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Power supply responsible for limited OC?

post #1 of 16
Thread Starter 
I've got the system in my profile mostly...

8 120mm fans, 1 140mm fan, a h100, 1 wd black drive, 2 wd raptor drives, 2 ssd drives, 1 dvdrw drive, 1 card reader, 1 external raid 5 array on esata(that is powered separately) and a radeon 5670 all connected to a sabertooth 990fx with a fx-8120 in the am3+ slot all powered by a hec zephyr 750. (that was a mouthful)

I listed all of that because I think my power supply is possibly being overloaded if I go to 1.4v on the VCore, the system instantly shuts down. To boot back up I must unplug the power, hold the power button for a few seconds, plug it back in and then turn it back on, no other way will work.

So... thoughts? Thanks

ps: when I do a search for this psu a black version comes up, my version has a chrome finish, idk if the are the same internally.

Edit: There are 4 sticks of 4gb 1866mhz ram in it too. I don't get any lag or blue screen or anything before it shuts off.
Edited by mattlb0619 - 6/8/13 at 1:17am
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post #2 of 16
Well, my system only has a 600w psu. and I am pushing it even at that.

So you having a 750w and it being far more loaded, i would possibly also point towards the power supply also.


EDIT: I suck at typing. lul
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post #3 of 16
Thread Starter 
Quote:
Originally Posted by Darqside View Post

Well, my system only has a 600w psu. and I am pushing it even at that.

So you having a 750w and it being far more loaded, i would possibly also point towards the power supply also.


EDIT: I suck at typing. lul

I don't know about that though..

You're using 2x 4870s which require external power the 5670 isn't as power hungry and I've only got one.
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post #4 of 16
Quote:
Originally Posted by mattlb0619 View Post

I've got the system in my profile mostly...

8 120mm fans, 1 140mm fan, a h100, 1 wd black drive, 2 wd raptor drives, 2 ssd drives, 1 dvdrw drive, 1 card reader, 1 external raid 5 array on esata(that is powered separately) and a radeon 5670 all connected to a sabertooth 990fx with a fx-8120 in the am3+ slot all powered by a hec zephyr 750. (that was a mouthful)

I listed all of that because I think my power supply is possibly being overloaded if I go to 1.4v on the VCore, the system instantly shuts down. To boot back up I must unplug the power, hold the power button for a few seconds, plug it back in and then turn it back on, no other way will work.

So... thoughts? Thanks

ps: when I do a search for this psu a black version comes up, my version has a chrome finish, idk if the are the same internally.

Edit: There are 4 sticks of 4gb 1866mhz ram in it too. I don't get any lag or blue screen or anything before it shuts off.

Your PSU is far from loaded.
I've once ran 2x 5830s in CF on my 600w PSU. Now i have a 3770K @ 4.6Ghz and a 7950 @ 1200/1300 and it's been running fine. You don't have to worry. Look at my "media center" pc in my sig. I've got all that running fine on a 320w PSU. And i tried overclocking the CPU to 3.2Ghz with a slight voltage bump, without any power-related issues.

Your system can't be drawing more than 400w.
Edited by tasospaok123 - 6/8/13 at 1:34am
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post #5 of 16
Thread Starter 
Quote:
Originally Posted by tasospaok123 View Post

Your PSU is far from loaded.
I've once ran 2x 5830s in CF on my 600w PSU. Now i have a 3770K @ 4.6Ghz and a 7950 @ 1200/1300 and it's been running fine. You don't have to worry. Look at my "media center" pc in my sig. I've got all that running fine on a 320w PSU. And i tried overclocking the CPU to 3.2Ghz with a slight voltage bump, without any power-related issues.

Your system can't be drawing more than 400w.

So why does it just turn off like that? I've seen fx-8120s with over 1.5v in them... and stable.
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post #6 of 16
Could be the PSU,just because it says 750w doesn't mean it's still actually capable of producing that wattage. PSU's do degrade over time and I assume it's fairly old. It can also be your motherboards overdraw protection kicking in. You may have to disable it to reach higher voltages. Your VRM's could also be getting too hot with an AIO W/C and a small case-most likely your VRM's are frying hot.You have to have airflow over the motherboards VRM heatsinks.
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post #7 of 16
Quote:
Originally Posted by mattlb0619 View Post

I've got the system in my profile mostly...

8 120mm fans, 1 140mm fan, a h100, 1 wd black drive, 2 wd raptor drives, 2 ssd drives, 1 dvdrw drive, 1 card reader, 1 external raid 5 array on esata(that is powered separately) and a radeon 5670 all connected to a sabertooth 990fx with a fx-8120 in the am3+ slot all powered by a hec zephyr 750. (that was a mouthful)

I listed all of that because I think my power supply is possibly being overloaded if I go to 1.4v on the VCore, the system instantly shuts down. To boot back up I must unplug the power, hold the power button for a few seconds, plug it back in and then turn it back on, no other way will work.

So... thoughts? Thanks

ps: when I do a search for this psu a black version comes up, my version has a chrome finish, idk if the are the same internally.

Edit: There are 4 sticks of 4gb 1866mhz ram in it too. I don't get any lag or blue screen or anything before it shuts off.

With my 750( i know not same model as u)

FX-8350@5ghz
2 x 660ti sc
4 200mm megaflow fans
5 sp120s high performance
1 stock xspc 120 fan
1 1400 exhaust fan
d5 pump
1tb hdd
2tb hdd

I must admit with it just shutting off if maybe its your psu and its either not very good or on its way out

that would be my first thought.

Have you tried running stock to see if it shuts off?

If it doesnt turn itself off, then u got options.....PSU at its limit, on its way out or bad overclock....it wont be temps cause of your h100 at that overclock
Edited by gertruude - 6/8/13 at 11:52am
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post #8 of 16
Quote:
Originally Posted by Redwoodz View Post

Could be the PSU,just because it says 750w doesn't mean it's still actually capable of producing that wattage. PSU's do degrade over time and I assume it's fairly old. It can also be your motherboards overdraw protection kicking in. You may have to disable it to reach higher voltages. Your VRM's could also be getting too hot with an AIO W/C and a small case-most likely your VRM's are frying hot.You have to have airflow over the motherboards VRM heatsinks.

+1 but I'll also throw in PSU's rated for a given capacity do not cram this wattage into the system - All it means is it's capable of that amount of output if needed.

PSU's like any other component are subject to heat and the effects of it along with age.
As a rule of thumb that I use, I over spec what I need for several reasons. One being to have a PSU running at or close to 100% capacity all the time isn't good for it. This causes it to run hotter and reduces it's lifespan overall.
There is also a matter of Vdroop - That's right, PSU's running at or close to the limit are more prone to have the system experience Vdroop under load esp under a load spike. If you have some extra capacity with your PSU this helps to offset this problem with the PSU being able to handle these changes in load demand as they occur.
All it takes is a single instance if instability to cause a crash or the like and a PSU capable of handling these changes in power draw/demand will help.

This along with a few other reasons is why if my setup needs for example 600W's to run, I normally go with a 750W or better PSU. I tend to figure in at least 100W over what I think I need but typically I go to about 200W, this way I know the PSU will not run too hot, it will last longer and the system's stability will be better too. As for the amount of power used, it's the same as it would be if I had gone with a PSU that would have been about what was needed and no more.

Again, PSU's do not simply cram wattage into a system, all they do is supply what it needs based on load/demand as it happens.
Edited by Kryton - 6/8/13 at 12:12pm
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post #9 of 16
If its the only PSU its the 12 Vregs going most likely. I had a 4 rail 12v PSU before and now i know why people prefer single quality rails; its probably a combination of the PSU and Mobo. The system is not using even close to 600w. Remove as much load from the system as possible with only the essentials; see if it will post and remain stable in OS (presumably windows) w/ the OC.
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post #10 of 16
Thread Starter 
I've been using this psu 24/7 since feb 2011.

www.newegg.com/Product/Product.aspx?Item=N82E16817339002

I am gonna shut down unplug the raptor drives, set defaults in bios boot back up then change the volts and see what happens.

edit:

It looks like I can set it to 1.4 as long as I do it in the bios, if I do it with the ASUS software in the OS it shuts down.

On a side note now that I have the power I need, the temp that shouldn't go over 60c is the core(package in hw monitor) temp not the cpu temp, correct?
Edited by mattlb0619 - 6/8/13 at 5:24pm
AMD FX-8120
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AMD FX-8120
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FX-8120 @ 4.2Ghz ASUS Sabertooth 990fx AMD Radeon HD 5670 G-Skill Sniper 1866Mhz 16GB 
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Samsung 830 128GB SSD ASUS DVDRW Corsair H100 Push-Pull 3x Cougar HDB 140mm; 2x Cougar HDB 120mm; 2x Fr... 
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