Antec 550 TruePower PSU and Voltages

[Kevin Miller]

I just installed an Antec 550 TruePower PSU and have noticed that,
according to MBM5, all of the voltages are pretty low:

+3.3v is 2.9v
5v is 4.52v
12v is 11.49v

I realize that these voltages can be adjusted up somewhat with this
unit, but I was just a little surprised that all the voltages were
showing so low. The previous PSU was an Antec 400W model and the
voltages on that model were very close to what was called for.

My system specs:

ASUS P4P800 Deluxe
P4 2.8 HT @3.38 w/Swiftech heatsink and 80mm Delta fan
ATI AIW 9800 Pro
Audigy 2 sound card
600G HD (5 drives)
Samsung CD-RW
Buslink DVD writer

Has amyone else had this experience with this model PSU?

Thanks in advance!

Kevin Miller

"The avalanche has already started;
it is too late for the pebbles to vote."

 

[scott c.]

I just installed an Antec 550 TruePower PSU and have noticed that,
according to MBM5, all of the voltages are pretty low:

+3.3v is 2.9v
5v is 4.52v
12v is 11.49v

Are you sure it's a TruePower (TP) 550 and not a TrueControl (TC) 550? If
it's a TC550, and you don't have the control panel hooked up, that could
explain the low voltages (assuming they are accurate).

I realize that these voltages can be adjusted up somewhat with this
unit, but I was just a little surprised that all the voltages were

The TC550 comes with a panel to adjust 3.3v, 5v, and 12v rails. The TP550
is not readily adjustable; does not have adjustable pots inside the PSU
chassis like some other Antec PSUs, however it can be modified for
adjustable rails by installing fixed and variable resistors in series and
parallel with the rail sense lines.

See this thread for Antec TP rail mod
http://www.xtremesystems.org/forums/showthread.php?s=a8ac07c3d79d910cea9186012f5f7ffb&threadid=14059

The mod is fairly simple, but can destroy components, and/or start a fire,
and/or seriously injure or kill you if done improperly. Proceed at own
risk.

showing so low. The previous PSU was an Antec 400W model and the
voltages on that model were very close to what was called for.

You have a fairly heavy load with the components listed below, but the TP or
TC 550 should do better than your previous PSU. If you indeed have a TP550,
double check the rail voltages at the ATX connector using a digital
multimeter to confirm the PSU as the culprit. Might be just a bad PSU.

If you actually have a *TC*550, hook up the control panel (connects to the
white cable bundled with all other output cables) and increase the rail
outputs using the potentiometers on the panel, as documented in the user
manual.

Final disclaimer: Modifying or measuring PSU outputs can destroy
components, and/or start a fire, and/or seriously injure or kill you if done
improperly. Proceed at own risk. Have a qualified person assist you if you
have any doubts about handling this.

 

[Kevin Miller]

Are you sure it's a TruePower (TP) 550 and not a TrueControl (TC) 550? If
it's a TC550, and you don't have the control panel hooked up, that could
explain the low voltages (assuming they are accurate).


The TC550 comes with a panel to adjust 3.3v, 5v, and 12v rails. The TP550
is not readily adjustable; does not have adjustable pots inside the PSU
chassis like some other Antec PSUs, however it can be modified for
adjustable rails by installing fixed and variable resistors in series and
parallel with the rail sense lines.

See this thread for Antec TP rail mod
http://www.xtremesystems.org/forums/showthread.php?s=a8ac07c3d79d910cea9186012f5f7ffb&threadid=14059

The mod is fairly simple, but can destroy components, and/or start a fire,
and/or seriously injure or kill you if done improperly. Proceed at own
risk.


You have a fairly heavy load with the components listed below, but the TP or
TC 550 should do better than your previous PSU. If you indeed have a TP550,
double check the rail voltages at the ATX connector using a digital
multimeter to confirm the PSU as the culprit. Might be just a bad PSU.

If you actually have a *TC*550, hook up the control panel (connects to the
white cable bundled with all other output cables) and increase the rail
outputs using the potentiometers on the panel, as documented in the user
manual.

Final disclaimer: Modifying or measuring PSU outputs can destroy
components, and/or start a fire, and/or seriously injure or kill you if done
improperly. Proceed at own risk. Have a qualified person assist you if you
have any doubts about handling this.

Sorry about that; I meant to say that I had just installed the
TrueControl 550.

Kevin Miller

"The avalanche has already started;
it is too late for the pebbles to vote."

 

[et]

I do have the TP 550. And I'm having the same problem. Just ordered a PC
Power & Cooling unit. Always had good luck with them. I think my ATI VGA
problems are related to the power supply.

Koko