Help with overclocking 560

[Rich_]

Have encountered some issues while incrementally increasing my clock speeds on an EVGA GTX 560 Superclocked (not ti). The FPS would just drop to ~15 at a certain point.

What does the massive fps drop mean?
I have not experienced artifacting, my temperatures have not gone above 86c at their hottest points.

Furmark GPU Stress Test OpenGL Benchmark


Burn In Test.
- Settings -
1024x576
anti-aliasing off
Windowed mode.

Burn in testing. MSI Afterburner used for clock speeds.
stock 850mhz core clock - 5 minute mark - 83c temp - avg fps 58.
Profile 1 875 mhz core clock - 5 minute mark - [84]c temp - avg fps [58].
Profile 2 900 mhz core clock - 5 minute mark - [84-85]c temp - avg fps [60].
Profile 3 925 mhz core clock - 5 minute mark - [85-86]c temp - avg fps [63].
profile 4 950 mhz core clock - 5 minute mark - [ ]c temp - avg fps [ ]. problem encountered- 15 fps.

Restart pc, everything default clock including cpu.

furmark 720p preset benchmark.
http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106567 stock gpu clock.
http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106568 bump to 950 where i encountered problem in the Burn In Test. benchmarked fine.
http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106569 bump to 970. Encountered same problem as the 950mhz burn in test, FPS plummeted to about 15 at the 30 second mark.


edit- is voltage not high enough?

 

[CJDanielson]

I do not have massive amounts of experience with over clocking but I do have a little. I noticed that you jumped from 875 to 950 did you make any volt adjustments? If you got stability at 925mhz I would try and go up in 5-10 mhz jumps from there instead of 25mhz. Personally when overclocking I tend to stop around the 70-75C mark that's just me though. I know some people who go higher temp wise. That would be a question for one of the more experienced members here though.

 

[Rich_]

Have not increased voltage.

Stock clock is 850mhz

Did burnin tests in 25mhz increments. 950mhz on burn in test saw massive FPS drop at ~30 second mark.

Did the benchmark, which is different than the burn in test, and had no trouble at 950mhz. then @ 975mhz i had the same problem.

Just got done doing a burnin test at 940mhz, it's stable and hovers around 85-86c temperature after 5 mins..

Also did a benchmark @ 940mhz, it had only 84c. - http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106577

Here is the non-overclocked benchmark @ 850mhz - http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106578

Never OC'ed before. Trying to figure out the cause of the FPS drops, and whether or not i found the limit of this GPU.

 

[CJDanielson]

I know there is a silicone lottery with GPUs. Sometimes you get one that overclocks like mad and other times you get one that does not over clock well at all. You have achieved stability at 940mhz and have not increased volts. I would suspect that in order to get more out of the card you will have to increase volts. If you wish to try for higher clocks I would suggest bumping your volts up slightly along with the mhz to see if that stabilizes it out. I would also advise against going to much higher until someone with more experience than me can tell you acceptable heat high end range for your chip. (I am one who plays things safe)

 

[Rich_]

stable at 945mhz core clock also bumped the memory clock to 2100mhz from 2052mhz

http://www.ozone3d.net/benchmarks/furmark_192_score.php?id=106582

I guess this might be the limit i dunno. i unlocked the voltage in msi afterburner and did a very very tiny increase, then clicked apply and it went right back to default voltage.

 

[CJDanielson]

Humm. I am not sure what to tell you at this point. Its still a good jump to go from 850 to 945. Hopefully someone with more experience than me can give you some advise on what to do from here to get more out of your card.

 

[CJDanielson]

As far as the suddenly becoming unstable as far as I can tell it would be due to the lack of volts.

 

[FTLN]

you need a unlocked bios to go higher with the voltage, I managed to do it on a msi card maybe it can work for you.. Check the review i did over here, you can find the unlocked bios halfway down the page - http://forum.overclock3d.net/showthread.php?t=41332

Make sure you look up blind flashing if anything goes wrong...

 

[Rich_]

Thanks - got evga precision tool, it lets me mess with voltage and maxes available volt to 1088

Alright.

Stock - 850mhz 1025v.

As high as i feel comfortable atm. 965mhz 1055v. Could go higher but 1088v temps climb real fast.

Anybody with a 560ti (mine is not a ti) got stock results from the same benchmark? It feels a lot snappier, gonna test this in games for the next couple hours and see if i got stability. Would like to see how this result compares to a stock clock 560ti with the extra 48 cuda cores.

 

[FTLN]

Your 560 is gonna be much faster than a stock 560ti at those speeds, give 3dmark11 a run in performance and share your results..

 

[Master&Puppet]

Yea what you experienced there is the limit of the clock you can get at stock volts. When you are just under the amount to make it stable the GPU won't work at full load because there aren't enough volts to support it. If you had a hardware monitor you would see that rather than the card working at 950MHz and 100% load both figures will probably be jumping around a lot and that will explain the drop in FPS.

So you either need to add a touch more to the voltage or back off the clock which you've obviously done.

 

[Rich_]

Here's the 3dmark 11 score - How's it comparing to those 560 ti's?

Link- http://www.3dmark.com/3dm11/5653201

Pic -

 

[Recon-UK]

Removed my comment, i forgot about Furmark's stupidity...

 

[Josh Weston]

Nooo, not Furmark! Furmark's been known to completely trash cards. Use something like Unigine: Heaven to get your card hot.

 

[Recon-UK]

Nooo, not Furmark! Furmark's been known to completely trash cards. Use something like Unigine: Heaven to get your card hot.

If i could +1 you, i would.

I really should not advise furmark, slap myself...

@OP

I know this is a different GPU to yours, but the methodology is the same.
http://forum.overclock3d.net/showthread.php?t=45446


Use 3DMark 11 and Heaven, they get the most from your GPU and CPU.

Heaven will tax your GPU only, and is a great GPU stability test, 3DMark 11 will throw your whole system under load, and will test if your power supply can keep up.

 

[FTLN]

Thats a good graphics score, 560ti's come in around the 4700 mark at stock according to reviews..

 

[Rich_]

do not worry, the card conquered furmark, and thanks for the heads up i'll refrain from using it now

 

[jamesriley94]

Your RAM only seems to be running at 1333mhz.
You need to manually put it up in the BIOS.

 

[Rich_]

Your RAM only seems to be running at 1333mhz.
You need to manually put it up in the BIOS.

oh thanks