NF7-s v2 warning siren

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Whenever I bought my current system;

NF7-S v2, 2400+ Mobile Unlocked

about 2 yrs ago, I overclocked it to 2.3 gig (200x11.5). This was the
limit I dared take it to and have it guarantee to POST. All worked fine
for a while...

A few months ago the chipset fan died. The processor HS/Fan was never
anything amazing, and I started to trigger the CPU temperature warning
siren. Occasionally the computer would switch itself off and do a
lower-pitched warning siren which i assumed was the overheat cut off.

Today I got fed up with it once and for all and splashed out on a new
chipset and cpu HS/Fan!

In taking it all to bits I removed the processor to blow the dust away.
When I replaced it the bios was moaning, so I reset all the settings as
best I could remember.

However, now I cant get it to overclock to anywhere near 200x11.5
without it shutting off and doing the siren that requires the machine to
be unplugged!

I've turned the warning and shutdown features off and it still makes the
noise, and reading forums suggests its a vCore warning?

atm Im running at 133x10, vCore 1.575 and its stable. If i up the vCore
and dont touch the clock/fsb settings i get the siren of death!

Does anyone have any suggestions?



Re: NF7-s v2 warning siren

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When you set the Vcore value, is the resulting measured Vcore
lower than it should be ? It could be your capacitors are failing
in the Vcore circuit. If the voltage drops low enough, maybe
the BIOS is designed to alarm on low Vcore. Visually inspect
the capacitors for signs of bulging or leaking.

Notice the slight bulge on the tops of some of the caps.

This is after the damage is done. This mobo won't be
posting in this condition. The top of one of the caps
is in bad shape. Sometimes the tops of the caps
are OK, but there is a brownish stain on the motherboard,
where electrolyte leaked out.


Re: NF7-s v2 warning siren

Paul wrote:
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Motherboards can POST and run with capacitors in much worse condition. I was
running a gameserver for a while, and the capacitors ended up like this:
It had been running about 6 months (and the board had already lived through
3 years of relatively hard use), during which I never had a reason to open
it up as it was perfectly stable. I then upgraded the ram, at which point I
noticed the caps in this state. The machine was still rock-solid stable. I
didn't believe it could be stable in this state, so I had it prime
overnight. Passed the test with no problem. Since I wasn't too concerned
about anything in the server, I just chucked everything back together and
set it running again. It ran without any problems for another two months
24/7 before I had to shut down the server because I was moving.

Of course, I don't recommend you do this unless you really don't care about
the hardware dying. In my case, the cost of replacing the motherboard was
approximately equal to the cost of buying a much more modern and powerful
setup, and the cost of having it repaired even higher. I could have done the
capacitor replacement myself but again, it wasn't worth it in a cost/benefit
sense. I may drag it out and do the replacements some day when I'm bored,
but at the moment it's just sitting in a box somewhere. Worst case is that
one of the CPU VRM FETs would have overheated and gone into a latched-closed
mode and pumped 5V into the CPU and possibly the RAM.

Grr, this post made me take that motherboard out of the bag, and now I've
got a smoked-electrolyte smell in my room ... better check the other boards
just to make sure ...


Michael Brown
Add michael@ to ---+--- My inbox is always open

Re: NF7-s v2 warning siren

Michael Brown wrote:
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And they can fail because of capacitors with no visible defects.  I had
a KT7 that ran with a couple of caps bulged to the point of splitting
open. Meanwhile my roomate's VP6 capacitors looked fine, but the PC
would not run because they had in-fact failed.

-Dylan C

Re: NF7-s v2 warning siren

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Yes. You overclocked it. That means everything in the system was
running stressed and it doesn't like it anymore. IME, 2 years seems to
be about the point where CPUs start to show problems on overclocked
systems that have managed to run more than a few weeks.

Basically eventually the components inside the CPU core begin to break


Same shit, different day.

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