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6850 acting a little flakey

post #1 of 8
Thread Starter 
helloooooooo OCN

I just built a little PC for my parents and the thing is running great. I figured I would do one last upgrade and give them my old 6850 since it is just collecting dust in my closet. I had to take a water block off the card and put back on the stock cooler, which was no big deal. I redid the TIM on the GPU and put some thermal tape on the memory (almost positive the mem had tape on them) and seated the stock cooler.

I put in the card (and plugged in the power connector) and was able to boot into windows, but after about 1-2 mins on the desktop, the PC reboots. It did this about 5 times in a row, so i went to the bios to scope things out. After being in the bios for about a min i noticed blacks dots all over (in linear patterns, not random) the background.

I was thinking maybe I missed something on the gfx card when taping and applying TIM, but I was pretty thorough. I then thought perhaps it's the PSU since its pretty small and only has 18A on +12V1 and +12V2. I used http://www.extreme.outervision.com/psucalculatorlite.jsp and came up with only needing about a 350w PSU. I am torn between the PSU and the TIM application, but am almost leaning towards the latter.
also forgot to mention the amb temp in the room is quite low, so there def are no heat issues in general.
Before I take the cooler back off and find a computer store around here for paste & tape, i would like to get some other opinions.


specs:
Mobo - msi 760PM-G34
CPU - AMD 4100 black
HD - Toshiba 1TB
PSU - coolermaster RS-460
DVD drive
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post #2 of 8
Thread Starter 
bump,
also am using a DVI to VGA adapter. just incase that has anything to do with it. usually i would never use these, but their monitor is older.
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post #3 of 8
Thread Starter 
pulled the cooler off and everything looked covered. any suggestions....please?
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post #4 of 8
Well, it could still be the PSU. Wattage does not directly correlate to amperage. I know it'd be a PITA, but you could always pull out your own PSU and test it in that system to see if it's still having issues. If it is, it's the GPU, if it's not, it's the PSU. Guaranteed solution.
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post #5 of 8
Thread Starter 
Quote:
Originally Posted by Flames21891 View Post

Well, it could still be the PSU. Wattage does not directly correlate to amperage. I know it'd be a PITA, but you could always pull out your own PSU and test it in that system to see if it's still having issues. If it is, it's the GPU, if it's not, it's the PSU. Guaranteed solution.

understood and ty for the input,
my only real issue is that i am out of town doing this build so i am extremely limited in time and supplies. usually i would just test every option no problem, but I have no spare parts here frown.gif another reason i'm begging on OCN lol
maybe i can run over to the only PC store around here and just pick up a PSU. odd that the card worked flawlessly when i took it out and it just sat in a box till now. I also pulled the cards cooler and everything looks good and covered with TIM or tape.

it is odd that when the 6850 is installed the system boots to windows/desktop, shows a few white horizontal lines (against a black desktop) and then just reboots w/in about a minute. w/o the 6850 though, it rips thru everything including gaming (tested the onboard video with SWTOR) always somethin new in this hobby rolleyes.gif
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post #6 of 8
How old is the card, Im running CF 6850s and the oldest one started causing the same problem.
Had to heat gun the ram chips to get it to work with out restarting every 3-5mins of windows, (that was about 2 months ago)
post #7 of 8
Thread Starter 
Quote:
Originally Posted by bmgjet View Post

How old is the card, Im running CF 6850s and the oldest one started causing the same problem.
Had to heat gun the ram chips to get it to work with out restarting every 3-5mins of windows, (that was about 2 months ago)

huh, that's quite interesting and ty for the input. my 6850 is prob about ~2 years old now, but was only used for maybe 1/2 of that. it sat in the box for the other half. it was also on water pretty much the day i got it (not that that matters much). was the heat gun for warming the solder pts on the card?

i was playing around a bit more and realized that the internal grafx driver was showing an error in the device manager and had some random VGA driver showing up in the advanced settings. I removed then reinstalled the "on-board" drivers & CCC and now everything's reading normal. I am pretty sure I removed all the CCC stuff before installing the 6850, but maybe that was the whole problem. Think i might just try to install the 6850 drivers w/o removing the "onboard" stuff.
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post #8 of 8
Mine have been on water most the time as well,
Ram chips have always sat around 55-60C under load while rest of the card has been under 50C.

I just heated up the whole ram chips moving in a L shape pattern (how they are places)
Then let them cool back down over 20mins, stuck card back in and it was good.

Ram use to over clock to 1150mhz but it only manages 1025mhz now and any higher crashes explorer and windows theame but games still run with gfx glitches if launched though task manager.
Cores are also a bit degraded, Use to do 1050mhz on both, Now the newer card (2 years only does 1000mhz and the older one 3 years does 940mhz)

Been good cards tho, just wish the 8000/700 series of cards would hurry up and come out so I can get a single card replacement with more grunt and then cf/sli after 6-12 months.
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