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Voltage variance questions

post #1 of 6
Thread Starter 
okay, so what are safe/stable variances on PSU rails?

example, what's the lowest voltage on the 12V-rail that would still be stable??? (specifically for my system)

I ask because i think i'm getting some bad stability issues due to my PSU. my 12V rails sits at 11.84 most the time, but will flux up to ~11.94, but rarely. however, it's been stooping down to 11.75 a lot lately. is that really really bad? or just kinda bad? my 5V rail sits 4.95, and my 3.3V rail sits at 3.21. will this all add up to random restarts and shut offs?
post #2 of 6
Quote:
Originally Posted by Tobuk
okay, so what are safe/stable variances on PSU rails?

example, what's the lowest voltage on the 12V-rail that would still be stable??? (specifically for my system)

I ask because i think i'm getting some bad stability issues due to my PSU. my 12V rails sits at 11.84 most the time, but will flux up to ~11.94, but rarely. however, it's been stooping down to 11.75 a lot lately. is that really really bad? or just kinda bad? my 5V rail sits 4.95, and my 3.3V rail sits at 3.21. will this all add up to random restarts and shut offs?
I am no expert on Power supplies but I don't think its really bad but if it gets any lower I should be a concern... If you want to be 100% safe exchange it or get a new one but I am sure you will be A- okay

Remember the Power supply is like the heart of the system and if it screws up it could take you're awesome graphics card, motherboard, and cpu with it..... But I think you should be good...

Please people comment if I'm wrong...
My System
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CPUMotherboardGraphicsRAM
3.0E E0 Presscott @ 3.85 P4P800 SE FX5500 256mb 128bit AGP 1GB DDR500 Gskill HZ 
Hard DriveOSMonitorPower
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My System
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CPUMotherboardGraphicsRAM
3.0E E0 Presscott @ 3.85 P4P800 SE FX5500 256mb 128bit AGP 1GB DDR500 Gskill HZ 
Hard DriveOSMonitorPower
200GB Sata1.5 Maxtor Windows XP Home & Ubuntu 19in Flat Panel 400w FSP-PN 
Case
Xoxide 5 in 1 combo 
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post #3 of 6
Thread Starter 
anybody?
post #4 of 6
From what I've read you really dont want the 12v rail to drop too far below 12 volts. 11.84 maybe but I think 11.75 is a little low. Your 5v seems good and 3.3 is about normal. Right now I have 12.13, 4.95, 3.35. Maybe try unpluging unessary things that use the 12v rail and see what happens...it might help.
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Main Rig
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CPUMotherboardGraphicsRAM
Q6600 Week 40 / E6850 Week 23 EVGA 680i SLI NF68-A1 EVGA 8800GTX Superclocked 2x 1GB Crucial Tracer Ballistix DDR2-1066 
Hard DriveOptical DriveOSMonitor
Striped Raptor 150's, Seagate 7200.10 750Gb LiteOn 16x DVD RW XP Pro, Vista Ultimate Mag 19 Inch 
KeyboardPowerCaseMouse
Logitech G15 OCZ 850W GameXStream Lian Li PC-777B Logitech G7 
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Steel Pad S&S 
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post #5 of 6
I think I read like more than 3 or 4% flux up or down is not good. Thats from 12v, so if it never gets up to 12v its even worse. My psu i just dumped dropped to 11.4v under full load, now, that was bad.
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36Gb Raptor Raid-0, 200Gb Maxtor Xp Home 19" Flat screen CRT Saitek Eclipse 
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OpterOWN
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Opteron 165 CCBBE 0610DPMW Asus A8N32-SLI Deluxe EVGA 7900GT 2GB OCZ EL Platinum 
Hard DriveOSMonitorKeyboard
36Gb Raptor Raid-0, 200Gb Maxtor Xp Home 19" Flat screen CRT Saitek Eclipse 
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OCZ Powerstream 520w Super Flower, with extension Some MS Optical 
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post #6 of 6
Quote:
Originally Posted by Tobuk
anybody?
+/- 5% is within spec, but remember, don't put too much faith in your software readings as actual voltage levels. If your psu is in question, measure it with a voltmeter or multimeter.
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Intel 2500k Asus P8P67 Galaxy GTX580 8GB G Skill Ripjaws 
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My System
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CPUMotherboardGraphicsRAM
Intel 2500k Asus P8P67 Galaxy GTX580 8GB G Skill Ripjaws 
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Intel 80 gb SSD, Raptor 150 Windows 7 Home Premium 24" Samsung LCD Saitek Eclipse 
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