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Overclocking 7970 and flickering textures/artifacts

post #1 of 7
Thread Starter 
So, I am performing the basic, simple overclock that every reviewer, at least, is saying the card can handle at stock voltage without a problem: 1125/1575 (cannot find a way to OC beyond that anyway). I know every card is different, but these reviewers also say the HD 7970 can overclock well beyond this without even having to adjust the voltage. Anyways, after the OC, I run FurMark fine with no artifacting for 15 mins. I run 3DMark 11 with no apparent problems, and Heaven with no apparent issues. However, after I load up a game (Portal 2, Witcher 2, Skyrim, BF3) they all eventually start doing a strange texture flicker on some elements of the environment. It doesn't happen immediately, usually after the game's run for a minute or two. The flicker is white usually, like the textures are disappearing and reappearing. Sometimes, I see a checkered pattern in the flicker. This does not occur when I remove the overclock. The max temp I usually get while playing with the OC is around 78 degrees. I have used MSI Afterburner to try changing the voltage higher, but the flickering still happens. Anybody else experiencing this issue while overclocking? Should I be worried or is there a chance this is just an issue with AMD's drivers? I really want to OC this card. Is there a chance I received a bad card that just doesn't like to be OC'd? If anybody has some insight to this problem, that would be awesome. Thank you.
post #2 of 7
Not all of the same GPU units can achieve the same level of overclocks.
I would:
update direct X via the online updater and install net framework 4. then run windows update afterwards.

Also install to the latest ati driver, or downgrade if your on the latest, to the next possible version.
OC via CCC. If you still get flickering, try OC'ing via msi afterburner. Make sure fan is on 100 to rule out bad temps. If this all fails, your card can't simply overclock and there is not much you can do.
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X79-GCN
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post #3 of 7
Thread Starter 
Well, I put my fan on 100% and sure enough, the artifacts were eliminated in Witcher 2 (all I tested right now) with the same OC and stock voltage. So, I guess my card was just getting too hot. I think it's my case's fault. In Furmark, it gets up to 85 degrees after 10 minutes. While playing a game, it gets to about 78-80 on stock clocks, and about the same while OC'd. Strange how that can happen. That's good news though. I just need to correct my air flow and I'll probably be good to go with an overclock. Hopefully I'm not wrong about it.

While I've brought my airflow up, I have a question maybe someone can answer. I have a mid-tower and my Zalman cooler has forced me to remove the fan from the side panel (no room). Would it be recommended that I seal that hole up in the meantime? I still have 2 120 fans, one at the back flowing out, and one at the front sucking in. This may seem like a dumb, no-brainer question, but please humor me.
post #4 of 7
Quote:
Originally Posted by Skoolz View Post

Well, I put my fan on 100% and sure enough, the artifacts were eliminated in Witcher 2 (all I tested right now) with the same OC and stock voltage. So, I guess my card was just getting too hot. I think it's my case's fault. In Furmark, it gets up to 85 degrees after 10 minutes. While playing a game, it gets to about 78-80 on stock clocks, and about the same while OC'd. Strange how that can happen. That's good news though. I just need to correct my air flow and I'll probably be good to go with an overclock. Hopefully I'm not wrong about it.
While I've brought my airflow up, I have a question maybe someone can answer. I have a mid-tower and my Zalman cooler has forced me to remove the fan from the side panel (no room). Would it be recommended that I seal that hole up in the meantime? I still have 2 120 fans, one at the back flowing out, and one at the front sucking in. This may seem like a dumb, no-brainer question, but please humor me.

i would close the hole up if you are worried about unfiltered air getting in. if you arent worried about dusty air being drawn into your components ( if your exhaust fans are drawing more air than your intake fans are pushing in -under the assumption your intake fans have some sort of dust screen - you will draw unfiltered/screened air from wherever possible. ) if you are not worried about your **** getting all dusty or what not. by all means leave it open. or mount your fan on the outside of your case if possible
post #5 of 7
The cards get unstable with heat... that is all
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post #6 of 7
I could run 1070 MHz 90c no problem.
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post #7 of 7
Quote:
Originally Posted by Skoolz View Post

Well, I put my fan on 100% and sure enough, the artifacts were eliminated in Witcher 2 (all I tested right now) with the same OC and stock voltage. So, I guess my card was just getting too hot. I think it's my case's fault. In Furmark, it gets up to 85 degrees after 10 minutes. While playing a game, it gets to about 78-80 on stock clocks, and about the same while OC'd. Strange how that can happen. That's good news though. I just need to correct my air flow and I'll probably be good to go with an overclock. Hopefully I'm not wrong about it.
While I've brought my airflow up, I have a question maybe someone can answer. I have a mid-tower and my Zalman cooler has forced me to remove the fan from the side panel (no room). Would it be recommended that I seal that hole up in the meantime? I still have 2 120 fans, one at the back flowing out, and one at the front sucking in. This may seem like a dumb, no-brainer question, but please humor me.


How big is the side fan hole? There are some slim fans available. Getting cool air to that card is pretty important.

 

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CM ATCS 840
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