8RDA+ high Vcore shutdown fix!

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Originally posted by TechTones

The highest I can take this chip is like 2200. Did cutting that trace allow you to OC the CPU higher?

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Yes and no. The 2400+ I have is only good to around 2250Mhz with my AX-7 in a closed case. That's as high as I got with my KR7A-R too, 2250Mhz (180x12.5). Now after this mod I have the voltage to match that CPU speed 2258Mhz (214x10.5). I can run almost Prime stable at 2300Mhz (219x10.5) with the system cover off and 2v Vcore. The best I could do stable before the mod was 2200Mhz (220x10), I needed 1.9v to hold that speed. SO after the mod I got my 50Mhz back. Wow, what a bunch of crap for 50Mhz. :D

Water cooling would change everything of course. With WC you have the ability to run high power levels to the CPU. This mod won't improve on the power limitations of the board though, that remains the same. The mod only lets you run at the absolute maximum CPU power the board can deliver without shutting down due to tripping the overcurrent protection. Unfortunately, the maximum power may not be a stable power. If you really plan on pushing this board that hard, I'd definately add some heatsinks to the MOSFETs and the IRU3055.

If I was a betting man, I wouldn't bet on being able to match that 2500Mhz clock you had on the other board. I don't have a real warm fuzzy feeling about the quality of the power section on the 8RDA+. It's really a shame because this board is so close to being able to dominate anything around.

Let's hope the rumors of a suped up version of the 8RDA+ being in the works is true. I'd buy it.

Yes I have the NB and CPU WC. Vdd 1.85v

But 2500mhz CPU is at 2108 :mad:

So you get BSOD after 1.9v right, not shutdowns?

This mod will not fix that. Sorry dude. :(

Only BSOD with fan on VRM. Shutdowns with no fans after 1.90v

BSOD stand for Black Screen On Display? because if it does then i dont wanna do this mod.... does it?

Yes you get a black screen like me but I was getting Blue Screens of Death [ BSOD] after I put a fan on the VRM. It seems it helped a drop but not enough.

voltage regulator mosfets?

The VCore Voltage Regulating Module and 3055 and the mosfets too.

uhmmm, im pretty sure this may be the problem....

i try prime95 at 1.8v 10.5*166 and it lasts like 15-20 tests
i try prime95 at 1.9, 1.95, 2.0v 10.5*166 and it lasts like 1 second.
but it doesnt shut off... the screen goes black...? could this be the problem?

i have already tried to cut the trace but i dont think i cut it all the way.

this makes no sense... prime95 will finish at 1.8v but my screen will go black at 1.825 wit prime95... sparticus? anyone?

Well it seems to the same problem we're haing but yours is worse unless your ram is not up to par it might happen. Lower the setting and up the vdimm all the way to 2.9

Also try upping the AGP card voltage to 1.6v

If that doesn't help, it looks like you might have the same problem.

I have some good news to report and a possible fix for this. *Maybe*

OK,

when I saw you could run the vcore at 2.2 but had to have the CPU at stock speed and not have a shutdown, this showed me it might NOT be an OVP issue. It looked like a heat issue to me.

I also read one guy touched his finger to the VRM at 2.2v and he got a giant blister on his finger it was so hot.

So in short, I took a 233MM anodized heatsink and cut it up to fit on top of the vcore VRM. The VRM is about the size of a ram chip.
But the little heatsink is pretty tall even though it's only six prongs big. I mixed epoxy with thermal paste 50%/50% and glued the sink over the VRM. I let it dry and put a 80mm fan over it. It also blows on the mosfets.

As of right now, I'm running Prime since 9:12 and it's 9:42 now
at 2.05v and it hasn't shut down yet

Before it would shut down right away. So glue a nice big heatsink on top of the VRM plus a fan. If you don't have an anodized heatsink, just put some tape over the little legs on the VRM so you don't short anything out. Most of the time if you glue it perfectly flat, it won't touch the legs at all.

Good luck

Still running :banana: :wiggle: :toast:

Good job dude!

Extra cooling is a good idea. I did always have plenty of air flowing over the power section on my mobo. In my case the mod made the difference. I no longer get any shutdowns after the mod with no changes in cooling.

My system is running steady now at 1.975v after the mod. It probably would be a good idea for me to add a heatsink to the 3055 though, it certainly wouldn't hurt.

You can follow the fun at this thread at AOA.

My name is Bondo there ;)

http://www.aoaforums.com/forum/showt...0&pagenumber=1


BTW, I'm Priming away at 2.1v and my 2400+ at 2500mhz!!!!:toast:

Quote:

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Originally posted by p0opyfac3
this makes no sense... prime95 will finish at 1.8v but my screen will go black at 1.825 wit prime95... sparticus? anyone?

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Like TT says, you may want to try added cooling. If you still get the shutdowns after that, you can still try the mod.

Make sure you're running the new 3117 BIOS too, some people have reported that made a difference.

Quote:

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Originally posted by TechTones
You can follow the fun at this thread at AOA.

My name is Bondo there ;)

http://www.aoaforums.com/forum/showt...0&pagenumber=1


BTW, I'm Priming away at 2.1v and my 2400+ at 2500mhz!!!!:toast:

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Nice! :banana:


You must be water cooling right?

Yes I am. The NB too plus air cooling on the SB :banana:

Plus VDD at 1.87v

Prime still running at 2.1v :slobber: :slobber: :slobber:

I found an added benefit for this fix even if you don't use high Vcore's.

The CPU now runs using less Vcore then before more stable. My 2400+ is at 2400mhz right now and 1.85v. I know the CPU can do 2500 so I'll take it up slowly.

This mod stops the vcore fluctuations too.

the VRM is the IRU chip that spartacus was talkin bout right?

yes

Mhh, extra cooling sounds good. If it doesn't, is there a possibility to make the mod temporarily? I only need 2.1V 4 one 3DMark loop.

@TT
What's ur Ram timings? I'm running 224 MHz 2-3-3-4 with over 3,4 GB/s?

I have one stick of TwinMOS 512.

In the Epox 8K3a+, I could run this ram at 223 2-2-2-5

But in the N2, I can only do 226 at 3-3-2.5-6

This board needs more Vdimm like at least 3.10v

What ram are you using Corsair?