Overclocking GTX 660 Beyond 1228.5 MHz

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008Rohit

008Rohit

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Anyone ever managed to OC a GTX 660 above 1228.5 MHz? There's a hard limit of 1.212V on the core voltage and the max my card can take at that voltage is 1228.5 MHz.

It's also unable to utilize more than 110% of TDP despite me unlocking it to 150% using Kepler BIOS Tweaker.

This OC'ed setup is giving me around 70-80 FPS in GRID 2 (1080p, maxxed). Earlier I was getting around 55-65 FPS. I'm happy nevertheless.
 
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D
hey thought i might chip in i too got gtx 660 twin frozr III running SLI
did you try to use the MSI Afterburner freeware it works pretty well with 660 can also open the core voltage in settings if needed
i do agree that that is an insanely high mhz ratio your running for that card i upped mine with
+140mhz core clock and +400mhz memory clock if you leave the voltage disabled there is a power limit % option that is pretty failsafe
that is running on 110 (10%) boost it runs very smooth ofc it might be different with your system and i am running sli, good thing about this program is that it also synchronize with any other card you might have installed or wish to install later
not that i wanted to do any commercials for any programs :D...
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008Rohit

008Rohit

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It actually has a core clock of 993 MHz and boost clock of 1097MHz. I've got the Synergy edition. Temp levels are okay, I unlocked the fan speed so that it can reach 100% when needed. The max. temp I got was 75C and it was 72C before the OC. Ambient temps here are around 37-39C. I'm getting an air conditioner in the room in a couple of days as well, so that should help.

So, in your opinion, 1228.5 MHz is great for the card? :)
 
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008Rohit

008Rohit

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Even if it runs cool? I couldn't experience any instabilities during gaming, either.

EDIT:

I'm getting around 45-48 FPS avg in BF4 and 38FPS min. Almost GTX 670 level performance.
 
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blockhead78

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that seems like an excessively high clock

are you sure you're reading the figures correctly?

Don't just count on games running ok as being a signs that your overclock is stable.

I use furmark and Fire strike in 3dmark to benchmark my 2 x 660 overclocks and the max clock I can apply where both furmark and 3dmark do not crash is:
Core clock: 1099mhz
Mem clock: 1695mhz
Fan speed: 80%
Power: 100%

Quite like that I've currently got the top result for my combination of CPU and GPUs
http://www.3dmark.com/fs/2114295
 
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envy14tpe

envy14tpe

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I have never allowed my GPU to exceed 70C and 60% fan speed. If you are really able to run at that clock speed then I highly suggest you back it down a bit. 100% fan speed must be a turbine engine. Also, if you do this a lot you are quickly reducing the lifespan of the 660.
 
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008Rohit

008Rohit

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Say, I reduce the frequency down to 1100 MHz but the voltage stays the same, does it make the condition any better for the GPU or the voltage is all that matters and I should extract every single MHz possible out of a fixed max. voltage? I haven't had much experience in GPU overclocking.
 
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blockhead78

blockhead78

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if you can get a stable clock without upping the voltage, then use that as your benchmark

If your GPU can run at 1100mhz stable without a voltage bump, then that would be ideal, as applying the bump would be unnecessary and would just add heat

The best thing is to initially see how far you can get the card (in small increments of 5-10mhz) before it crashes or gets too hot. Don't take big jumps in the clock settings or your just asking for problems, baby steps.

Use benchmarking programs at each overclock change (furmark, 3dmark, unigine valley/heaven) and monitor the temps

If any overclock setting crashes/overheats, drop the clock back down until it's stable again.

Once you've got a max stock voltage overclock that can pass those benchmark programs without crashing, if you want to get more out of it, you can up the voltage slowly and start upping your clock with 5hz increments and continuing the whole benchmarking process again.

Personally, I don't like adding too much extra voltage to GPUs, so don't go too far with it.
 
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Deangelo77

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hey thought i might chip in i too got gtx 660 twin frozr III running SLI
did you try to use the MSI Afterburner freeware it works pretty well with 660 can also open the core voltage in settings if needed
i do agree that that is an insanely high mhz ratio your running for that card i upped mine with
+140mhz core clock and +400mhz memory clock if you leave the voltage disabled there is a power limit % option that is pretty failsafe
that is running on 110 (10%) boost it runs very smooth ofc it might be different with your system and i am running sli, good thing about this program is that it also synchronize with any other card you might have installed or wish to install later
not that i wanted to do any commercials for any programs :D just seemed a tad bit over the top with 990clock to push 1200+ mate
that might kill your card sooner then you wish i would rather upgrade or buy a second one if i had to push into the extremes to see improvements
well good luck hope you get your desired mhz fps :)
 
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008Rohit

008Rohit

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I modded the BIOS again and changed the max voltage from 1.212V down to 1.187V (stock is 1.175V). Now, at this voltage the card can easily push over 1120MHz and also runs stable. So, I'm just keeping it like that for the time being. In any case I can increase the clock a bit more without modding the BIOS now and 1.187V is also safely within the max limit. So, I've settled with 1123MHz for now. :)
 
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008Rohit

008Rohit

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Yeah, I've been doing that since the beginning. It's not going much further if I just increase max TDP instead of voltage. I had to increase a little bit of both for 1123MHz. BF4 is a bit slower now but it's still playable at 40FPS. :)
 
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