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EPoX MotherBoards EPoX Intel and AMD Motherboards.


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  #21 (permalink)  
Old 16th June, 2006, 11:51 AM
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Quote:
Originally Posted by mikey1280
Can other people test the voltage on their board to see if they get similar results please
I would mikey, but alas! I don't have a multimeter anymore. Sold my last one, and have wished since that I had not.

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  #22 (permalink)  
Old 24th June, 2006, 10:31 AM
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Ok never mind mate, could you borrow one from someone you know?
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  #23 (permalink)  
Old 30th June, 2006, 11:04 AM
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Right, I will get round to testing my EP-9NPA+ Ultra after the weekend. It's frustrating that the board drops the Vcore by 0.025V when the CPU is under load, as it means that when the CPU is idle it has to be a higher voltage than needed, thus producing more heat. This did not occur with the same CPU and PSU on my EP-9U1697 GLI.
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Old 3rd July, 2006, 02:34 PM
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Quote:
Originally Posted by ochest
Right, I will get round to testing my EP-9NPA+ Ultra after the weekend. It's frustrating that the board drops the Vcore by 0.025V when the CPU is under load, as it means that when the CPU is idle it has to be a higher voltage than needed, thus producing more heat. This did not occur with the same CPU and PSU on my EP-9U1697 GLI.
The voltage is higher but the current is lower when not under load. Please can you explain how that produces more heat ?

Does a British Kettle boil a cup of water twice as fast as an American one ?
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  #25 (permalink)  
Old 7th September, 2007, 01:31 PM
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HI All

Jumping into a rather old thread i've had a probe about with a multimeter.

Bios setting +0.1v so for an opteron 165 should be 1.45v
Bios readout 1.56v

Mm reading whilst in bios at VCC CPU FB pad=1.485v
Mm reading at VCC at Winbond W83627 =1.519v

Under windows XP
VCC CPU FB=1.520v
VCC CPU Winbond=1.535v

Under Orthos Load
VCC CPU FB=1.403v
VCC CPU Winbond=1.475

I would imagine the feedback reading of 1.403v is the most accurate as the winbond
one has to travel the length of the board till it gets to the W83627.
The jump from 1.485v under bios to 1.520v under xp is confusing unless the bios is
loading the cpu somehow and the drop from 1.520v to 1.403 v under load is ridiculous.

The whole 4 phase supply runs quite hot.The 8 mosfets heatsinked are hot as are the 4 unheatsinked mosfet drivers.

Image of 9NPA VCC - Photobucket - Video and Image Hosting

Image of W83627 - Photobucket - Video and Image Hosting

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Old 7th September, 2007, 01:59 PM
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It's pretty normal for the switching FETs to be fairly toasty unless you have some kind of active cooling on them; I've yet to find a board that the FETs didn't routinely push 50-60C.
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  #27 (permalink)  
Old 7th September, 2007, 06:22 PM
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Have put some heatsinks on all the power supply mosfets and mosfet drivers

only makes a small difference

Will check it with a Opteron 146 and a 3700.
Begining to think the board power supply doesnt supply enough current for a dual core processor.

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