynelecroy.com/doc/spread-spectrum-clocking-and-serial-ata
1536
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Posted October 12th, 2021 04:00
I completely agree with @speedstep , I have never seen such a setting on Dell systems. This web page has a little more information on SSC as does this one and if you do a search for "turn off spread spectrum clock (SSC) on mother board" you will find a number of articles on the Internet.
I am not a Dell employee...I am forum volunteer
Serious work on an E5430 and constantly building and working on an i5-6500 Desktop
1534
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Posted October 12th, 2021 04:00
Please press the blue Accept as Solution button below if this post answers your question.
Spread spectrum controls are really added to motherboards for one purpose only - they are sometimes needed so that a device for sale within the US can include a legitimate Declaration of Conformity stating compliance with Part 15 of the Federal Communications Commission (FCC) Rules. This stipulates that operation of the device (motherboard), (a) may not cause harmful interference, and (b) must accept any interference received, including interference that may cause undesired operation. Sales of electronic devices within the US require the strict observation of all FCC rules and regulations. There is no overclocking or tweaking of Precision Models in bios so this option is never forthcoming.
https://f2labs.com/fcc-part-15
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Posted October 12th, 2021 14:00
hi @speedstep
Does it mean that every PC at US can not turn on/off SSC ?
speedstep
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1504
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Posted October 12th, 2021 19:00
@Minh Truong
Please press the blue Accept as Solution button below if this post answers your question.
Equipment legally sold in the US must be validated for FCC part 15 regulations.
I am not the FCC. I do not answer questions for every PC in the USA. CFR (Code of Federal Regulations) The U.S. Code (U.S.C.) is the compilation of federal laws.