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970a ud3p fail with 22 multi but never with 21. At any voltage. - Page 5

post #41 of 106
Quote:
Originally Posted by Iwamotto Tetsuz View Post

it has 8+2phases so its should be great for oc http://www.gigabyte.co.nz/products/product-page.aspx?pid=5194#ov
4 phases with a doubler, according to The Stilt, as I recall
post #42 of 106
All I know 10 chokes means 8plus 2
post #43 of 106
Thread Starter 
Quote:
Originally Posted by superstition222 View Post

4 phases with a doubler, according to The Stilt, as I recall

Yea but it still has double the part = double the power output. It just not as stable and efficient so it probably output more heat
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post #44 of 106
bits from different posts that are relevant, my emphasis also added
Quote:
Originally Posted by The Stilt 
Phase count isn´t everything. Most of the cheaper high phase count boards have doubled low(er) quality VRM (i.e. quantity over quality). You need to be able to dissipate the heat the VRM produces, regardless the phase count.

the UD3 R5 and UD3P have digital and doubled VRM. … The IR drivers paired with the VRM are also stronger than the ones on analog boards.

970A-UD3P has 8 virtual phases for the CPU each with a single NEC / Renesas uPA2724 low-side mosfet in it. Each of these fets are rated for 29A continuous current at 25°C meaning in total you can pull 232A from the VRM at this temperature.

ASUS boards have two sets of low-side fets, where as Gigabyte has only one.The current through each of the fets will be 33% lower than on Gigabyte. Each low-side fet on ASUS (OnSemi 4937N) is rated for 44A @ 85°C where as the NEC uPA2724 fets on Gigabyte are rated to ~16A in the same temperature.

For the UD3P mosfet model the de-rating factor is following:

100% @ 25°C (29A per fet or 232A in total)
80% @ 50°C (23.2A per fet or 185.6A in total)
60% @ 75°C (17.4A per fet or 139.2A in total)
40% @ 100°C (11.6A per fet or 92.8A in total)
24% @ 120°C (6.96A per fet or 55.7A in total)
0% @ 150°C (tJMax, absolutely no load allowed)

- On 220W TDP models the VRM must be able to provide 140A of current
- On 125W TDP models the VRM must be able to provide 110A of current
- On 95W TDP model the VRM must be able to provide 85A of current

The values below are rough estimates and only apply on this specific board.
They are safe values and within these limits the board should provide it´s normal expected life time.

- FX-8K series CPUs, < 4.4GHz, <1.3875V = Up to 80 - 85°C VRM temperature
- FX-8K series CPUs, < 4.7GHz, < 1.4500V = Up to 65°C VRM temperature
- FX-9K series CPUs, stock = Up to 75°C VRM temperature (impossible without water cooling)

Compared to Rev 1.0 they have removed several polymer capacitors used for filtering (they are expensive on ODM standards) and removed some of the digital NCT3933 sink / source controllers from the board too. Having the "extra" NCT3933´s removed explains why the voltage control options in Rev 2.0 are worse.

There doesn´t appear to be any change to the VRM despite the fewer load-line options would indicate that. However I base that just on the low resolution images available so I cannot really tell for sure unless someone provides higher res. images of the VRM (with heatsink removed) and of the VRM controller itself. If they have replaced the gate drivers for example with cheaper ones that definitely can effect on the maximum overclockability.

Gigabyte seems to use the same base bios for ALL of their motherboards, regardless if they are Intel or AMD based. They just seem to apply patch on top of a patch until they get it even remotely "working". There is no way you can otherwise explain the hidden bios options these bioses have. There is plenty of Intel exclusive stuff in the bios of these boards
post #45 of 106
Thread Starter 
Over current protection make this irrelevant if gigabyte have it like my asus and msi have im sure it build to prevent this. My gpu throttle at stock clock for current limit crap. Even if i run 24/7 on it at 1000 core 1500mem. And before 1070 with 1.180volt with 90c vrm. And it still run strong.

And those guy never considered those vrm are probably rated at 3.0v like the spec sheet says on some i checked. Meaning the amperage is higher than show here if i understand electricity well..


I dont trust anyone i read and try to learn by myself.


If those where the truth most Ud3p 970a and 4 phase one would have burned.

They are 0 temp reading with those chart either. While Capacitor do. Choke cant really burn they can kill the vrm i think if too much power is pull.


All i think of is those rating if they are right mean the Vrm will perform under higher stability at those temp and amp rating and will go worse going higher..


Meaning that maybe = Vdroop if yes well my sapphire gpu as dead vdrop at stock of .1volt so it should have burned since 6 month +





I have no idea. But i will see in 5 years if i still have the mobo.
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post #46 of 106
Thread Starter 
Im gaming for a week on it at 4.4ghz 1.4volt medium llc very stable voltage.


vrm at 75-80c mostly it seem via the sensor. heatsink is cooler.
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post #47 of 106
Quote:
Originally Posted by bonami2 View Post

And those guy never considered those vrm are probably rated at 3.0v like the spec sheet says on some i checked. Meaning the amperage is higher than show here if i understand electricity well..
.

Current rating doesn´t change with the voltage, unless there is a power limit.
Most N-Channel fets have Vdss of 30V and Vgss 20V. If they are rated for 25A it doesn´t mean you can draw any more than 25A regardless of the voltage.
post #48 of 106
Quote:
Originally Posted by The Stilt View Post

Current rating doesn´t change with the voltage, unless there is a power limit.
Most N-Channel fets have Vdss of 30V and Vgss 20V. If they are rated for 25A it doesn´t mean you can draw any more than 25A regardless of the voltage.
Yes you can
If you use pulsing method
http://www.onsemi.com/pub_link/Collateral/MJ11028-D.PDF
Rated 50a
100 max when pulsed
post #49 of 106
Thread Starter 
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Yes you can
If you use pulsing method
http://www.onsemi.com/pub_link/Collateral/MJ11028-D.PDF
Rated 50a
100 max when pulsed



So im halfways right? Damn those thing are complicated.



But over loading vrm will result in throttling before failure no? Over current is implemented for this i think?
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post #50 of 106
Quote:
Originally Posted by Iwamotto Tetsuz View Post

Yes you can
If you use pulsing method
http://www.onsemi.com/pub_link/Collateral/MJ11028-D.PDF
Rated 50a
100 max when pulsed

A) A Darlington power transistor?! lachen.gif Why not a electron tube
B) Read the small print

http://www.onsemi.ru.com/pub_link/Collateral/NTMFS4937N-D.PDF

There´s a link for a common N-Channel low-side mosfet.

Continuous Drain Current (TC / tCase 25°C) = 70A
Pulsed Drain Current (TA 25C, TP 10µs) = 210A

Usually the fets have duty cycle limitation of <1% in pulsed conditions.

i.e The pulsed current rating is completely meaningless.
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