+3.3 voltage warning

Asus A8v-xe motherbord
May 8, 2010 at 16:17:43
Specs: Windows XP Professional
I've getting blue screens and forced restarts lately up to the point where I reinstalled XP Professional. Much better, but still forced restarts or shutdowns and the ASUS Probe warns that +3.3. voltage is around 2.64.

Is this overheating or a powersupply issue?
Does anybody have a suggestion?

I'm using:
ASUS A8V-XE
AMD Athlon 64 300+
1 GB (zx 512) RAM


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#1
May 8, 2010 at 16:21:56
You are going to need a new power supply. The 3.3v rail is failing and is only producing 2.64v, way below the acceptable variation.

either that or the power supply is being overloaded.

Stuart


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#2
May 8, 2010 at 17:15:25
Thank you Stuart, finally a clear answer after days of looking in forums.
What important specification for a power supply should I go for?

I've got 1 DVD, 2 harddisks, 1 NVIDIA card and a network card, that's not all that much, is it?


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#3
May 8, 2010 at 17:49:40
There are many things that will determine what is best. The amount of RAM will play a part as well as the type of Nvidia card you have.

Have a look at this site. There is a lot of information there

http://extreme.outervision.com/psuc...

The important thing to remember is the wattage is only a very rough guide. The amperage on the different voltages is also important. The trend in recent years is for more power to be taken from the 12v rail where previously the 5v rail was more demanding.

However in your case I suspect that the power supply is just dying on its feet and a similar power supply in good working order with suffice.

Stuart


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Related Solutions

#4
May 8, 2010 at 18:25:17
Thank you, I appreciate you taking the trouble to help me out very much. I just found out I-ve got an ATX-400 power supply and the output should be enough. But it's been a couple of years so I guess it just needs replacing.
I will do this after the weekend.

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#5
May 8, 2010 at 18:34:49
ATX-400 should be plenty for most circumstances.

Unless you have a really demanding video card or a crappy power supply you should not have any problems with 400 watts.

Just don't go for the cheapest. The cheapest are cheap for a reason.

Stuart


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#6
May 8, 2010 at 20:03:47
You can't beat this deal on a 400W Corsair power supply. It's on sale for $50 & with the promo code, you get another $5 off. There's a $15 rebate & to top it off, it ships for free. In the end, it will cost you $30.

http://www.newegg.com/Product/Produ...


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#7
May 9, 2010 at 10:23:54
I've got an NVIDIA 7300GT 256MB Graphic card, that shouldn't put too much pressure on the power? I've replaced the battery on the mainboard (because I could pick one up at a gas station on a Sunday), the +3.3.v is now hovering around 2.67, so no major improvement but worth a shot I thought. I better get my hands on a new power supply.
Thanks again.

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#8
May 9, 2010 at 11:05:23
The battery on the main board has absolutely no effect at all on the voltage coming out of the power supply.

The difference in voltage can be put down to variations in temperature. That's is what voltage regulators are for, to keep the voltage constant despite variations in temperature. .03 volts is neither here nor there.

Stuart


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#9
May 9, 2010 at 11:40:44
In addition to all the advice above I would suggest you NOT run that rig until you change out the PSU.

If it goes out completely it could take out the motherboard and possibly more.


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#10
May 9, 2010 at 13:36:13
OK, thanks again. Does the name +3.3v indicate that a healthy reading should be over 3.3?

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#11
May 9, 2010 at 14:07:53
I won't use a PSU with more than 5% fluctuation on any of the rails.

So, in the case of the 3.3V rail the +or- would be .17. The high side at 3.47V & the low at 3.13V. Some say 10% is OK.

This tolerance works for all the rails.


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#12
May 9, 2010 at 15:36:06
Then mine is way too low...

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#13
May 10, 2010 at 06:20:52
I've changed the power supply (ATX550W) and it works: the +3.3.v is now a healthy 3.20. Thank you, Stuart! And also OtheHill!

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#14
May 10, 2010 at 07:36:33
You are welcome

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