View Full Version : Low 5V Lines
Svenn
02-07-2003, 05:18 PM
Argh. My 12 and 5v lines were running 11.91 and 4.91 respectively and now all of a sudden the 12v is over 12, like 12.05 or so and the 5v is running 4.56 or so! If I lower my vcore, the 5v raises a little. Is there any other way I can fix this? I think it's holding back my overclock...
use the 12v P4 connector on your 8RDA
I have tested voltages on the board, and the USDM/MBM is not that accurate.. if you have a multimeter test at board level.
As far as using the P4 connector on the board.. ther 8RDA doesn't use that plug( although I think they should), the NF7 does.
Svenn
02-07-2003, 05:36 PM
I've got the P4 connector hooked into my Prom ATX Power Conditioner... I'm reading directly in the bios btw muzz....
felix88
02-07-2003, 08:49 PM
i don't trust the onboard sensors.
the BIOS on my old BH6 says my 12v rail is running at 11.7v or so, but if i measure my 12v rail with a DMM it's running at about 12.06v.
DisposableHero
02-08-2003, 01:00 AM
Originally posted by Roop
use the 12v P4 connector on your 8RDA
how do you do that?
Rudzer
02-08-2003, 02:23 AM
I've also got the same problem, think the low 5+ rail is limiting my stable oc (2100+ AIUBH)! I seem to get 4.7v, will that in any way limit my overclock, not that I can complain (2.2Ghz 24h/7d) but more is always better (in this case ;) )!
felix88
02-08-2003, 02:29 AM
Rudzer, your low 5v rail could very well be limiting your OC.
but before you assume it's your PSU, measure the voltages with a DMM. mine never go as low as the onboard sensors do, even the ones in the bios.
Rudzer
02-08-2003, 03:23 AM
cheers m8, I keep getting 4.8-4.7 in USDM, but not totally sure, thing is it ain't prime stable at over 2.3Ghz - 1.85v which I suspect is kinda odd to say the least!
As for the 12v p4 connector, you reckon it will help anything?
cheers
felix88
02-08-2003, 03:26 AM
it could help. give it a try, it's not going to hurt anything.
usually +/- 5% on any of your rails is a good range to be in.
Rudzer
02-08-2003, 03:28 AM
Yeah gonna give it a shot :)
Svenn
02-08-2003, 08:29 AM
Originally posted by DisposableHero
how do you do that?
Yeah, How do you do that? Like I said, I've got the P4 connector hooked into my Power Conditioner... but the P4 connector from there doesn't go to anything... How do I measure voltages by myself? I think my low lines are limiting my O/C though... Is it possible I've bogged down my PSU... It's an Enermax 550W, here's what's running on it:
2 cold cathode lights
4 120mm Enermax adjustable speed fans
3 80mm Enermax adjustable speed fans
9 40mm miscellaneous fans
1 MCW50-T 80W pelt
1 Prom connector
1 floppy drive
1 dvd-rom drive
2 hard drives
Could that be doing it?
LikwidKool
02-08-2003, 09:16 AM
my 12 and 5v rails are low too. Like 4.95 and 11.98. Was bothering me cause these rails were good on my 8K3A at 5.03 and 12.04 . I thought this very weird. I have to try the multimeter to see what's up. I just installed this board yesterday so I am still getting used to it. Won't post above 183fsb. I get a checksum error.:( I think I need the vdd mod, but that is a different post entirely. don't want to thread crap here!;)
Also I have seen no port on the board to put the p4 power connector. Please explain how you did this.
felix88
02-08-2003, 12:56 PM
you can check your 12v and 5v rails using a molex connector.
the 2 plack wires are ground, the yellow wire is 12v and the red is 5v.
should be easy enough to check.
BMORIN
02-08-2003, 02:43 PM
Well, anything lower than 4.7 is not good, in fact, I'm surprised your computer doesn't shut down at 4.5. Anyhow, after checking molex with a digital multimeter, if you're still that low only two solutions: 1) Come down with your vcore 2) Buy a tgi 420W.
You can ajdust the 5v and 12v rails if needed with that psu.
BTW, you never told us what size PSU u were using. I suspect 300w or 350w.
BMORIN
02-08-2003, 02:46 PM
Whoops, didn't see you had a 550w already and didn't see that you had all that stuff connected. Holy toledo.
Come down with vcore OR get a tgi 520w
Svenn
02-08-2003, 05:58 PM
What about buying a separate PSU for the Pelt? Would that help? And how would I set up both PSUs?
EDIT: Something like this one? (http://www.xtwerkz.com/dedicated_power.htm)
felix88
02-08-2003, 06:04 PM
a seperate PSU for the pelt would probably help a lot. i kinda figured you already had one.
LikwidKool
02-08-2003, 08:49 PM
just thought I would update. I checked my volts with a multimeter, and I found out what I was hoping. mbm/usdm are crap. My 5v, 12v and 3.3v rails are rock stable. They are 12.2v, 5.04v, and 3.33v all under load. mbm/usdm was saying 12.10v, 4.98v, and 3.08 respectively. I use an Antec Smart Power 350w psu. I still need to upgrade but only for my own reason's and not because of low rails.
Thanks for the tip about the Molex connector. Pretty handy. I also used the orange wire on one of the p4 connector's to measue the 3.3v rail.
felix88
02-08-2003, 09:38 PM
orange wire, i'll remember that. thanks. :)
LikwidKool
02-08-2003, 10:47 PM
yeah I remembered reading that somewhere. No prob, you guy's gave the molex idea!;)
tediber
02-09-2003, 01:23 AM
all you have to do to use 2 PSUs at the same time with one switch ..... is to join the green wires of each the mobo connector from both PSU to each other and a pair of black wires 1 from each PSU ..... and there you go ......both will turn on at the same time when you push the ON button
Rudzer
02-09-2003, 03:23 AM
tediber - what cooling you got in your rig? (and vcore)?
OBS: Sorry for the OT
tediber
02-10-2003, 10:18 AM
MAZE3+blackIce pro ..... Vcore is 2.1 at 2.376ghz ..... 1.95Vcore at 2.3ghz ..... 1.85Vcore at 2.2ghz
shadco
02-10-2003, 06:56 PM
Don't trust the bios or mbm readings for voltage if they were accurate there is no way this thing would be stable
a7n8x at 12.5x200
http://mywebpages.comcast.net/ddr333/Asus/mbm01.jpg
Shad