chobin Posted July 31, 2006 Posted July 31, 2006 hi there, this is the problem: i have watercooled two 6800 GT with a couple of DD MAZE4 low profile. of course i have copper heatsink on BGA. since my oc stared again on a SLI-DR Expert, i have a black screen randomly....and after a pc hang. when thi happends, i have to turn off the pc and start it again. if i do a hardware reset, it won't send any signal to card (monito in stand by)....but i can hear the window music for the start up....so basically the OS loads... the temperatures (core) in windows mode are around 44 °C (from 54/55 with stock coling). my fear is that the problem of those hangs is the overheating of the BGA more than some mobo issue. i tried with one card per time, with and withou SLI.....always the same thing..... another thing: i have a lot of weird COM+ errors in the event viewer...no clue what does it refer to...no info in Microsoft knowlede....but everytime is the same error. i got the same thing even when i was in the bios screen.... any clue? Quote Share this post Link to post Share on other sites More sharing options...
lowboy Posted July 31, 2006 Posted July 31, 2006 Have you verified stability of system ie memtest,OCCT,prime. Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 i was running Prime95 large FFT.....it was runnin smooth untill the black screen. it passes the firs loop and was going (i think) to complete the second.... i didn't try the memtest....do you think it could be a RAM issue? the same system was running ona DFI NF4 SLI-DR.....before the mobo decided to die from one day to another....so i bought his one saturday.... on the previous system i was runnin with the bus @224 witout any overvolt.....just releasing a bit the timings of RAM...the two vcard were running @1000/400 (OCed) Quote Share this post Link to post Share on other sites More sharing options...
lowboy Posted July 31, 2006 Posted July 31, 2006 I think you have settings off try OCCT 30min test is good to run before prime as it takes a shorter time to crash. Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 erm....i have no clue about what OCCT is..... and i don't hitnk i will have 30 minutes to test...usually crash in less than 6 minutes (just the time to listen to one mp3....or a bit more....) Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 erm....i have no clue about what OCCT is..... and i don't hitnk i will have 30 minutes to test...usually crash in less than 6 minutes (just the time to listen to one mp3....or a bit more....) google rulez:D :D Quote Share this post Link to post Share on other sites More sharing options...
lowboy Posted July 31, 2006 Posted July 31, 2006 Drop the OC and verifiy stabilty with tests and then follow the OC guide because you have a very unstable system. Good Luck Quote Share this post Link to post Share on other sites More sharing options...
Guest Retratserif Posted July 31, 2006 Posted July 31, 2006 I dont think the cards are really overrheating unless you have them OC'ed past what the Stock OC's are. Almost all BFG's are OC'ed to the maximum for the cooling they come with. You are adding Water to it. Giving it a little more head room. But the cards voltage may be its limits now. If you want to OC the cards past what they come with, you wil lhave to add more power. That will increase the heat a lot. I have a BFG 6800, and I keep it only slightly above the OC's it came with, because the fan it has on it, kind sucks. I never replaced it because it would take vold modding to go any further without crashing anyhow. I dont think its his systems OC thats doing. I think you are experiencing your crashes from to much OC on cards. Try to get in there and turn down the clocks on them. Mabye even remove the drivers if you cant get enough time to turn off the OC's. You have to test that to remove the Card's OC's from the issue. Quote Share this post Link to post Share on other sites More sharing options...
Uber-Noober Posted July 31, 2006 Posted July 31, 2006 While I cannot attest to whether you cards are overheating, with a temperature of 40C they are infinitely cooler than mine ever were. With stock heatsink my card often got up to 95C while playing Doom 3 in an air conditioned room (was rock stable mind you). That was with no OC. Yes, yes, case has excellent air cooling. Switched to Zalman VF700 and now my card load temp max is 80C. Still too hot for my liking but it tells me that no matter what, BFG 6800GT cards are little heat engines. If you have them at 40c then you are a lucky man IMO. What I did find that if I overclocked the cards to anything over 400/1100 then the performance dramatically DECREASED. Now I will most likely be smited from this forum for suggesting this, but it seems that too much OC on these actually hurts performance. Even on 420/1100 the card didn't report additional heat. Still 80C under load but my FPS went down horrendously. Therefore I think that you are trying to OC these cards too much and even with water cooling the 400/1100 is the optimum clock you'll get on these. Quote Share this post Link to post Share on other sites More sharing options...
chobin Posted July 31, 2006 Posted July 31, 2006 ok...here we are. the cards have just their own OC (from BFG). the problem was (as i thought) overheating of the BGA (RAM) i've put just a super-quite 120 fan blowing over the heatsink and the system is now up and running: 30 min with OCCT witthou problem and ran 2 times 3D mark 03 without problems nor artifact. using the watercooling....i have the DD MAZE4....it cools only the GPU, but for the ram chips i had to use some stupid square-like heatsinks.... i didn't add any other OC. i OCed with the stock aircooling (and yes it sux a lot)....able to slightly increase performances....but not that much....usefull only for the scoring....not really in gaming (at least no notice from mE) Quote Share this post Link to post Share on other sites More sharing options...
lowboy Posted July 31, 2006 Posted July 31, 2006 I got same block with the OCZ sinks but have fans everywhere.lol Never would have thought crash system in 5min when not playing though learn something new everyday.Good Luck Quote Share this post Link to post Share on other sites More sharing options...
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