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3.3volt rail question....

post #1 of 9
Thread Starter 
Hi,

Can someone of greater knowledge than me please shed some light on my following questions...

What does the 3.3v rail actually support,
Why is my 3.3volt rail only showing 1.168v...
430

I have a brand new Corsair HX1050 in now, the PSU previous was an Antec TruePower 650w, replaced for the Corsair as I thought it was a PSU issue....nope, still the same, could this be a mobo problem ?

Also occasional stability problems if I try to set my memory to the default overclock of 1600@1.65v and do a Prime95 Blend

Does the 3.3v feed memory too ?

Thanks
Revo.
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post #2 of 9
Sometimes software just reads the voltages incorrectly, it's pretty unlikely that your 3.3 V rail is 1.168 V. The best way to check would be with a multimeter.

For example, my HWMonitor is reporting my 12 V rail as 8.10.... And it says my +5 is 5.8. Probably not the case, so I'd chalk it up as just being incorrectly read in software.
post #3 of 9
If you really want to check either use the BIOS or a multimeter. The latter is the best.
    
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post #4 of 9
I don't think you should worry too much about your low +3.3V readings (I get similarly low readings on the +3.3V line on several of my power supplies and I have no stability issues at all). The thing is that the +3.3V line is hardly used for anything anymore. Modern system rely on the +5V and +12V lines instead.

I suggest that your try increasing the voltage to your NB/IMC a little bit to see if that makes your system 100% stable.
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post #5 of 9
Thread Starter 
Ok Thanks.

I have taken the NB frequency off `Auto` and manually put in 2600MHz.
I have lifted the NB voltage up from 1.1v to 1.2v, lets see if that stabilizes matters.

What is the best software to test this change, or to know how to potentially improve things?

369

I shall check this is stable before I up my memory to the default Overclock of 1600@1.65v then try again.

Thanks.

Revo.

Correction....CPUNB was lifted from 1.1v to 1.2v......NOT the NB voltage as I had put. thumb.gifthumb.gif
Edited by Revolution996 - 1/31/12 at 11:53am
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post #6 of 9
Quote:
Originally Posted by Revolution01 View Post

Ok Thanks.
I have taken the NB frequency off `Auto` and manually put in 2600MHz.
I have lifted the NB voltage up from 1.1v to 1.2v, lets see if that stabilizes matters.
What is the best software to test this change, or to know how to potentially improve things?
369
I shall check this is stable before I up my memory to the default Overclock of 1600@1.65v then try again.
Thanks.
Revo.

Try increasing the CPUNB voltage, not the NB core voltage. For 2600 you're looking at about a .050V-.075V increase; leave the NB core at 1.1V.
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post #7 of 9
Thread Starter 
Yeah it was the CPUNB that had been upped...

450


Then I decided to put my memory to the OC setting of 1600@1.65volts...

450

Then I got a BSOD....!!!!!!! after I was halfway through Firefox.

Will upload the image if it happens again, might actually have one from before you can look at..

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post #8 of 9
In older PC designs the 3.3v and 5v rails actually provided power for the CPU. Now days the 3.3v rail is used mainly as a voltage sensing device and for remote power-up. As other's have noted, software often reads the voltages improperly. I would not be concerned at all about the readouts.

http://www.playtool.com/pages/psurailhistory/rails.html

http://en.wikipedia.org/wiki/Power_supply_unit_(computer)
post #9 of 9
it's pretty unlikely that your 3.3 V rail is 1.168 V. The best way to check would be with a multimeter.g.gif
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