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Freezing Issue - OC Phenom II X4 955 @ 4Ghz - Page 3

post #21 of 31
Also you might want to add this along with the heatsinks.

http://store.antec.com/Product/cooling-cooling_fan/spot-cool/0-761345-75018-9.aspx
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post #22 of 31
Thread Starter 
Quote:
Originally Posted by xd_1771;13752941 
BWG had problems despite having MOSFET cooling on his 785GM-US2H. At a really high clock speed & voltage, the MOSFETs squealed very loudly under load. Do ask him. The problem appears to be overall quality and limited phase count.

TEMP3 should be the VRM temp on that mobo - you are running at idle so it makes sense to be at 38C. Initiate load and they will get dangerously hot because there isn't ANY proper cooling (no heatsink, no airflow whatsoever)

say I buy the heat-sink for the VRMs, how do i increase the vCore volt? see the attached bios picture. there is no option in bios to change the vCore?!
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post #23 of 31
Thread Starter 
Quote:
Originally Posted by User1;13753805 
say I buy the heat-sink for the VRMs, how do i increase the vCore volt? see the attached bios picture. there is no option in bios to change the vCore?!

sorry. wrong pics.. here's the correct one.
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post #24 of 31
Quote:
Originally Posted by xd_1771;13752941 
BWG had problems despite having MOSFET cooling on his 785GM-US2H. At a really high clock speed & voltage, the MOSFETs squealed very loudly under load.

My old 785GM-US2H used to squeal like a pig when I would stress a 955 with Prime95/linx at 1.525v/4.1GHZ. I kept waiting for some caps to explode but they never did. headscratch.gif
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post #25 of 31
Quote:
Originally Posted by xd_1771;13752941 
BWG had problems despite having MOSFET cooling on his 785GM-US2H. At a really high clock speed & voltage, the MOSFETs squealed very loudly under load.

Very interesting, my VRMs have a slight squealing when i lower Vcore to below 1.2.headscratch.gif
Any idea what's going on?
Edited by qwertymac93 - 6/5/11 at 12:51am
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post #26 of 31
^^^ *looks at damric's post* that makes two real-life experience examples now. I can't explain the issue with qwertymac93 though. He does run an entirely different mobo and a lower TDP processor...
post #27 of 31
Quote:
Originally Posted by qwertymac93;13756929 
Very interesting, my VRMs have a slight squealing when i lower Vcore to below 1.2.headscratch.gif
Any idea what's going on?

It's actually the chokes that are squealing. They are very small coils (inductors) that act as filters (inductors resist change in current). At certain frequencies and voltages they have a bad habit of making noise. Nothing to worry about. You should hear some the the high power variable frequency drives at my work, squealing so loud.
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post #28 of 31
Thread Starter 
Quote:
Originally Posted by xd_1771;13752941 
BWG had problems despite having MOSFET cooling on his 785GM-US2H. At a really high clock speed & voltage, the MOSFETs squealed very loudly under load. Do ask him. The problem appears to be overall quality and limited phase count.
TEMP3 should be the VRM temp on that mobo - you are running at idle so it makes sense to be at 38C. Initiate load and they will get dangerously hot because there isn't ANY proper cooling (no heatsink, no airflow whatsoever)
Quote:
Originally Posted by langer1972;13752902 
Like he said
But you could buy these to help you VRM'S cool off.:thumb http://www.newegg.com/Product/Product.aspx?Item=N82E16835708011



Ok. I took your advice and made 3 heatsink for MOSFET chips. Waiting for some thermal adhesive. Ones I get hold of some, I'll put them together and test how my temp3 improves!? There aren't much clearance under the radiator, so it will be tight. Hope the heatsinka are enough to cool down the VRMs though. will keep your guys posted. thanks for all your help. reps for all.

looking from the pics of the BIOS from posts above, there's no way to increase the vCore separately right? I have to keep on increasing CPU volts for mabo to increase the vCore?

smile.gif
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post #29 of 31
Quote:
Originally Posted by User1;13767737 
Ok. I took your advice and made 3 heatsink for MOSFET chips. Waiting for some thermal adhesive. Ones I get hold of some, I'll put them together and test how my temp3 improves!? There aren't much clearance under the radiator, so it will be tight. Hope the heatsinka are enough to cool down the VRMs though. will keep your guys posted. thanks for all your help. reps for all.

looking from the pics of the BIOS from posts above, there's no way to increase the vCore separately right? I have to keep on increasing CPU volts for mabo to increase the vCore?

smile.gif

Good job I like the HS that big HS will drop temps alot by the size of it.Way to go gave you a rep for cool idea.thumbsupsmiley.png
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post #30 of 31
Thread Starter 
14 MOSFET Chips near the 8-Pin Socket. Could not find a heat-sink with right angle in each end, so put the big heat-sink on 10 chips and 2 smaller heat-sinks on the other 4 chips.

attachment.php?attachmentid=214290&stc=1&d=1307528983

attachment.php?attachmentid=214291&stc=1&d=1307528983


had few smaller pieces left so, stick them to MOSFET chips near the north bridge.

attachment.php?attachmentid=214292&stc=1&d=1307528983

The thermal epoxy is still setting. So will try OC again tonight after the glue solidifies.
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