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~~The GTX 670 Overclocking Master-Guide~~ - Page 266

post #2651 of 3357
I think that those dips are indicative of going to high in the mem clock (based on logs we've seen in this thread in the last couple of days)... my guess is that 3515 is too much for it.
Quote:
Originally Posted by SIDWULF View Post

This is @ 3151 max boost memory.

See where it dips? Sometimes heaven gives accurate scores...sometimes the scores are much lower...when the scores are accurate there is no dip...Is this evidence of too high memory clock?
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post #2652 of 3357
Quote:
Originally Posted by Forceman View Post

It looks from that log file that the card is just power limited (all the 1s in the power column). You can see where it downclocks and downvolts for power for significant periods, even going as low as 1.137V for significant lengths. Have you tried leaving the clocks at stock but turning the power limit all the way up?

Here's my log file - you can see it only hits the limit a couple of times.
gtx 680.xlsx 17k .xlsx file

That was his card at stock settings with the power target set to max.
post #2653 of 3357
Quote:
Originally Posted by brandon88tube View Post

That was his card at stock settings with the power target set to max.

In that case I'd look at modding the BIOS for a higher power limit.
post #2654 of 3357
This is my max stable clocks in the format of the guide. I followed the guide exactly but had to adapt things to my situation.

EVGA GeForce GTX 680 2GB
1202 MHz Boost Clock
1241 MHz Max Boost
3510 MHz Memory
132% Power Target with default voltage slider

Created with GIMP
Created with GIMP

A few issues:

1) My "POWER TARGET" slider only goes up to 132% I have seen people set it higher. Why is this?
2) Increasing the "GPU CLOCK OFFSET" by 1MHz does not change the Max Boost until you hit a certain *magic* number and then the Max Boost will jump up ~10+Mhz. The "MEM CLOCK OFFSET" actually works and changes with every +1MHz increment. Why is this?
3) My highest "FAN SPEED" is 85% and my lowest "FAN SPEED" is 30%. why is this limited? How do I increase fan speed over 85%? Will it damage the fan? The guide wants me to use 20% and 100% nodes at certain temperatures.
4) The Heaven 4.0 benchmark shows different Memory clocks compared to Precision X Performance log and it doesn't show Core clocks. Why is this?
5) The "VOLTAGE" window appears to do nothing and I can only max it to 1150mV instead of 1.1750V which the guide suggests. Why has NVIDIA limited this? Does the slider actually do anything?
5) When I increase "MEM CLOCK OFFSET" past a stable value my video card will show lower scores after ~1-3 Heaven runs. I have never seen memory related artifacts from a high memory clock in Heaven 4.0, just lower scores. Is this normal behaviour? As you can imagine running ~1-3 loops of Heaven for each "MEM CLOCK OFFSET" increase is very time consuming.
6) Its is 27 Degrees Celsius ambient temperature in my room and I notice my card goes over 70 Degrees Celsius during the day time up to a max of 73 Degrees Celsius while running Heaven. Meanwhile the fan is running at 85% and it down clocks the core 13MHz. At night time when ambient temperatures are lower my card hovers around 68 Degrees where is should be. Why is my card doing this? Did NVIDIA optimize this card only for room temperature?

Sorry for all the questions. Just quite a few oddities while following this guide. I am happy with the clocks I achieved. smile.gif
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post #2655 of 3357
Quote:
Originally Posted by SIDWULF View Post

This is my max stable clocks in the format of the guide. I followed the guide exactly but had to adapt things to my situation.

EVGA GeForce GTX 680 2GB
1202 MHz Boost Clock
1241 MHz Max Boost
3510 MHz Memory
132% Power Target with default voltage slider
A few issues:

1) My "POWER TARGET" slider only goes up to 132% I have seen people set it higher. Why is this?
2) Increasing the "GPU CLOCK OFFSET" by 1MHz does not change the Max Boost until you hit a certain *magic* number and then the Max Boost will jump up ~10+Mhz. The "MEM CLOCK OFFSET" actually works and changes with every +1MHz increment. Why is this?
3) My highest "FAN SPEED" is 85% and my lowest "FAN SPEED" is 30%. why is this limited? How do I increase fan speed over 85%? Will it damage the fan? The guide wants me to use 20% and 100% nodes at certain temperatures.
4) The Heaven 4.0 benchmark shows different Memory clocks compared to Precision X Performance log and it doesn't show Core clocks. Why is this?
5) The "VOLTAGE" window appears to do nothing and I can only max it to 1150mV instead of 1.1750V which the guide suggests. Why has NVIDIA limited this? Does the slider actually do anything?
5) When I increase "MEM CLOCK OFFSET" past a stable value my video card will show lower scores after ~1-3 Heaven runs. I have never seen memory related artifacts from a high memory clock in Heaven 4.0, just lower scores. Is this normal behaviour? As you can imagine running ~1-3 loops of Heaven for each "MEM CLOCK OFFSET" increase is very time consuming.
6) Its is 27 Degrees Celsius ambient temperature in my room and I notice my card goes over 70 Degrees Celsius during the day time up to a max of 73 Degrees Celsius while running Heaven. Meanwhile the fan is running at 85% and it down clocks the core 13MHz. At night time when ambient temperatures are lower my card hovers around 68 Degrees where is should be. Why is my card doing this? Did NVIDIA optimize this card only for room temperature?

Sorry for all the questions. Just quite a few oddities while following this guide. I am happy with the clocks I achieved. smile.gif

1. Different cards have different power limits, and you can also change (increase) it by modding the BIOS.
2. The CPU clock works on 13 MHz steps, so you need to increase the offset enough to reach the next step.
3. You can change the fan limits by modding the BIOS.
4. Heaven and Valley often read weird clock speeds though usually memory is right. Not sure why yours wouldn't be showing core clock at all though.
5. You can only increase the voltage through BIOS mods. It was limited to protect the chips and power draw. The slider does nothing useful.
5. At some point the memory will start generating errors, which the built-in error correction has to correct, which causes lower performance. If you get reduced performance, you've gone too far with the memory overclock.
6. The cards will throttle the clock speed by 13 Mhz at 70C and again at 80C. That's normal.
post #2656 of 3357
Im running SLI and I've experienced several times for the bottom card to throttle even if its 60c. Dont really know why.
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post #2657 of 3357
Quote:
Originally Posted by EarlZ View Post

Im running SLI and I've experienced several times for the bottom card to throttle even if its 60c. Dont really know why.

Post this and I will try to help you smile.gif

A short, concise, explanation of your general problem.

Your card's model
Your Boost Clock
Your Max Boost (This is your Boost Clock + Kepler Boost)
Your Memory Clock
Your Power Target and Voltage setting


Your Heaven score and a screenshot of the graphs after that same Heaven run. If you were unable to finish Heaven then mention that instead.
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post #2658 of 3357
1st time overclocker here, never really screwed with this stuff much. Pretty much followed the Short/Quick method and backed off at the slightest sign of instability. Running 2x EVGA 670 FTW's. Let me know what you guys think.










Edited by subsven - 7/10/13 at 6:22pm
post #2659 of 3357
Quote:
Originally Posted by subsven View Post


First of all...max Heaven out and then post scores.
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post #2660 of 3357
Quote:
Originally Posted by SIDWULF View Post

First of all...max Heaven out and then post scores.

I set everything as high as I could.
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