Information required regarding Gigabyte Aorus AP850GM PSU

[Tito77]

Hi folks,

I was initially planning to get a Gigabyte Aorus AP850GM PSU for upgrading a friend's rig before the holidays.

Then I came across this review on the mentioned PSU from Kituguru.
https://www.kitguru.net/components/p...psu-review/12/

Seems like there is a DC power sequencing problem for the 12v rail that doesn't meet Intel's specs.

My friend is currently having an i7-8700K CPU paired with a MSI Z370-A Pro motherboard. Is this going to pose any problem for the CPU/ MB?
Also the review was posted last year & can anyone confirm if this problem has been rectified by Gigabyte in the latest units?

Thanks.

[Orion]

Hi there Tito77.
This isn't a problem IMO and the importance of the 12V and 5V voltage being higher than 3.3V during startup is uncertain. Intel doesn't mention why they think it's important, and even the reviewer is unsure why this specification was introduced. In the earlier reviews by Aris, he says:

According to Intel’s most recent Power Supply Design Guide (revision 1.4), the +12V and 5V outputs must be equal to or greater than the 3.3V rail at all times.
Unfortunately, Intel doesn't mention why it is so important to always keep the 3.3V rail's voltage lower than the levels of the other two outputs.

Intel should clarify the reasons for making this requirement, but I'd guess it's not so important or deal breaking.

[crmaris]

Since I don't talk to Intel, at all, I guess only Jon could help in this. It would be nice to know the reason.

[Jon Gerow]

Since I don't talk to Intel, at all, I guess only Jon could help in this. It would be nice to know the reason.

Intel doesn't reply to my emails either.

[Mezoxin]

Isnt this a first that an Independant regulated model isnt compliant with that Intel Specification ?

[Tito77]

I only have limited knowledge about PSUs & you guys have much better clarity than me.
But unfortunately I am feeling a bit more confused!

So, Orion, crmaris, Jon, Mezoxin, is it safe to use this PSU with an i7 8700K?

[-The_Mask-]

Certainly

[Tito77]

Hi guys,

I have found a new observation for the DC sequencing issue of the AP850GM review which I mentioned earlier.

Upon more carefully looking at the DC sequencing load graphs in the Kitguru review for this unit, its seen that the graph legend scaling is a bit inconsistent which makes it looks like the 12v rail is lower the 3.3v & 5v rails for sometime.

But if you take a closer look at the values of the 12v rail on the PSU Turn-On test, you can see that the voltage for the 12v rail starts from 7v then went down to 6v (for few ms) then went up slowly to 12v. Which implies that it has always been higher than the 3.3v rail at all times.
Same goes for the STANDBY TO FULL LOAD test, where as per the graph scaling the 12v rail is always higher than the 3.3v rail at all times.

If the graph scaling are correct, then it seems like there is no DC sequencing problem at all!

What do you think of this Aris?

Thanks to a user named Koby who pointed this out in the review.

https://www.kitguru.net/components/p...-psu-review/6/

[Tito77]

Since I don't talk to Intel, at all, I guess only Jon could help in this. It would be nice to know the reason.

Can you provide your feedback on the new info Aris?

[Mezoxin]

reading the intel specifications doesnt help either the wording and the graphs are very unspecific as they may suggest that they mean combined output level for the 12v1 12 v2 and 5v and not individual
See how they combined the 12v1 12 v2 and 5v in a single graph