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Enough power to AGP card?

N

Nathelion

Senior member
Hello everyone!

I'd need some help determining the cause of lock-ups and crashes for my eVGA geforce 6800 GS copper-edition. I got it a week or so ago, and it ran fine. Then I started overclocking. From an initial 400/1100 on 1.4 V I got it to a stable 460/1220 on 1.44V. Then I decided to try and unlock the 4 pixel pipes and the extra vertex shader and brought it down to 400/1100 again in order to do so. It worked fine, I had no artifacts, but.. whenever I try and OC the core again the screen goes a fuzzy red/green pattern and it doesn't work right until I reboot. I've tried upping the voltage to 1.46, but no effect. The 6800 GS has one Molex power connector attached.
I'm wondering, since I am trying to bring it rather close to Ultra specs, and the Ultra requires two power dongles, is it possible that it's simply not getting enough juice? I've made sure that it is the only device attached to its cord. My PSU is a 400W Antec, I have a P4, 1GB of RAM (DDR1, dual channel), 2 cd-rom drives, 2 SATA hard drives, one IDE hard drive, a network card (if it matters), and a PCI RAID controller. Am I potentially exceeding the limits of the power supply?

Also, if someone is good at OCing... How high do I dare bring the voltage on the graphics card? I'm a little bit uncomfortable keeping it at 1.46 since this is the first time I've voltmodded a card, and I'm not exactly sure what the tolerances are....
 
The manufacturers disable the other 4 pipelines for a reason. More than likely they weren't able to take the excess overclocking. Also, it's more likely your video card can't reach ultra speeds, so even though there is enough power, I doubt the core and memory can take the pressure.
 
^ what he said

Ultra speeds arent guaranteed anyway, so if you really can unlock it without any artifacts I would be happy with that. 🙂

I was about to get one of those today, but when I got to mwave they said it was OOS... no realtime stock tracking. 🙁
 
Originally posted by: Nathelion
But how comes I was able to overclock it to such a great extent before I unlocked the pipes and not after?
Click to expand...

Because those 12 pipelines can withstand a higher overclock than those pipelines that were disabled.
 
I see. I've experimented some more...
I locked the pipelines again and overclocked to 450/120. Then I stressed the card and monitored it in rivatuner. The odd thing is, the graph for the voltage regulator current keeps jumping up and down, going as high as 40.3 amperes. (there were several 40.3 peaks, none that went higher, some that went lower). 40 amperes? Is that really normal?
 
I had a spike of 130 A during testing. Is the monitoring tool going haywire? I don't think my PSU can supply that kind of juice... and if it could, wouldn't the card be fried by now?
 
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