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PSU took a dump, have some questions.

post #1 of 13
Thread Starter 
So today I get home from work and find my computer off and come to the conclusion PSU has taken a dump. I can't get fan to turn on and when I finally got it to boot to windows AIDA voltages were not right. I know they are probably not 100% accurate but they were close to what the voltage should have been. Now they are the following: +3.3V is 6.048 V; +5 V is 3.570V; +12V is 4.343V.

Anyway it is 950W quad rail with 20A on +12.1 and +12.2 and 25A on +12.3 and +12.4. The replacement that has caught my eye is only 750W but all 4 rails are 40A. Is a 750 at the higher amperage close to equal in power as the 950W or am I thinking about this all wrong. For some reason in my head I feel that 750W @ 40A should be close to or equal to 950W @ 20A. Is that theory totally inaccurate?

Comp is currently the sig rig but I always try to leave room in PSU for upgrade. Planning on 6970 (possible xfire) unless 7000 series comes out sooner then i buy. Thoughts?

Thanks in advance.
post #2 of 13
AX850 or a AX750 would be good Gold rating very good efficiency
or even seasonic x-750 or x850
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post #3 of 13
You must be using software monitoring. If those readings were accurate then your computer would not be running.

That particular Coolmax unit can't label its rated wattage and gets crazy ripple at high loads but with your setup, you aren't even getting close to its max. What I'm thinking is, that power supply is way too overkill for your system. Power supplies don't run well when under 15% load, which it probably is when idling. You really only need like an Antec Earthwatts 430 for that setup, and even the 430 would handle it no problem and you'd still be able to do a decent graphics card upgrade down the line
Edited by Pentium-David - 11/3/11 at 10:56pm
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post #4 of 13
Thread Starter 
Quote:
Originally Posted by Pentium-David View Post
You must be using software monitoring. If those readings were accurate then your computer would not be running.
Correct. AIDA is what is reading those voltages. I know they seem crazy goofy but they used to be close. 3.3 would read 3.4ish. 5V was always around 5V and the 12V would read 12.4ish. So i figured something is goofy for them to read crazy all of a sudden and putting 2 and 2 together with the fan not working makes me thing this PSU is junk. Is there a write up for a better way to test it?

Also is there any truth to the 750W 40A PSU being close to a 950W 20A PSU? Looking to head to micro center Friday to pick up this Antec to replace the 950W I have now.

I just want to make sure I'll have enough power (I figure I will for what I have now) but like I mentioned, I'm planning on upgrading to at least one 6970 if not CF 2 of them.
post #5 of 13
Thread Starter 
Quote:
Originally Posted by Pentium-David View Post
You must be using software monitoring. If those readings were accurate then your computer would not be running.

That particular Coolmax unit can't label its rated wattage and gets crazy ripple at high loads but with your setup, you aren't even getting close to its max. What I'm thinking is, that power supply is way too overkill for your system. Power supplies don't run well when under 15% load, which it probably is when idling. You really only need like an Antec Earthwatts 430 for that setup, and even the 430 would handle it no problem and you'd still be able to do a decent graphics card upgrade down the line
Wow. 450 seems crazy low. I have never been told something like that before. The eXtreme PSU calculator I use for rough idea even says 590W recommended for my setup with one 6970 instead of CF 5770s. Two 6970s has it at 786W recommended and that's not including things like maybe another HDD or SSD. Is this calculator just that inaccurate?
post #6 of 13
Well, the BIOS would have a more realistic reading for voltages than software monitors, but nothing beats a digital multimeter. That Coolmax is pretty much an average 600W unit with a 950W sticker on it. Even if it worked I would NEVER run 2 6970's on that PSU. That Antec power supply is awesome, and would work well but is still slightly overkill. If you wanted to save some money, you could get a 650W from Antec or Corsair. And the website PSU calculators always overestimate, 590 is ridiculous for your current build. So, 430 if you want your current setup for a while, and a 650W if you want to run Xfire 6970's in the future. HDD and SDD use almost no power...and any power supply up in the 600's and higher has plenty of power on the 5V rail, which is what your hard drives would use. The main thing is total 12V output, which is what your processor and graphics cards use
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post #7 of 13

Cant you send the unit in for RMA? If you think the psu is fickly.


Be sure that the psu is going bad. I bought one also when my psu fried.

However a 750w Should be plenty enough for any card to be crossfired or sli. Unless it is 580 or 6990 in quad.
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post #8 of 13
Quote:
Originally Posted by AMD_King View Post
Wow. 450 seems crazy low. I have never been told something like that before.

Well, IMO a 430W would be kind of shoehorning it for an OC'd quad with HD5770s in Crossfire. I'd go for any good 500-550W, or a tad higher if you're planning on CF or SLI with higher end cards some time in the future.
Edited by Smirnoff - 11/4/11 at 3:12am
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post #9 of 13
Thread Starter 
Im sure this is a noob question but will the power output from the wall (watts) be different from psu to psu or does the system pull x watts no matter the psu?

Sent from Vibrant Bionix 1.36GHz
post #10 of 13
Oh I didn't realize you had crossfire 5770's. but still, a 500 or 550W would be fine for that, 5770's don't pull that much power. Regarding your other question, yes different power supplies pull a different amount of power from the wall. Low end power supplies use more power because they are inefficient, usually in the high 60's and 70's. Not only does it waste power and raise your bill, it creates a lot of heat....You should at least shoot for 80 Plus, which is pretty much in every quality power supply that's manufactured now. Usually the lower end ones, like that Coolmax don't have very good voltage regulation, so the power wouldn't be as "clean" as say, from a high end Antec PSU. In really bad circumstances PSU's can cause freezes and random restarts.

I used to have a crappy PSU with Fuhjyyu capacitors in my server, and it pulled around 80W from the wall according to my Kill-a-watt. When I switched to my Antec EA380 (80 PLus Bronze) it then pulled a little over 60W from the wall. Dropped the electricity bill a tad...and it doesn't kick out any heat at all
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