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Is my PSU faulty

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September 30, 2012 3:34:22 PM

Hi, guys, i noticed that lateley my pc is running hot all the time so i downloaded Speedfan after cleaning it out as that made no difference. When I play games now, the GPU seems to lag, lack of power and getting hot i think, it runs at 50c even when doing nothing. I think it is the PSU but dont want to wste my money on a new one if it is not, i have a 400w xfx PSU at the moment and it is a year old, my GPU is a radeon 6670 HD and my CPU is an AMD Phenom, II x 4 965 so i should have asked for a better PSU when i bought it?. The Readings from Speedfan are:

VCore1 = 0.99V
VCore 2 = 1.49V
+3.3v = 3.31v
+5v = 6.85v
+12v = 12.16v
-12v = -5.94v
-5 = -4.05v
+5v = 3.63v
Vbat 3.09
GPU vddc 0.95v

Any help appreciated.

Thank you

More about : psu faulty

September 30, 2012 3:54:47 PM

First off...I couldn't find a 400 watt PSU on the XFX site, just a 450 watt...and if it's anywhere near those specs, you should be getting close to 28 volts on the +12 rail. You provided, through speedfan, showing only 12.16 volts...which is way too low. If you have another PSU I would take out the XFX and install another one just to see if it is a faulty XFX.
a b ) Power supply
September 30, 2012 4:07:57 PM

It's all good except your +5v u might wanna try another apps like hwmonitor or try confirm it at the bios or using mobo apps....

u can ignore the negative "-" voltage, it not usefull in old times but new comp not specify anymore...

Also your CMOS batt voltage is drop because of aging. it still fine but u will need replace it if it drop below 3v
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a b ) Power supply
September 30, 2012 4:11:41 PM

Th_Redman said:
...., you should be getting close to 28 volts on the +12 rail......


Are u sure u are not mistaking "voltage" with "ampere" :sweat: 

there no way +12v rail default voltage is 28v.. his rig will fried right away if it was +28v.......

the default voltage is what it names/rating + - 5%, so +12v is 12 volt +- 5%......

edit: back on topic, if u get the same reading in bios. then it's hard to said...

your psu had loose regulation at +5v rail, nowdays most device/part is using +12v to operate so u might no see the effect but for parts that still depends on +5v rail (fans, some optical drive, etc) it could cause a failure....

after a long tought get new one if u had extra money.....
a b ) Power supply
September 30, 2012 4:29:15 PM

The voltage readings are incorrect, but not due to the power supply being faulty but to the software used to read the voltages. If the voltages were correct then the computer would not work at all.
A faulty power supply does not cause the computer to run slow, or cause lagging in games. A faulty power supply would cause the computer to crash or not start up.
Often the fans on the GPU or CPU are intelligent and only speed up when the temperature goes above 50c so it would appear that the temperature is stuck at 50c
I don't think that you have a hardware problem at all, but you may have a software one. Try using MSCONFIG to remove unnecessary items in your start up, or even try reinstalling the operating system.
September 30, 2012 4:57:53 PM

I opened the case and the PSU moelis NRP - VC403, its definatley 400w as located some some on ebay. I will try the MSCONFIG, ty. The HW monitor reports as:


Hardware monitor ITE IT87
Voltage 0 0.99 Volts [0x3E] (CPU VCORE)
Voltage 1 1.49 Volts [0x5D] (VIN1)
Voltage 2 3.31 Volts [0xCF] (+3.3V)
Voltage 4 12.16 Volts [0xBE] (+12V)
Voltage 5 -8.58 Volts [0x86] (-12V)
Voltage 7 3.63 Volts [0x87] (+5V VCCH)
Voltage 8 3.10 Volts [0xC2] (VBAT)
Temperature 0 43°C (109°F) [0x2B] (TMPIN0)
Temperature 1 35°C (95°F) [0x23] (TMPIN1)
Temperature 2 47°C (116°F) [0x2F] (TMPIN2)
Fan 0 2123 RPM [0x13E] (FANIN0)
Fan PWM 0 0 pc [0x0] (FANPWM0)
Fan PWM 1 2 pc [0x3] (FANPWM1)
Fan PWM 2 0 pc [0x0] (FANPWM2)
Register space LPC, base address = 0x0290



September 30, 2012 5:38:08 PM

My bad...I did mean amps, not volts. Sorry. I hope you get the right response though.
!