8RDA+ high Vcore shutdown fix!

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Originally posted by bias_hjorth
so you are saying that this could actually give 5v and not 4.68v if I "hook" my board up this way?

I am looking forward to hear the results :-)

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Well thats how it used to work.say your power supply is putting out 5.07v measured at a molex connector.and the mofset only shows 4.85 measured at the mofset itself.now that tell us that the board is losing voltage somewhere.normally thats why you see the power feed plug close to the mofsets so they get better current.now i have before soldered a wire to the feed to the mofsets them self and plugged into the 5v side of the power supply.on the old motherboards i could pick up a few mhz and stablity doing so.but i havent had to do that latley because of better built boards.and to be honest i forgot about it until today.
i am not saying it will even work on these new boards but the principle is the same.and heat in the mofsets can be caused by resistance in the current flow to them.low voltage is a big cause of heat in a circuit.

but i will try to check mine tonight

My 8RDA+ V1.1 will run 2.0v all day long......BUT, if i power off and then try booting up, i get no post......what gives???
I have to hold insert to get it to boot after this happens.
Any fixes welcome. VDD mod. done already.

Quote:

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Originally posted by bowman1964
Well thats how it used to work.say your power supply is putting out 5.07v measured at a molex connector.and the mofset only shows 4.85 measured at the mofset itself.now that tell us that the board is losing voltage somewhere.normally thats why you see the power feed plug close to the mofsets so they get better current.now i have before soldered a wire to the feed to the mofsets them self and plugged into the 5v side of the power supply.on the old motherboards i could pick up a few mhz and stablity doing so.but i havent had to do that latley because of better built boards.and to be honest i forgot about it until today.
i am not saying it will even work on these new boards but the principle is the same.and heat in the mofsets can be caused by resistance in the current flow to them.low voltage is a big cause of heat in a circuit.

but i will try to check mine tonight

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thx man - until now you have been a great help.. cant wait to hear about your results tomorrow:toast:

well i checked my mofsets and mine are getting 5.02v at the mofset them self so nothing wrong with mine being low.still there has to be a cause.just dont know where to look at the moment.

Man I read a dude is still having shutdown problems on his new 8RGA+. I thought for sure this new P4 style 12v line plug would fix that issue.

How come the Abit n2 doesn't have this shutdown issue or does it??

Man how come Epox dropped the ball on this a second time?

I´m really learning something on this thread.

Thank You

Hm, nice reading .
I wonder one thing, You guys says that the fix will help for system shoutdown, My system dosent shoutdown when iam at high vcore (over 2,0v) its frying . I have Cut Pin 16 on the voltreg chip and removed one of the resistors ( www.8rdafaq.com ) but the system stills frying on high vcore ! Please help me .
(i have heatsinks on MOSFETS and the voltreg)

The Abit N2 has a similar problem is many can only use say a vcore of up to 1.85-1.90v after say a fsb pf 185.

The Abit uses the HIP6301CB VRM for the vcore. I looked at the specs for it and it looks like either pin 10 or pin 19 has to be cut to do the same thing as was done for the RDA+. Can someone who knows about this stuff take a look at the specs and pins on the things and see what's what? Thanks

Here's a Pdf file for the chip.

http://www.intersil.com/data/fn/fn4765.pdf

Very nice collection of info here.....I have been following this thread since its start but havent posted to it since I have been taking the time to gather all of my gear for this project.
Step by step I will be doing all of the 8rda+ mods this week......my system is also geared around cosmetics and function so I highly doubt Ill get to far too quickly.
I too have hit the same wall at 2v, I thought that was strange since 1.975 would run super stable and loop 3dmark01 and 03 over and over with no crash, but then click it up to 2.0 and you all seem to know the outcome of that one.
Anyway, Ill be trying your cut mod tonight. Thanks guys for sharing this info!

Quote:

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Originally posted by bowman1964
well i checked my mofsets and mine are getting 5.02v at the mofset them self so nothing wrong with mine being low.still there has to be a cause.just dont know where to look at the moment.

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I've done the 5v mod. (wire to top-5V MOSFET, it previously had 4,62V on it, now 5,02V)
But the increase that i gained was 0,17Volts under load.
Now, i've been looking @ the scematics of the Volt-reg-chip, but i can't find what the 5V-outlet is on that chip.

could u or anyone else help me with finding it?
I think the volt-reg-chip is regulating a bit to good.
If we could find the 5v outlet of this chip, i'd try to cut the trace and solder a direct 5V wire from my PSU to that trace.
Since there shouldn't be any regulating chips further along the way in my point of view.
T.I.A.

Reading thru the post, I see many people noting a low 5v when at high vcore. This is something that I have experence when running high vcore when at the limit of an overclock on my current board using and antec 412x 400w. I fixed the low 5v rail by adjusting the pot to increase the 5 volt line. If I reduce overclock, then 5v goes way up. While trying to eliminate problems with a 9700 (than never worked out for me) I put in a true power 550. even with that masive psu, the 5v line droped significantly when highly overclocked at high vcore. i really think it could be the psu possibly needing a little extra umph. I have a 8rda+ on the way and will see how it works out for me.

I've run this xp2400 all the way up to 2.2v without problems. also, VDD is at 1.85v. I have an R300 too, so you cannot say the voltage regulator is lightly loaded.

Truepower 550.

Of course, I have high case ventilation and heatsinks on the voltage regulator MOSFETS.

Hello My English is not good!
But I hope that their can help me! I have the 8rda+ with 1700xp JIUHB. The CPU on 2600MHZ with 1,875Vcore has. I cannot place on 1,9Vcore!
My PC freezes then. nix goes more even if I on 2400MHZ place can I not 1,9Vcore adjust! Property with 5Volt read 4,92Volt. I hope that one me can help!
Thanks Markus from Germany

could be a cooling issue..

I have water cooling! max temp. 38° .
NB also water cooling and voltage regulator also very well cooled

have you made the vcore mod on the 8Rda+ ?

have only VDD MOD made on 2,0Volt!
FSB to 235MHZ: -) however "High Vcore Shutoff fixed" did not make.
Because I do not know, what exact I must make? And whether it helps me!

well if you start at first page in this thread there should be an explanation how to do the vcore mod.. Its actually pretty simple..

have here seen under MOD
http://www.8rdafaq.com/8RDA/index.php
High Vcore Shutoff Fix

White not which exact I make must?!?! Do I have to remove pin 16??? or still more??

just cut the trace at pin16..

http://www.oc-central.dk/mods/mod5/iru3055.jpg

Or you can take a exact-O knife and press on the metal leg itself and cut it. That's what I did when I had my Epox. it helped.

I separated pin 16!
But unfortunately is it still like that!
I do not come with the Vcore more highly! I have the Enermax 353Watt am much too weak?
Property already 5Volt MOD made
:mad:

My 8RDA+ doesn't shut down, even at 2.24vcore. :p

mw0ca, you sure you cut it completely?