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~~The GTX 670 Overclocking Master-Guide~~ - Page 195

post #1941 of 3357
I just recently got a Forsa GTX680 reference design and Im pretty new to this Kepler overclocking...

Im using MSI-AB Beta 3.xx , would it be safe to leave the Power Limit (%) to 132? I would suppose this is 32% for the other tools, I also have the core clock at +130 while memory clock at +400.. My custom fan settings include the fan to ramp up to 75% when it hits 67c. for several runs with heaven 4.0 it only hits about 60c

My question is though there are times when I change the coreclock to another value and my core clocks for both cards will drop and peg at 1006Mhz, is this normal?

Also my bottom card is always 13Mhz higher, is this also normal ?
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post #1942 of 3357
I don't overclock GPUs anymore but thought this might be a good place to ask a question on my new GPU.
http://www.evga.com/Products/Product.aspx?pn=04G-P4-2673-KR

Last night I ran this GPU for about 90 minutes with 100% load (rendering) and according to MSI Afterburner it was running at 1147mhz which is higher than my boost and loading to 61C. Do these numbers look right? Why would it clock higher than EVGA says the boost is? The fan never went above 30%. So I'm thinking I either have overclocking headroom, or the ability to make it cooler and quieter.
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post #1943 of 3357
Quote:
Originally Posted by seithan View Post

Also, while i boosted the clock by an additional 20Mhz, from +120 to +140, the actual gain was 13Mhz

The results buffle me. In every case, there is a decrease in perfomance even comparing with to the +120Core @ 1176

Im not sure what happening but its just strikes me wierd.

So the conclussion is:

On my machine, a 2500k @ 4kGhz , the GTX670 perfoms better with +120 core compared to anything else. There is a neglible gain when boosted to +140 core, but only on the max FPS, with an actual decrease in the min FPS.

Higher frequencies resulted to no gain or even decreased perfomance.

My post http://www.overclock.net/t/1265110/the-gtx-670-overclocking-master-guide/1920#post_19501357 explains some of what you were experiencing.
Edited by brandon88tube - 3/14/13 at 10:07am
post #1944 of 3357
Quote:
Originally Posted by sepheroth003 View Post

I don't overclock GPUs anymore but thought this might be a good place to ask a question on my new GPU.
http://www.evga.com/Products/Product.aspx?pn=04G-P4-2673-KR

Last night I ran this GPU for about 90 minutes with 100% load (rendering) and according to MSI Afterburner it was running at 1147mhz which is higher than my boost and loading to 61C. Do these numbers look right? Why would it clock higher than EVGA says the boost is? The fan never went above 30%. So I'm thinking I either have overclocking headroom, or the ability to make it cooler and quieter.

the 1046mhz evga clais on specs is minimum boost. EVERY card boosts to different levels under load. that is the reason everyone is told to list their max boost clock under load. you may have headroom galore or you ay have 13mhz headroom on core. you may have 50mhz or 600mhz headroom on memory. neither clock has a specific max frequency. gotta love kepler...
just follow the guide if you decide to overclock it. and from what i heard, the 4gb cards dont overclock as well. no idea on the validity of this statement.
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post #1945 of 3357
Quote:
Originally Posted by EarlZ View Post

I just recently got a Forsa GTX680 reference design and Im pretty new to this Kepler overclocking...

Im using MSI-AB Beta 3.xx , would it be safe to leave the Power Limit (%) to 132? I would suppose this is 32% for the other tools, I also have the core clock at +130 while memory clock at +400.. My custom fan settings include the fan to ramp up to 75% when it hits 67c. for several runs with heaven 4.0 it only hits about 60c

My question is though there are times when I change the coreclock to another value and my core clocks for both cards will drop and peg at 1006Mhz, is this normal?

Also my bottom card is always 13Mhz higher, is this also normal ?

It's safe to leave it at 132%, the card will still only draw what it needs.

Not sure why it would drop the clcok speeds like that - sounds like it is disabling the overclock or something. Does restarting Afterburner fix it? I have seen my card get stuck in a low power state (526 MHz) but never from changing settings.

It's normal for th cards to boost to different levels - you should be able to adjust the offset for the lower card to bring it up to the same speed, or you can try the sync cards control but I'm not sure that really works.
post #1946 of 3357
nope syncing wont work. it only sets the offsets the same for both cards, or at least to my cards.
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post #1947 of 3357
Quote:
Originally Posted by pc-illiterate View Post

the 1046mhz evga clais on specs is minimum boost. EVERY card boosts to different levels under load. that is the reason everyone is told to list their max boost clock under load. you may have headroom galore or you ay have 13mhz headroom on core. you may have 50mhz or 600mhz headroom on memory. neither clock has a specific max frequency. gotta love kepler...
just follow the guide if you decide to overclock it. and from what i heard, the 4gb cards dont overclock as well. no idea on the validity of this statement.

Thanks, I was reading through more of the guide. Seems keplar really is a strange beast.
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post #1948 of 3357
Quote:
Originally Posted by brandon88tube View Post

My post http://www.overclock.net/t/1265110/the-gtx-670-overclocking-master-guide/1920#post_19501357 explains some of what you were experiencing.

Hi, i read your post before and found it interesting. Although it doesnt answer why i was getting lower perfomance or no perfomance gain at all with higher clocks.
post #1949 of 3357
Quote:
Originally Posted by Forceman View Post

It's safe to leave it at 132%, the card will still only draw what it needs.

132%? are you talking about the Power Limit % slider in MSI AB? Mine goes to +22% at max setting, although i see +30-34% on the MSI overlay, when running games.
post #1950 of 3357
Quote:
Originally Posted by brandon88tube View Post

I would like to share some test results I've gathered and hopefully help people understand some points that were not really covered in the original guide. If it proves useful, then hopefully it could be added to the original.

I will probably update this with a better explanation, but for now I'll just dump the info I've gathered.

The goal of this is to hit the "sweet spot" on the GPU Clock. I call the "sweet spot" the point at which you raise your GPU Clock just enough that it hits that next incremental point and raises your Max GPU Clock. The problem is that there is a range at which you get a certain max and will stay at that point until you hit the next incremental point or "sweet spot". So, even though you may have added ~12MHz to your GPU Clock or more, you are actually not seeing any return. All you're really doing at that point is making it more likely to be unstable and maybe even raise temperatures if you have reached your max offset. So, my idea is to do a quick test to see how much you need to offset the GPU Clock in order to get to the next boost point. It should be between 12-14MHz for each increment, but the numbers at which they do so may vary on each card. Then from there, take what you believe to be your highest STABLE GPU Clock offset, see what the Max on the GPU Clock is and then adjust your offset to be at the "sweet spot" for that MHz range.

EDIT: I figured I should give an example to make my rambling a little more understandable.

Example: Let's say the MAX STABLE offset I can get on the GPU is +129 MHz resulting in a Max GPU Clock of 1241 MHz. According to my tests, I should drop that to +118 MHz instead because from +118 to +130 MHz I'm getting exactly the same Max GPU Clock and it will never go higher until I go with an offset of +131 MHz.
Code:
EVGA GTX 670 Reference Board:
=============================
Stock GPU Clock: 915 MHz
Stock Memory Clock: 1502 MHz
Stock Boost: 980 MHz
Stock Max GPU Clock: 1124 MHz
Stock Kepler Boost: 144 MHz
BIOS: 80.04.19.00.70

Driver/Software:
================
Driver: 314.07
GPU-Z: 0.6.8
EVGA Precision X: 4.0.0


Max GPU Clocks (GPU Clock Offset):
==================================
+000 MHz = 1124 MHz <- Stock
+013 MHz = 1137 MHz
+026 MHz = 1150 MHz
+039 MHz = 1163 MHz
+052 MHz = 1176 MHz
+065 MHz = 1189 MHz
+078 MHz = 1202 MHz
+091 MHz = 1215 MHz
+105 MHz = 1228 MHz <- Notice 14 MHz increase
+118 MHz = 1241 MHz <- Heaven 4.0 immediately crashed
+131 MHz = 1254 MHz
+144 MHz = 1267 MHz
+157 MHz = 1280 MHz <- Heaven 3.0 immediately crashed

Kepler Boost Amounts (GPU Clock Offset):
========================================
+000 MHz = 144 MHz
+012 MHz = 132 MHz
------------------
+013 MHz = 144 MHz
+025 MHz = 132 MHz
------------------
+026 MHz = 144 MHz
+038 MHz = 132 MHz
------------------
+039 MHz = 144 MHz
+051 MHz = 132 MHz
------------------
+052 MHz = 144 MHz
+064 MHz = 132 MHz
------------------
+065 MHz = 144 MHz
+077 MHz = 132 MHz
------------------
+078 MHz = 144 MHz
+090 MHz = 132 MHz
------------------
+091 MHz = 144 MHz
+104 MHz = 131 MHz <- Beginning of boost drop
------------------
+105 MHz = 143 MHz
+117 MHz = 131 MHz
------------------
+118 MHz = 143 MHz
+130 MHz = 131 MHz
------------------
+131 MHz = 143 MHz
+143 MHz = 131 MHz
------------------
+144 MHz = 143 MHz
+156 MHz = 131 MHz
------------------
+157 MHz = 143 MHz


Now for the memory... well I don't understand it enough yet, nor have I done enough testing, but if someone would like to help me out with that please let me know. It would be nice to find a good incremental number like 13MHz is for the GPU Clock.

I've noticed this as well. For the longest time, I was wondering why sometimes my Kepler boost would come out to not be a multiple of 13 while other times it would be dead on. It had me wondering what my true Kepler boost was because it would come out to be anywhere between 117 and 130 MHz. Well, when I am on one of these "sweet spots" my Kepler boost always comes out to be 130 MHz.

It turns out that for my particular card, these "sweet spots" are at +131, +144, +157 and +170 offsets (maybe more but I haven't tested outside these yet).
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