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Old October 20, 2011, 05:08 PM
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Default Overclocking GTX 460 for more ppd

Got both my GTX 460's running @ 855 core which get's me close to 12K PPD... If I try to go any higher I get unstable machine errors... I'd like to squeeze a little more out of them if possible. Would raising the voltage on the cards get me a higher stable overclock for folding? I've never actually tried this on a videocard and was wondering if anyone could recommend a guide or tutorial on how to go about this... and what would be a safe voltage range to use. Also does overclocking the memory help get more PPD.
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Old October 20, 2011, 05:15 PM
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Been quite some time since I've folded using GPUs, but I taught that you only had to overclock the shaders for best ppd increase?
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Old October 20, 2011, 05:18 PM
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Core and shaders are locked together with fermi.
And yes you can bump up the voltage to get a higher clock, try very small increments and watch the temps, make sure its furmark stable before running FAH. You should be able to hit 900mhz on the core.
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Old October 20, 2011, 05:52 PM
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What application should I use to raise the voltage? Currently using EVGA precision... Don't see any voltage settings.
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Old October 20, 2011, 06:07 PM
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MSI Afterburner is a good one.
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Old October 20, 2011, 06:09 PM
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Quote:
Originally Posted by supaflyx3 View Post
Core and shaders are locked together with fermi.
Eh. I live in the past in regards to GPU folding... we actually had this discussion over the week-end at the Toronto meet, between ChrisK and I.
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Old October 20, 2011, 06:46 PM
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Hey boggtrotter check out my tutorial on unlocking the voltage cap for the 400 series cards LINK -----<

i use msi afterburner and currently at
Voltage: 1087
Core: 900
Shader: 2200

61C after folding all day

about 13k PPD sometimes 16k PPD on good WU


and btw ur i7 920 is pulling in a good 18~ thanks again :P
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Old October 20, 2011, 06:51 PM
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Quote:
Originally Posted by 3.0charlie View Post
Eh. I live in the past in regards to GPU folding... we actually had this discussion over the week-end at the Toronto meet, between ChrisK and I.
Yep. hard to keep up with all the small technicalities of the various clients and setups when bigadv/bigbeta works so well. Set it and forget it.

As for your question, its like Ocing a cpu. Some extra voltage but don't add to much. MSI Afterburner is a good suggestion for all your GPU overclocking needs. Here is a handy thread: GTX 460 Default Voltage and Max Safe Voltage - Overclock.net - Overclocking.net

Don't rely much on Furmark for stability testing... folding is the only way to really tell.

Also, memory overclocking is not worth it. I have heard of situations where it was said to possibly on occasion make a difference, but really with the fermi card you are OCing the core (which will also over clock the shaders).

Overclock 50mhz at a time, do a WU or two, try another 50mhz.etc until unstable. Then add a little bit of volts using the thread linked (or google default voltages on factory Oced cards) until you get acceptable temps.
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Old October 20, 2011, 06:57 PM
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oh and usually the 756MB versions overclock a lot better than their 1GB counterparts

also HIGHLY recommend to pull the the heatsink off and apply some quality paste makes a HUGE difference ...in my case 15-20 C
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Old October 20, 2011, 07:26 PM
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O.K. guys, Thanks for the tips and suggestions That will be my project for the weekend. Probably worth doing as going from 800 mhz to 855 mhz netted an increase of around 500K PPD.


Quote:
Originally Posted by MikeFallen View Post


and btw ur i7 920 is pulling in a good 18~ thanks again :P
No problem... You should try running -bigadv on that chip if it's practical... I think I was getting around 33K PPD @ 4 Ghz and as much as 31K running 3 GTX 260's...IIRC. Kinda regret selling it now... that was an awesome machine... hope it has served you well. If you ever decide to upgrade and sell it, drop me a pm.
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