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post #491 of 1217 (permalink) Old 07-21-2017, 02:07 AM
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Does all boards for X299 have OCP and Thermal protection? And what happens when there active? How long will the Asus motherboard last running near the protection mechanisms settings?


1) Yes, all the X299 models have OCP and thermal protection. See Elmor's post for details: https://www.overclock.net/t/1632665/intel-x299-socket-2066-vrm-thread/140#post_26207921

2) When the OCP is breached, the board will shut down. When the thermal temp is reached, the VRM will throttle the CPU to reduce power consumption and prevent the VRM temps from increasing past the threshold. The default setting on the ASUS boards allows for some margin to the max specified operating temp of the FETs. The data sheets stipulate that's the max temps the FETs can be run at for 'reliable operation', which implies the FET vendor has some confidence up to that point. How a higher temp affects MTBF is difficult for one to predict.

3) Then there's context; the likelihood of someone running a board at these temps continuously are minuscule. The bottom line is that the heatsink designs on all vendor boards should be better. That doesn't imply they're all going to suffer from catastrophic failure in the field, though.
Thanks, this is really good information. Why is higher temp MTBF hard to predict, shouldn't the temperature range in the FET specification be part of the MTBF? Also what is any ASUS X299 VRM FET MTBF?

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post #492 of 1217 (permalink) Old 07-21-2017, 02:17 AM
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Thanks, this is really good information. Why is higher temp MTBF hard to predict, shouldn't the temperature range in the FET specification be part of the MTBF? Also what is any ASUS X299 VRM FET MTBF?

there are long term operating temp range, occasionally burst and absolute max. I think he's referring to one of the ladder, which is not the temp FET should be operating for long time hence violating spec
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post #493 of 1217 (permalink) Old 07-21-2017, 02:33 AM
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Thanks, this is really good information. Why is higher temp MTBF hard to predict, shouldn't the temperature range in the FET specification be part of the MTBF? Also what is any ASUS X299 VRM FET MTBF?

there are long term operating temp range, occasionally burst and absolute max. I think he's referring to one of the ladder, which is not the temp FET should be operating for long time hence violating spec
I was just looking at the FET specification and Features then operation is -40 to 125c junction. http://pdf1.alldatasheet.com/datasheet-pdf/view/882686/IRF/IR35201.html

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post #494 of 1217 (permalink) Old 07-21-2017, 02:42 AM
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Thanks, this is really good information. Why is higher temp MTBF hard to predict, shouldn't the temperature range in the FET specification be part of the MTBF? Also what is any ASUS X299 VRM FET MTBF?

You'd need full access to all the MTBF curves, and AFAIK, no vendor provides thoroughly detailed curve deratings in the public domain. Typically, whats stated is where things 'should' last. Anything past that is pure 'forum-level' conjecture.

Kaby Lake overclocking guide here

ASUS Z270 buyer's guide here


Broadwell-E overclocking guide read here
post #495 of 1217 (permalink) Old 07-21-2017, 09:20 AM
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I was just looking at the FET specification and Features then operation is -40 to 125c junction. http://pdf1.alldatasheet.com/datasheet-pdf/view/882686/IRF/IR35201.html

Raja said "ASUS boards allows for some margin to the max specified operating temp of the FETs", so board doesn't really hard stop right when the max oper temp is reached?
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post #496 of 1217 (permalink) Old 07-21-2017, 11:44 AM
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Not sure where else to put this post and the pictures are for reference in case anyone wants them.

I bought an Asus X299-Deluxe today and took pictures.

The rear VRM "heatsink" doesn't look like it contacts anything. I will be using an EK monoblock for this motherboard when it gets released (hopefully soon) so I will take care of that issue with some fujipoly in short time. However, should I do something about it now anyway?

If anyone wants other pictures taken of the motherboard I can.

These are taken with a Galaxy S5 so...yea.






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post #497 of 1217 (permalink) Old 07-21-2017, 12:11 PM
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post #498 of 1217 (permalink) Old 07-21-2017, 04:05 PM
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These backplates are there mostly to add rigidity, helping to reduce the risk of warp and the FETs losing contact with the heatsink.

Kaby Lake overclocking guide here

ASUS Z270 buyer's guide here


Broadwell-E overclocking guide read here
post #499 of 1217 (permalink) Old 07-21-2017, 04:50 PM
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Thanks, this is really good information. Why is higher temp MTBF hard to predict, shouldn't the temperature range in the FET specification be part of the MTBF? Also what is any ASUS X299 VRM FET MTBF?

You'd need full access to all the MTBF curves, and AFAIK, no vendor provides thoroughly detailed curve deratings in the public domain. Typically, whats stated is where things 'should' last. Anything past that is pure 'forum-level' conjecture.
Where can I find stated where things should last?

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post #500 of 1217 (permalink) Old 07-21-2017, 10:33 PM
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Where can I find stated where things should last?

Whatever's in the datasheet is what should last.

Kaby Lake overclocking guide here

ASUS Z270 buyer's guide here


Broadwell-E overclocking guide read here
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