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8.45V from +12v rail. New PSU : Corsair cx400w or CoolerMaster460W ?

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December 30, 2009 1:26:42 PM

I am kinda new to PSUs. I have been having problems with my Hard drives (like bad sectors etc) ever since i bought my 3rd 500GB drive and connected to the system. Now i suspect my PSU is to be blamed here for those hard drive failures, as scanning the drives with 'HD Sentinal' indicated that the bad sectors were caused when the hard drive tried to spin-up and this usually happens due to weak power supply.

Here are my voltage values from Everest Ultimate Edition:

CPU Core 1.18 V
+2.5 V 1.95 V
+3.3 V 3.38 V
+5 V 4.95 V
+12 V 8.45 V
+5 V Standby 5.19 V
VBAT Battery 3.04 V

After reading some threads here, i am guessing that +12V should be around 11.4 Volts (with 5% tolerence). But mine is only around 8.45 Volts. Is this a big problem? Is PSU really the cause of all the hard drive errors? I don't use any GFX card yet and have three 500GB drives connected. My PSU brand is iBall.

If yes, then please suggest a entry level good PSU. I've narrowed down my choice to:

Cooler Master eXtreme Power Plus 460W
http://in.coolermaster.com/products/product.php?language=in&act=detail&tbcate=2259&id=4174

Corsair cx400w
http://www.corsair.com/products/cx/default.aspx

PS: I would be using following components in my system
C2D E6850 3.0GHz
3 x Sata HDDs (might get one more in near future)
1 x DVD-RW Drive
1 x GFX card (like 4850 or other ATI 5 series) that i am planning to buy in near future. I dont have any currently, have been using onboard G33.


Any help would be appreciated,
Thanx.
a c 276 ) Power supply
December 30, 2009 1:36:55 PM

Dont use software to check your voltages, either check with bios(easiest) or a digital multimeter(100% accurate), most of the software i have used to check my voltages tells me my 3.3V rail is -7.6ish, i havent seen a program yet that reads voltages right. If your PSU was only at 8.45V on the 12V rail it wouldnt even run, and it has 2.5V rail with which im not familar. Double check using a DMM or in bios if you dont have one, post those voltages, if they are still off it might be good to switch.

Now if you are planning to upgrade to a 4850 then consider something a bit more powerful than either of those two, a good 500 or 550 for a higher power card, a 450 would be fine for a lower power card like a 4770 or 5770.
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December 30, 2009 2:02:07 PM

Thanks for your quick reply.

Well, i dont have a DMM so i tried checking with BIOS, but under 'PC Health Status' option in the bios, it simply says 'OK' in front of +12v and +3.3v entries and doesn't show any voltage values. I have a Gigabyte GA-G33M-S2H mobo.

And about the new PSU, unfortunately, my budget is limiting my options, so please suggest strictly among those two.
The corsair has single +12v rail with 30A while the cooler master has two +12v rails with 18A each.
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Related resources
December 30, 2009 2:08:46 PM

Also, i just tried the Power Reqirements Calculator at www.corsair.com with following parameters
1 x C2D (not overclocked)
1 x HD4850
4 x HDDs
and it still recommends cx400w, so i guess i can manage with 400-460W. But which one among those two?
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December 30, 2009 2:24:22 PM

Aneesh@4GHz said:
CORSAIR CX400



could you please justify your choice. Thanks. :) 
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a c 276 ) Power supply
December 30, 2009 2:44:19 PM

Of those two the 400CX is the better choice, the coolermaster only has 26A combined on its 12V rails vs the corsair's 30A. The cooler master also doesnt have APFC and isnt 80+ certified so its an older design and less efficient, we also dont know if it passed a 100% load test.
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December 30, 2009 3:01:13 PM

hunter315 said:
Of those two the 400CX is the better choice, the coolermaster only has 26A combined on its 12V rails vs the corsair's 30A. The cooler master also doesnt have APFC and isnt 80+ certified so its an older design and less efficient, we also dont know if it passed a 100% load test.



Hmm, thanks for your opinion. I have two votes for cx400w now. :) 
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a b ) Power supply
December 30, 2009 3:57:20 PM

make that a 3rd vote for the CX400

I have one running a Phenom II X2 550 Black Edition, Radeon 5770 and 500GB F3 - it's a good PSU
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a c 144 ) Power supply
December 31, 2009 3:15:00 AM

make that a 4th vote for the CX400
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December 31, 2009 4:03:59 AM

5th one .. i am using corsair 550vx from 2 years and this brand is trustable ...
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a b ) Power supply
December 31, 2009 4:05:53 AM

MAke that a 6th vote for Corsair 400CX.

It is 80+ certified.
The Fan is very quiet.
Has Active PFC.

My friend is running an OCed Dual (3.8Ghz) and HD 4870 with Cx400...No problems...
CM460 would have been toast.

And I'm running an E7300 and 9800GT with it.
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December 31, 2009 1:24:26 PM

7th vote for the Corsair 400CX

i have all my friends switched to them, they work great
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January 1, 2010 7:58:20 AM

So cx400w it is then.. ordering it right away! Thanks everyone!! :wahoo: 
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a b ) Power supply
January 1, 2010 8:37:29 AM

Corsair is a much better brand than Tagan...
For reliability Corsair is the best....

So Still 400CX.
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