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post #931 of 3890
Hi!
I seem to be limited in my overclocking endeavors with my 6950s by the fact that they're not getting enough juice. So my question to you all out there; how does one get more than the 20% extra power that CCC will supply through power-control settings?
I am currently running a shader unlocked asus bios on my 6950s, which i modded with RBE to run at 1.275 volts (have used as high as 1.35 for testing) and overclocking with CCC (unlocked by smartdoctor). Highest stable values i've seen (not failing any of these benchmarks; heaven, furmark, metro 2033 and occt) are 1040 core and 1500 memory. However at those values they throttle quite a bit in occt and furmark extreme burning mode, as it seems they're not getting enough power. Another user (tsm106 thanks for all your input already) here suggested measuring powerdraw, but i'm not gonna be able to do that just yet, so i was wondering if anyone had any good ideas on how to get more power to the cards.
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post #932 of 3890
You'll probably have to hard mod the GPU to get more out of it. Someone on the forum have tested Afterburner voltage control and the 6950 is software limited to 1.35v. He used a multimeter to test the voltage. I believe the throttle your experiencing is due to power tune (I think that's what it's called). So far no one knows how to turn it off but there is an alternative way. MSI Afterburner have an option to force constant voltage which should prevent the throttle, though I'm not to sure. Give AB a try and see how that goes.
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post #933 of 3890
Quote:
Originally Posted by DaRookie View Post
You'll probably have to hard mod the GPU to get more out of it. Someone on the forum have tested Afterburner voltage control and the 6950 is software limited to 1.35v. He used a multimeter to test the voltage. I believe the throttle your experiencing is due to power tune (I think that's what it's called). So far no one knows how to turn it off but there is an alternative way. MSI Afterburner have an option to force constant voltage which should prevent the throttle, though I'm not to sure. Give AB a try and see how that goes.
Thank you! I'll give that a try.
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post #934 of 3890
Ok, i tried turning off CCC and using afterburner with forced constant voltage. It is obvious that CCC has at least to some extent something to do with the throttling, however it seems there's more to it than that. When overclocking in CCC, OCCT and furmark extreme burning starts the throttling, and it varies depending on the power-control settings used in CCC. When forcing the overclock with afterburner to (in this case) 1000mhz core and 1400mhz memory @ 1.275v i seem to run into a wall with occt where gpu usage drops to 12% on gpu 1 and 0%(!!) on gpu 2 although clocks remain stable, and it seems to be putting out 540 some fps during the benching. I'm wondering if there's a monitoring software issue with afterburner (as it seems to put out good fps) or if there's another reason for the apparent drop in gpu usage. However, the furmark extreme burning runs at full gpu usage and no fluctuations in clocks. This leads me to a couple of conclusions at this point.
1. Afterburner monitoring/Gpu-onboard monitoring signal is flawed at higher than specced output.
2. OCCT loads the gpu so severly that there's no remedy for the issue, but as this won't happen in real life situations like gaming there's no problem anyways as long as one uses afterburner for forcing the overclock.
3. My PSU simply runs out of juice at a point when load gets high enough using OCCT, although i find this highly unlikely.

What do you all think?
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post #935 of 3890
So I finally managed to successfully unlock my Sapphire 6950 after about 6 hours of fiddling (Windows refused to boot several times) and I've got a couple of questions:

1) Is it normal that my card is running at 500/1375 even when it's idle? The GPU temp is about 61C (~28C ambient), which I think is a bit hot. Can I safely lower these clocks in RBE? I do have two monitors connected.

2) How exactly do I overvolt the GPU? I tried entering 1.25v in the drop down box under "Clocks" for the 880/1375 setting, but that somehow led to a corrupt BIOS. I later tried changing only the voltage under "voltage registers" but GPU-Z still reports 1.175v. Am I supposed to change the voltage under both settings?
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post #936 of 3890
Quote:
Originally Posted by aznofazns View Post
1) Is it normal that my card is running at 500/1375 even when it's idle? The GPU temp is about 61C (~28C ambient), which I think is a bit hot. Can I safely lower these clocks in RBE? I do have two monitors connected.
No, that's not normal, at least not for any extended amount of time. No, you can not change any clocks successfully (to my knowledge) at this point in RBE when editing a 69** series bios. Only voltages may be changed.

Quote:
Originally Posted by aznofazns View Post
2) How exactly do I overvolt the GPU? I tried entering 1.25v in the drop down box under "Clocks" for the 880/1375 setting, but that somehow led to a corrupt BIOS. I later tried changing only the voltage under "voltage registers" but GPU-Z still reports 1.175v. Am I supposed to change the voltage under both settings?
If you changed the voltages in the gpu registers settings, and successfully loaded the bios, the voltages have in fact been changed. GPU-Z reads the voltages from the second bios on your card (or so it seeems) so voltage changes does not show up in GPU-Z. Try checking with afterburner, which should read the actual voltage. I only know that what i stated is true if you edited a unlocked shader 6950 bios, not if you used a 6970 bios.
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post #937 of 3890
Quote:
Originally Posted by EndWar View Post
Ok, i tried turning off CCC and using afterburner with forced constant voltage. It is obvious that CCC has at least to some extent something to do with the throttling, however it seems there's more to it than that. When overclocking in CCC, OCCT and furmark extreme burning starts the throttling, and it varies depending on the power-control settings used in CCC. When forcing the overclock with afterburner to (in this case) 1000mhz core and 1400mhz memory @ 1.275v i seem to run into a wall with occt where gpu usage drops to 12% on gpu 1 and 0%(!!) on gpu 2 although clocks remain stable, and it seems to be putting out 540 some fps during the benching. I'm wondering if there's a monitoring software issue with afterburner (as it seems to put out good fps) or if there's another reason for the apparent drop in gpu usage. However, the furmark extreme burning runs at full gpu usage and no fluctuations in clocks. This leads me to a couple of conclusions at this point.
1. Afterburner monitoring/Gpu-onboard monitoring signal is flawed at higher than specced output.
2. OCCT loads the gpu so severly that there's no remedy for the issue, but as this won't happen in real life situations like gaming there's no problem anyways as long as one uses afterburner for forcing the overclock.
3. My PSU simply runs out of juice at a point when load gets high enough using OCCT, although i find this highly unlikely.

What do you all think?
I'm no expert but don't use CCC to overclock since power tune will kick in and throttle the GPU, this you already experience. You still need to increase power control in CCC when overclocking with AB, this will help stabilize the overclock/GPU.

1.Afterburner monitoring software could be flaw since it's in beta stage and the 69xx is fairly new.

2. OCCT is overkill. Furmak and MSI Kombuster are all useless for stress test. They're only good for finding max temperature. Best stress test is to run Crysis benchmark 30-50 loops and if you pass then you're stable.

3. I doubt it's your PSU.

4. Could possibly be a crossfire issue... might want to look into this.
Edited by DaRookie - 2/16/11 at 1:51am
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post #938 of 3890
Quote:
Originally Posted by DaRookie View Post
I'm no expert but don't use CCC to overclock since power tune will kick in and throttle the GPU, this you already experience.

1.Afterburner monitoring software could be flaw since it's in beta stage and the 69xx is fairly new.

2. OCCT is overkill. Furmak and MSI Kombuster are all useless for stress test. They're only good for finding max temperature. Best stress test is to run Crysis benchmark 30-50 loops and if you pass then you're stable.

3. I doubt it's your PSU.

4. Could possibly be a crossfire issue... might want to look into this.
Thank you! I already had suspicions that CCC wasn't ideal at oc'ing due to powercontrol, but now i have the proof i needed. The only reason i used CCC to begin with is that it allows for automatic 2d and 3d clock/voltage switching, even in crossfire mode. Afterburner only applies the profiles for 2d/3d to the card which is selected in the program at the time of the change. If there's a solution for the clock-switching issue in AB, please educate me.. And i will start using the Crysis benchmark more so than the ones i have already, the only reason i used OCCT and furmark was to maximize voltage use to get an idea if and when throttling would become an issue. I guess the results are in on that one already, so no need for any more of that. Thanks for the help so far, sending a +rep your way.
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post #939 of 3890
AB allow 2d/3d clock voltage switching.

Apply the clock and voltage and save it from #'s 1-5

Go to AB settings, profiles, under "automatic profiles management" you'll see 2D/3D profile. Select the clock/voltage you just save for 2D & 3D then apply.

Thanks for the rep
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post #940 of 3890
Quote:
Originally Posted by DaRookie View Post
AB allow 2d/3d clock voltage switching.

Apply the clock and voltage and save it from #'s 1-5

Go to AB settings, profiles, under "automatic profiles management" you'll see 2D/3D profile. Select the clock/voltage you just save for 2D & 3D then apply.

Thanks for the rep
Yea, i know that's how i do that, it just doesn't apply the correct profiles to both cards at once when switching from 3d to 2d. It only applies the profiles to the card which is "selected" in AB, and the other card stays at 3d profile.

Edit:
Actually i found a solution. Using Sapphire Trixx keeps the standard 2d clocks and switches both cards fine, as well as keeps the stock voltages i edited into the bios using RBE, so i guess that's a win for me..
Edited by EndWar - 2/16/11 at 2:15am
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Overclock.net › Forums › Graphics Cards › AMD/ATI › [Official] AMD HD 69xx Owners Club