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post #2871 of 3357
Quote:
Originally Posted by NicolasRush View Post

I bought two MSI 670 GTX PE/OC cards last year in October. I've finally decided to take the time to sit down and OC them. biggrin.gif I figured that it would be easiest to OC them individually since each card has its own boost value. So I have one card in my system at the moment, and while attempting to OC it, I worked my way up to a 142 MHz offset that gave a total boost clock of 1320 MHz, but the voltage isn't constant.. it tends to dip every now and then, even when forcing it to be constant through MSI Afterburner.. With the dips in voltage there tends to be some oscillation in the clock frequency.. Is there anything that I can do to fix this? Or should I ignore the oscillations and just keep slowly working my way up from the 142 offset? I should make a note that no matter what offset I use on this card there is always some oscillation in the GPU clock frequency, but the score in Heaven and the fps keeps going up. It's not my temps b/c the card never exceeds 59C.. thumb.gif It seems like the higher I go in core clock offset the more dips in voltage there are.... which tends to create oscillations in the core clock frequency graph.. redface.gif Any help would be greatly appreciated!

Stock bios with stock voltage of 1.175v or are you working with a custom bios?

1320 is pretty rockin for stock voltage! Another reason the card can throttle down is excess power consumption. What does the power usage chart look like around the dips down in voltage and core clock? And what is your max power target? Running at such a high clock it's gotta be taking quite a bit of power.
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post #2872 of 3357
Quote:
Originally Posted by michael-ocn View Post

Stock bios with stock voltage of 1.175v or are you working with a custom bios?

1320 is pretty rockin for stock voltage! Another reason the card can throttle down is excess power consumption. What does the power usage chart look like around the dips down in voltage and core clock? And what is your max power target? Running at such a high clock it's gotta be taking quite a bit of power.

Yes, its still on stock bios with stock voltage! biggrin.gif I have the slider in MSI AB pumped out to 100mV as per what the OC guide suggested.. and the aux slider is set to +30mV.. I don't think that these afterburner values actually increase the maximum load value voltage from what I have read in this thread thus far.. The max power target is set at 114%... Is that what your referring to? After this run finishes I will edit this post and update with a pic! thumb.gif
Interestingly enough this card only has an ASIC of 74.0%... biggrin.gif I always wondered if that number had any play in the OC of a chip.. rolleyes.gif

Update

It looks like that the core clock keeps fluctuating with dips in the GPU voltage... It is only throttling down to the lowest clock of 1280 throughout the entire heaven bench and it only happens when the voltage dropped to 1.137V... I'm not exactly sure why the voltage keeps dropping though.. I also just realized that when I was tinkering back and forth between EVGA Precision and MSI Afterburner before finally settling on Afterburner that I forgot to change the force voltage back to normal from within Precision.. I just re-installed Precision and removed the force voltage option in 2D mode.. That is why GPU utilization was showing as zero usage throughout the test..


Edited by NicolasRush - 10/15/13 at 9:51am
post #2873 of 3357
I see the wiggles. The "perfcap reason" display (if you can decrypt what its saying) in gpuz might help explain why the card is behaving that way.

I think you have a nice card, it runs at high clocks at stock voltage w/o using too much power. You're right to want to smooth out the clock and voltage lines and hopefully will find a way to do that. At some point you're going to want to give it some more mem clock too which will probably change power consumption again.

Out of curiosity, if you back off on the core oc such that it boosts to a max of 1306 instead of 1320... does it run flat or still wiggle?
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post #2874 of 3357
Quote:
Originally Posted by michael-ocn View Post

I see the wiggles. The "perfcap reason" display (if you can decrypt what its saying) in gpuz might help explain why the card is behaving that way.

I think you have a nice card, it runs at high clocks at stock voltage w/o using too much power. You're right to want to smooth out the clock and voltage lines and hopefully will find a way to do that. At some point you're going to want to give it some more mem clock too which will probably change power consumption again.

Out of curiosity, if you back off on the core oc such that it boosts to a max of 1306 instead of 1320... does it run flat or still wiggle?

It still wiggles... lowest was 1267 Mhz when voltage dropped to 1.137 V and power was at 103%... You think I should try to continue decreasing the core clock?
post #2875 of 3357
Quote:
Originally Posted by NicolasRush View Post

It still wiggles... lowest was 1267 Mhz when voltage dropped to 1.137 V and power was at 103%... You think I should try to continue decreasing the core clock?

Not really / maybe only to help figure out why its downvolting/downclocking. It's dropping down 3 boost bins (3 x 13) for some reason? I'd definitely want to understand the reason for that... its not temps and not total power usage. Were you able to make sense out of the "perfcap reasaon" display?

I doubt this would change anything, but i kinda wonder if running only one monitoring tool makes any difference? In your screenshot, you've got gpuz and ab going. What if you just run afterburner? I've read that multiple tools forces the sw stack into a less efficient way of monitoring these values.
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post #2876 of 3357
Quote:
Originally Posted by michael-ocn View Post

Not really / maybe only to help figure out why its downvolting/downclocking. It's dropping down 3 boost bins (3 x 13) for some reason? I'd definitely want to understand the reason for that... its not temps and not total power usage. Were you able to make sense out of the "perfcap reasaon" display?

I doubt this would change anything, but i kinda wonder if running only one monitoring tool makes any difference? In your screenshot, you've got gpuz and ab going. What if you just run afterburner? I've read that multiple tools forces the sw stack into a less efficient way of monitoring these values.

I will try it here with just the AB monitoring utility... As far as the perf cap reason.. it seems that the operating voltage and the reliability voltage are the key culprits... There is some total power limit on the monitor too tho.. Let me try just running AB and see if anything changes...

Update
Okay.. It seems to me that the culprit is the reliability voltage. The core clocks only drop when there is a decrease in voltage... Not once on the entire benchmark did the clock drop when it wasn't voltage related.. I'm not sure why I can't get constant voltage to the card.. Do you think that maybe if I flashed a custom bios to increase voltage output that it might increase the reliability voltage? Nothing improves when I tell AB to force voltage either.. It just keeps fluctuating.. mad.gif

Well I just tried forcing voltage again and this time there was a pretty significant improvement in the consistency during the beginning and the clock consistency also improved.. This just confirms my suspicions that the issue is indeed voltage related..
Edited by NicolasRush - 10/15/13 at 12:03pm
post #2877 of 3357
Sorry, i don't know the details about vRel and what that really means or how you can get it to not trip on vRel?
http://www.techpowerup.com/forums/showthread.php?t=184430
http://www.tomshardware.com/answers/id-1733130/gigabyte-gtx-670-power-target-stays-issue.html
Quote:
Originally Posted by NicolasRush View Post

... maybe if I flashed a custom bios ...

I think that kinda completely changes the game and is entirely dependent on just what bios you flash. I personally don't know squat about that, it voids warranties and such, and I kind of like overclocking w/o overvolting as a general strategy anyway to avoid damaging things. I take the path of least resistance smile.gif Plenty folks here do flash custom bios's with state of the art liquid cooled setups and go gangbusters with insane OCs.

However if vRel is tripping somehow due to noise or not enough juice from the PSU not sure a new bios would help with that? What kind of PSU do you have out of curiosity?
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post #2878 of 3357
Quote:
Originally Posted by michael-ocn View Post

However if vRel is tripping somehow due to noise or not enough juice from the PSU not sure a new bios would help with that? What kind of PSU do you have out of curiosity?

Currently I am using a NZXT 1200 watt HAL V2 power supply. It's brand new and I installed it last month. I was able to successfully OC my i2700K to 4.9 ghz with hyper threading enabled and keep relatively low temperatures with a 16 hour stability prime 95 test using 90% of all available ram. I would seriously doubt it to be a power-supply issue, but then again I have been wrong before.. lol..
post #2879 of 3357
Quote:
Originally Posted by NicolasRush View Post

Currently I am using a NZXT 1200 watt HAL V2 power supply. It's brand new and I installed it last month. I was able to successfully OC my i2700K to 4.9 ghz with hyper threading enabled and keep relatively low temperatures with a 16 hour stability prime 95 test using 90% of all available ram. I would seriously doubt it to be a power-supply issue, but then again I have been wrong before.. lol..

Is it just Vrel you get or do you get VRel and VOp in CPUz? I both of these when my card is running optimally and nothing else is stopping the overclock. I think it implies that it is the highest you will get for that clockspeed/boost.
post #2880 of 3357
Quote:
Originally Posted by Deders View Post

Is it just Vrel you get or do you get VRel and VOp in CPUz? I both of these when my card is running optimally and nothing else is stopping the overclock. I think it implies that it is the highest you will get for that clockspeed/boost.
It is a mixture of VRel and VOp... There seems to be quite a bit of power mixed in the graph as well. I don't understand why the voltage throttles though.. It seems to do it more frequently the higher in clock that I go, but the card overall is still pretty stable at 1320 boost.. It just has some small throttling occurring...
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