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OC'ing my 480 to 900 mhz, computer shuts down.

post #1 of 26
Thread Starter 
Been trying to get past my 850 Mhz core limit with voltage cranked. Can't seem to get past that.

I'll post voltages in a bit when I get home but I'm wondering if this sounds like insufficient power? I have quite a bit on my supply as you can see from my sig so if you have any advice it would be appreaciated (Rep'd).


I have 5 hard drives, 3 video cards and a blu ray burner in case I left anything out of my sig. =3
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D-1000
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post #2 of 26
you should be fine with power. Once I put my cards in SLI my highest overclocks were not as good either. the highest I could get on air was about 856Mhz
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post #3 of 26
the psu should take it......how many fans are you running?
    
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post #4 of 26
trying OCing individually?
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post #5 of 26
maybe uninstall that 9600 GT?
btw GTX 480 rarely reaches 900...but you're underwater so i'm not sure.
if it's PSU overload, ur whole pc would have shut off.
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post #6 of 26
Having the PC completely shut down on heavy load is a classic symptom of what happens when one of the PSU's protection circuits kicks in and shuts it down. Of the possibilities, the overcurrent protection would be the most likely candidate, meaning, yeah, your system is drawing too much power off of it.

Simplest way to test obviously, would be if you could get your hands on a higher wattage/better quality unit on loan, just to test the hypothesis?

Otherwise ... how does your +12V circuit look in terms of voltage before this happens? You might want to test it using a program that can automatically log the voltage on each rail, stamping it into a text file every second or so ... this way when the PC shuts down you'll have a record of exactly where the 12V was at when it happened.

If you're rock solid at 12V, it's pretty likely to NOT be the PSU causing it. If you're dipping to 11.5V or below when it crashes, I'd be very suspicious.

Speedfan is one app that can do this logging (with most motherboards), but there may be some others ... Everest probably does too
    
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post #7 of 26
slightly OT. you're loosing performance by having that 9600 gt as Physx. your 480's can handle physx better without a lower end card aiding them.
     
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post #8 of 26
Thread Starter 
Quote:
Originally Posted by EpicPie View Post
slightly OT. you're loosing performance by having that 9600 gt as Physx. your 480's can handle physx better without a lower end card aiding them.
I need the 9600gt for two other monitors. ^_~ I would put it on the 480's just not sure which option to select under physx, cpu or 480 and should I dedicate it to physx?


Here is a screenshot of speedfan voltages. It looks like I might be falling short.
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D-1000
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post #9 of 26
900mhz is easier to achieve on a gigabyte gtx 480 soc although the windforce cooler is at it's limit
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post #10 of 26
Had the same issue with me. Dual 480's stock speed fine. When I overclocked to 815core it shut off. Switched my old antec 1000w for a new one and bam. Good to go. Been running my current setup no worries.
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