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[Official] AMD Radeon HD 7950/7970/7990 Owners Thread - Page 821

post #8201 of 38701
Those of you having stability issues when overclocking, take these 2 things into consideration.

1) 7970s are VERY Temperature sensitive. It's best to keep the cards under 70C at all times when overclocking to maintain stability and avoid artifacting. It will require running the stock fans at rather high speeds, but it's the price you pay for wanting higher framerates, unless you want to watercool them.

2) Increase your memory voltage if you are artifacting or crashing in multi-card configs. Perhaps even try it in single card configs. I'm running 1.70v on the mem atm (the max), and it has helped reduce artifacts and BF3 stability and help me attain a higher OC.

Good luck thumb.gif
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post #8202 of 38701
Quote:
Originally Posted by m3t4lh34d View Post

Those of you having stability issues when overclocking, take these 2 things into consideration.
1) 7970s are VERY Temperature sensitive. It's best to keep the cards under 70C at all times when overclocking to maintain stability and avoid artifacting. It will require running the stock fans at rather high speeds, but it's the price you pay for wanting higher framerates, unless you want to watercool them.
2) Increase your memory voltage if you are artifacting or crashing in multi-card configs. Perhaps even try it in single card configs. I'm running 1.70v on the mem atm (the max), and it has helped reduce artifacts and BF3 stability and help me attain a higher OC.
Good luck thumb.gif

Thanks. I haven't even touched the memory yet but I have noticed a very high sensitivity to temps with these cards. Things are starting to come along though...

169
post #8203 of 38701
Quote:
Originally Posted by m3t4lh34d View Post

Those of you having stability issues when overclocking, take these 2 things into consideration.
1) 7970s are VERY Temperature sensitive. It's best to keep the cards under 70C at all times when overclocking to maintain stability and avoid artifacting. It will require running the stock fans at rather high speeds, but it's the price you pay for wanting higher framerates, unless you want to watercool them.
2) Increase your memory voltage if you are artifacting or crashing in multi-card configs. Perhaps even try it in single card configs. I'm running 1.70v on the mem atm (the max), and it has helped reduce artifacts and BF3 stability and help me attain a higher OC.
Good luck thumb.gif

how do you increase the memory voltage? also, my reference 7970's are different asics and different brands, is it imperative that i do their clocks (and accordingly voltages) separately in afterburner?
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post #8204 of 38701
Fresh install of o/s
updated everything
loaded 12.4 8.95.5
disabled ulps
reboot
added 12.3 CAPS
Reboot
loaded AB b.15
Reboot
added patch
reboot
enabled official ocz in config file
proceeding to test - updates tbd

runs ... plays bf3 a little better than before new install of o/s... but not as stable in unigine 1200 @1.237 1725 1.637 runs through it but a little artificting ...

RC11 had no artifcating on old o/s ... will test it out later

at least O/S is much snappier ...
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post #8205 of 38701
Quote:
Originally Posted by wirefox View Post

Fresh install of o/s
updated everything
loaded 12.4 8.95.5
disabled ulps
reboot
added 12.3 CAPS
Reboot
loaded AB b.15
Reboot
added patch
reboot
enabled official ocz in config file
proceeding to test - updates tbd
runs ... plays bf3 a little better than before new install of o/s... but not as stable in unigine 1200 @1.237 1725 1.637 runs through it but a little artificting ...
RC11 had no artifcating on old o/s ... will test it out later
at least O/S is much snappier ...

I've noticed that after doing that we gained a bit of smoothness for a little less fps. Rc11 ran a little faster but was choppier. I'm using 12.3 whql and it's a little slower than 8.95.5 . If you go back to Rc11, you will have to do a OS install again if you want to move back forward without issues. I couldn't launch any of my games once leaving Rc11 for the new drivers.
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post #8206 of 38701
Quote:
Originally Posted by Hambone07si View Post

I've noticed that after doing that we gained a bit of smoothness for a little less fps. Rc11 ran a little faster but was choppier. I'm using 12.3 whql and it's a little slower than 8.95.5 . If you go back to Rc11, you will have to do a OS install again if you want to move back forward without issues. I couldn't launch any of my games once leaving Rc11 for the new drivers.

I don't think its just rc11. On a fresh os, I was on 8.95.5 was running ok. I then went onto 12.4 beta(got greedy wanting the mlaa 2.0 lol), didn't like it so much had some clock synch issues between DP and DVI. I went to 12.3 whql, clock control issues, added files still wonky. Lo and behold, eyefinity in dx11 is now broke. All drivers now broke too in eyefinity, 8.95.5, 8.96.0, 12.3 whql. Bleh! I went back to rc11, she works again!

I'm not doing another fresh install till I get my 830s which is wed.
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post #8207 of 38701
So I just tried 12.4 beta again trying to get BF3 to run smoothly in Trifire, it seems I don't get the idle issue anymore where slave cards would be locked at 3D clocks. Maybe it was a bad install the first time?

12.4 beta + the latest CAP seems to smooth Trifire out pretty well for BF3 if anyone is having trouble.

About the ASIC discussion, I really dont know what to make of it. I have 2 cards at 80% ASIC, both default to 1.175v. My third card has a rating of 62% and runs at 1.05v, and its by far the coolest card. If I up the third card to 1.175v I can run them all at 1125 on the core. Seems to me like its a misleading/pointless figure.
Edited by Tslm - 4/1/12 at 11:25pm
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post #8208 of 38701
Quote:
Originally Posted by travva View Post

how do you increase the memory voltage? also, my reference 7970's are different asics and different brands, is it imperative that i do their clocks (and accordingly voltages) separately in afterburner?

anyone wanna answer these questions for me? it would be greatly appreciated, especially the second one.
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post #8209 of 38701
Quote:
Originally Posted by travva View Post

how do you increase the memory voltage? also, my reference 7970's are different asics and different brands, is it imperative that i do their clocks (and accordingly voltages) separately in afterburner?

Only if a particular card is sensitive to voltage adjustments when you test it on its own. As in in crashes due to any adjustment of voltage. I used to have that problem with ANY Powercolor 6950 or 6970s that I owned, and I've heard similar issues with 7970s, although not as widespread. I think perhaps they used proprietary vregs that didn't work well with 3rd party application adjustments.

You COULD determine the exact voltages that each card requires to hit "x" clock speed, but the thing is, once you crossfire them and the added heat and stress is introduced, those clocks and vcores will go out the window and you'll need to find all new clocks and voltages. If I'm going for super high clocks, I usually just run all 3 of my cards at the same voltage, as I know they wont crash from higher voltage, just produce more heat, which I counter with higher fanspeeds. I do that to reduce the variable of voltage and heat, and to simply find the maximum corespeed possible at the highest voltage. Then you can try reducing voltage until you have issues, and perhaps even tweaking each cards voltage if you can remember which card was your worst overclocker (required the most voltage, etc).

As far as memory voltage goes, there is a little down arrow by the vcore selector on MSI Afterburner. You simply click that and a little menu will come down where you can adjust the vMem voltage. As far as other 3rd party apps, I'm sure some of them have the functionality, but I haven't used them myself. I mainly only use MSI AB for it. Most 6970s didnt have memory voltage adjustments, so I never used it with my 6970s. Only lightnings and Asus Vtweak cards had it, but with the 7970 series, they all do.
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post #8210 of 38701
Thanks for that metalhead. Are your cards stable in BF3 at 1300mhz? Also, if you've tested BF3 with your 7970's, what instability symptoms do they show if they're unstable? When I mess with AB and try to OC my cards, they almost always cause a hard freeze after playing for some random amount of time.
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