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Got an issue here...

J

JCNiest5

Supreme [H]ardness
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Apr 25, 2005
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Okay, so I was using this PSU forever (well, since I bought it anyway) and didn't care to check on the 12V rail when loaded. Now, I got an EVGA GTX285 to play with and whenever I do a 3DVantage testbench using the default setting, it would run the test without any problem, but IF I change the resolution setting to 1920x1200 (max res my LCD monitor can support), my PC snaps and just completely does reboot of its own during the Jane Nash scene. I can hear a "tock" click, then the PC just reboots. Upon restarting, it would get back on the Desktop and I check the 12V reading, it's 11.70V and when I run RTHDRIBL to torture the video card, it would go all the way down to 11.53V. Is this wayyyyy too low for the 12V rail? Is that what is causing my PC to reboot? I should get a better PSU if that's the case.

The PSU is a Logisys 650W with 22A on 12V1 and 12V2 rails (total 44A). The ampere should be fine AFAIK but I think the problem may be the low 12V rail when loaded, though.

Just want someone with a better knowledge of voltage chime in so I know what to do with this PSU.

TIA...
 
Talking about new PSU, is the Enermax Revolution85+ 1050W good? I read many good reviews on it...what's your experience with it so (if you have one)?
 
For the ATX specification, the maximum variance of the 12v rails are 5% iirc.

Normal: 12.0v Max: 12.6v Min: 11.4v

It's hard to tell how stable it is though from simple readings, and there may be a lot of irregularities on the rail causing your pc to crash.


As for the Enermax PSU, all their PSU's are top notch, and those are particular good.
 
I'm going to swap it with the PSU from the other PC (Thermaltake PurePower 680W) and see if I can get it to stabilize. The 12V rail on the other one stays at around 12.25V loaded (although it's powering a 9600GT instead of a GTX285), but it's worth a try.
 
Swapping a different PSU with better 12V rails does the trick. Now, I can pass the whole benchmark program without any crash. So, the 12V does play a big role in this issue. Hope someone also benefits from reading this post. Thanks you guys (and gals)...
 
12v rails play a major role in power everything in your system. CPU's voltage regulators step the 12v rail down to whatever the CPU requires, GPU's, optical drives, and hard drives also have to have a stable +12v source, else they won't run right, if at all.

I'd highly suggest getting rid of that Logisys. There's no telling who really made it, but it was probably the lowest bidder. Also, any Thermaltake except the Toughpower series is junk as well.
 
JCNiest5 said:
I check the 12V reading, it's 11.70V and when I run RTHDRIBL to torture the video card, it would go all the way down to 11.53V.
Click to expand...
Check with what? If you're using software, ignore the readings. Trust only a digital multimeter to give you an accurate picture of your voltages.
JCNiest5 said:
The PSU is a Logisys 650W with 22A on 12V1 and 12V2 rails (total 44A).
Click to expand...
Logisys = bad. Ditch it ASAP and purchase a quality PSU as soon as you can. You won't regret it.
JCNiest5 said:
Talking about new PSU, is the Enermax Revolution85+ 1050W good?
Click to expand...
It's arguably the best PSU you can buy right now, at least in North America.
 
Zero82z said:
Check with what? If you're using software, ignore the readings. Trust only a digital multimeter to give you an accurate picture of your voltages.
Click to expand...

Checked the reading with both software and a digital multimeter instrument. Both are very close so it must be correct.

Right now, the Logisys PSU is in the case of the other PC. Running anything that loads up the PC, it maintains a 12.15v reading, so I guess this PC just uses too much power for the Logisys to handle. The Thermaltake PurePower is fructuating between 11.97v, 12.06v and 12.14v (vs. Logisys 11.70v and 11.53v) when tortured. The T'take is much better than the Logisys that I was using for this PC. I guess it's really time to move on to better PSUs. Just wanna make sure it's the absolute must do thing, that's all.
 
JCNiest5 said:
Checked the reading with both software and a digital multimeter instrument. Both are very close so it must be correct.

Right now, the Logisys PSU is in the case of the other PC. Running anything that loads up the PC, it maintains a 12.15v reading, so I guess this PC just uses too much power for the Logisys to handle. The Thermaltake PurePower is fructuating between 11.97v, 12.06v and 12.14v (vs. Logisys 11.70v and 11.53v) when tortured. The T'take is much better than the Logisys that I was using for this PC. I guess it's really time to move on to better PSUs. Just wanna make sure it's the absolute must do thing, that's all.
Click to expand...

Even if you were having no problems, moving to better PSU's is a must do. Cheap PSU's are cheap for a reason. They will almost always bite you in the ass.
 
I originally saw the Enermax Revolution85+ at Amazon.com for $277.99, didn't pull the trigger and now it's $323.99, OUCH! Gonna wait just a bit longer to see if it would come down again. Dang it....I should've ordered a few days back when it was still cheap.
 
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