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Kepler overclock: Is setting minimum GPU Voltage adviseable to eliminate throttling (and FPS fluctuations)?

post #1 of 2
Thread Starter 
Hey all,

In this pic there are 3 windows:

2njhxtl.jpg

The lower left window has 5 little graphs on it.

The second line is the Gpu clock. While it peaks at the boost I set it to in Asus GPU tweak (1293mhz) as you can see it drops it down sometimes aswell (to default 1058). This happens in sync with the graph below it (GPU voltage).

Now I make sure to use a custom fan profile so that the card NEVER hits 70c (so that it will not auto throttle by itself). Yet it's apparently still happening.


The default minimum voltage for this card (according to ASUS Gpu Tweak is 0987 (mV).

But if you click the little "G" in Asus GPU Tweak (which stands for Gaming) you'll see the Minimum GPU Voltage ramp up to 1024 and scale according to the Clock you set.

On mine it scaled the minimum voltage to 1025 (mV) when I set the core to 1190. So thats what I set it to. So now this "throttling" is fluctuating between 1025 and 1175 (the default for kepler).

I'm wondering whether or not to just set the min. GPU voltage to 1175 (mV) that's the normal these cards run at so there should theoretically be no throttling right?


I love this card but it is driving me crazy, sometimes I can't see the difference between stock and overclocked when looking at FPS values at certain places in like AC:IV Black Flag, and other times with the same settings it will be 5-10 fps faster. I know it's not because of temp throttling as I never let it go above 69c. Maybe it's ECC error correction on the agressive memory timings I set, but when I drop those down it still fluctuates FPS without me having altered the clocks between runs at all. It's weird.



ASUS CUII GTX 670 TOP

+53 Mhz core (1190 core set in GPU tweak (GPU-Z shows 1297mhz))
+632 Mhz Memory (7272 mem set in GPU tweak (sometimes I use 6430 as I literally cannot tell the difference in games)

Min GPU voltage 1025
Power target 117%
Custom fans to always keep the card under 69c.


Q9650 @4.5
8GB DDR3 1800
Edited by gold333 - 11/22/13 at 10:44am
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post #2 of 2
Thread Starter 
I solved it!!!

You most definitely DO need to set the minimum GPU voltage in GPU Tweak / EVGA Precision or MSI Afterburner.


I cant believe what a difference it makes, the 670 feels twice as fast now!


So before... using AC4: Black Flag I used fraps to take a note of precise fps in certain places, like at the loading of a mission when not moving. I.e. right on load.

It used to vary alot, like once it would load at 45fps then another time at 39, then peak at 65 the second time around, etc, drove me nuts. All without me changing anything in settings or clocks. (and I run a tight system, all unneeded services disabled, defragged, FSW, no reduntant services, printspoolers, etc. so it didn't make sense to me.)


The problem was that when I overclocked the 670 TOP to my own values of 1190 core and 7272 memory I had left the Minimum GPU voltage at the standard ASUS GpU Tweak Gamer setting of 1025 mV.

Now checking all the data, my fps fluctuations were exactly when the GpU voltage fluctuated between 1025 mV and the normal load value of 1175 mV!


So what I did was set the GPU Tweak minimum voltage to 1150 (it wouldn't let me select 1175 for some reason).

Now, like magic the fps is constant! Every single time I load the reference location it is at 65fps. No matter what I have running. The game went from fluctuating between 33-65 fps arbitrarily to a constant 55-65 fps! It's like another card or something. Amazing how setting the minimum voltage to prevent fluctuations could make such a difference. I've been playing AC4 (maxed 1920+TXAA) and stock the 670 top was like 25 fps when it rained, etc. Real nasty. I never knew removing the GPU voltage fluctuations between 1175mV and whatever you choose as the minumum would let it run 55-65fps throughout.


Now 2 questions remain:


1. ASUS Gpu tweak only lets me set the minimum voltage to a max of 1150mV. You'd think the fluctuation between 1150mV and 1175mV, so 0.025V would mean nothing. But I correlated the Boost graph and that 0.025 drop in voltage everytime corresponds to 156mhz core. So the boost now fluctuates between 1293mhz and 1137mhz. A lot better than before (1025 mV - 1175mV) but still it is a random 4 fps hit on the game now and then. Is there any way to set the minimum voltage (when gaming atleast) to 1175 on these cards?


2. Is there any chance of damaging these cards when running them at 1175 (or 1150 for the time being) when gaming?




Thanks alot guys, yesterday I didn't even know the difference between core and memory and I never knew how to overclock a gpu.
Edited by gold333 - 11/22/13 at 3:06pm
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CPUMotherboardGraphicsRAM
Q9650 E0 (1.2 VID) @ 4.07 Ghz Asus Striker II NSE ASUS GTX 670 CU II Top 8gb DDR3 Corsair 1750 9-9-9-24-1T P1&P2 Enabled 
Hard DriveOptical DriveOSMonitor
Western Digital Caviar Black 1TB None Windows 7 64 40inch 1920x1080 
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