Help! +5V rail is down to 4.7V!

[Su1c1da1]

my 12V is 12.6
+5 is 4.7
+3.3 is 3.29

my question is is there any way I can make the +5 more up? which components uses the +5 rail?

 

[Duvie]

Amd or INtel system???

 

[Su1c1da1]

AMD

 

[Duvie]

What Brand PSU and specs??? Is it amd certified???

Are you ocing?? If so are you running increased vcore??? If so on that if set back to default and default speed how does the 5v rail look??? Is this just a sign of it being underpowered for what you are doing???

Are you having any instability??

The general rule I have seen is plus or minus 5% on each voltage rail is ithin specs....For the +5v rail that would mean no to be below 4.75 which you are. Is that 4.7v at idle??? Have you tried to load it and see if it falls even further???

 

[touchmyichi]

for reference, how much should you have left over when you are on load?

 

[Jgtdragon]

My antec 550w is solid with the 5+ , but the 12+ is low. The lowest it goes is 11.43 and the highest is 11.73. When under full load its 11.61-11.67. IS it ok??? I might unplug the 12v plug and replug it in. First day I install it, the highest I even seen even with just the cpu, rams, and video was 11.73.

I asked about this before and a fellow member told me the monitoring tool might not be accurate. He has a similiar reading, but when use a meter its 12 solid. Well, I guess if its stable its cool. I will replug the 12v connector anyways.

 

[pillage2001]

Originally posted by: touchmyichi
for reference, how much should you have left over when you are on load?

Anything above 4.75v should be nice.

 

[Su1c1da1]

Duvie, you're right after testing it.. when default speed with default voltage

12+ = 12.352
5+ = 4.972
3.3 = 3.344
1.6 = 1.632

but when I oced it with cpu vcore high, like 1.8 or 1.85

my other rails are fine but the 5+ rail goes down to below 4.75 at times..

 

[Duvie]

so the question remains...Do you have instability now??? If not then live with the fact that anymore ocing will surely cut more into that gap to instability.

What power supply??? Brand, size, amps on the +3.3 & +5v rail???

 

[Su1c1da1]

well, I use to be able to do 13.5 x 166 at 1.75v completely stable with prime95, now it won't anymore.. prime95 fails in a couple minutes. need to be bump to 1.8v instead..

 

[Duvie]

Sounds liek the power supply is starting to drop its rail and the +5v rail is the big one for AMD chips....I would look at getting an antec true power 430watt PSU....It has very tight +5v rails...

 

[Wind]

Originally posted by: pillage2001

Originally posted by: touchmyichi
for reference, how much should you have left over when you are on load?

Anything above 4.75v should be nice.

Normally, system stability is affected if the 5v rail dip below 4.5v under f/load. At 4.6v, stability normally return. Having said tht, I recently encounter a system tht has a 5v rail of 4.4v under prime95 but remain prime stable for 12 hrs.

So, a low 5v rail is no good on AMD platform...but if the system is stable...heck, I wouldn't worry much.

 

[majewski9]

yeah those voltages will never be exact and I wouldnt worry too much about it.

 

[Su1c1da1]

thanks for all the responses.. guess i'll keep it at this point for now... till that antec case goes back on sale at fry's for 99 bucks, then i'll get it.. for that Antec 430W truepower psu