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6600GT SLi Problems

post #1 of 37
Thread Starter 
Whenever I enable SLi mode in the NVIDIA control panel the screen si fine for a few minutes then it will flash blank and come back, screen doesn't refresh properly sort of blinks then eventually it will die and give me a blank screen and monitor light goes orange but PC stays on?

I thought it was to do with my PSU, it's a 350W so I unplugged all the stuff and it now onlt has 2 disk drives and a DVD-RW plugged in - no other fans or drives. There is a space on my mobo where you plug a disk drive connector it two power the graphics.

The card which was primary I think is damaged, yesterday I turned on the PC after shutting it down to do some stuff inside, don't remember what but nothing which could of damaged it, when I turned it back on all the text letters for the loading screen were like squared n stuff and basically it wasn't displaying the image properly so I swapped the cards round and used the other for my primary card.

The PSU 12 rail is 18A on + and 0.8A on - was told 18 aint quite enough for SLi? Well have ordered a 600W anyways but what do you guys reckon is going on here?
    
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post #2 of 37
I'm running dual 6800's and have a 400PSU. I can't overclock both the CPU and PSU's due to power shortage. It sounds like that is a big issue for you. I would also run ati's artifact finder to see if there is a display problem with your cards. Lastly, when my monitor goes to standby (orange light) it's because I am asking for a resolution which is unsupported, check it.
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post #3 of 37
Thread Starter 
Hmm resolution is set at 1280x1024x32 at 75Hz I'm running a 20" Dell flat panel find it hard to believe monitor or those cards wouldn't support the res?

I wouldn't even have a chance to use the artifact finder once I enable SLi in the space of about 30-45 second it flickers occasionaly like the screen will go blank and then come back and everytime it goes blank it is a longer period of time before it comes back then eventually it will go blank and not come back altogether, I have to restart then disable SLi the moment I log on.

If the card is damaged, what could have caused this? If it was me playing around inside then it could only have been static electricity but i'm pretty sure I only touched the edges of the cards, if I had of touched the mem chips could if have damaged it in the way I'm describing? I'm really confused about what's goin on in all honesty.
    
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post #4 of 37
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post #5 of 37
Did you check your bios to see if the sli settings are enabled or on auto??..Also maybe try uninstalling the drivers and run driver cleaner found here if you don't have it then reboot and reinstall

~~edit~~ can you use only one of your rails for the SLI plug only and run the rest off another??
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post #6 of 37
it deffently sounds like a power issue...or maybe ur sli connector is bad...thats about the only thing i can think of...
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post #7 of 37
This is a power supply problem,do not expect a 350 watt to run sli,never ever what soo ever it will NOT run sli,not overclock sli,and not nothing,as far as i can remember 6600gt's have a power plug,that means they run on more then like 100 watt
soo lol.get a better psu = problem fixed
    
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post #8 of 37
My 6600gt's only have the sli bridge no power connector...The only connection is a molex on the board ...so that is plugged in and I have the pci frequency set to 108
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post #9 of 37
Thread Starter 
Cards don't have connectors for power, they are the XFX ones, the PSU has 18A @ 12v rail which is actually very good for a 350W, turns out the 600W my dad just bought only has 17A on 12v rail!

the whole system has been reformatted, and it is running the latest drivers.

dotcomthese your mobo is an ASUS but it's probably very similar to my giga

edit: Also I'm not sure PSU would explain why the primary card appeared to be damaged when I powered on my PC? When I made the other card primary the display was working as normal.
    
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post #10 of 37
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