GTX 480

[JezEngland]

Hi,

recently I've corrected temperature and fan problems with the GTX 480. I get around 20-30 degrees cooler than standard using the same cooler and with lower fan speed. A link to the thread about that project is at the bottom of this post.

The EVGA card is factory overclocked at 726Mhz with 1.013Volts. The Point of View card is stock @ 700 Mhz and it's voltage is higher at 1.050 Volts.

I think experimenting overclocking should be done like with other components, doing a little raising extra voltage then frequency setting at a time.

OC'ing CPU has made my PC crash. What'll happen when the GPU is not stable? I need advice so to avoid problem like crashing etc.

I want advice on what voltage to use for a 750Mhz and 775Mhz and 800Mhz and other frequency's. Suggestions please

Thanks

Here is like a max overclock for the GTX 480: http: http://www.guru3d.com/article/overclocking-geforce-gtx-480-with-extra-gpu-voltage/

Here is a link to my cooler and quieter with reference cooler project thread: http://forum.overclock3d.net/index.php?/topic/32974-cooler-quieter-with-reference-cooler/

sorry wrong section

 

[tinytomlogan]

Each GPU is different just like CPU's.

Basically when you clock you test for stability thats kinda the point. if its not stable add more volts. Easy

Just remember volts = heat so watch the temps like a hawk.

 

[JezEngland]

Thanks.

Generally what'll happen if the GPU core isn't stable?

 

[tinytomlogan]

Games will freeze, graphics drivers will crash. Best thing to do is play. Youll soon work it out its really easy matey.

 

[JezEngland]

We thanks alot

 

[JezEngland]

In Afterburner and NVIDIA Inspector Voltage max is 1138mV. Can it go higher? Is there software for that? Does the card need a different BIOS?

Thanks

 

[thestepster]

you will need a bios that allows more, but remember u can brick the card and flashing a new bios on it voids all warranty

 

[JezEngland]

Thanks. OK I'll email EVGA for their BIOS and warranty info. It does cover overclocking and volting

 

[JezEngland]

EVGA replied. No new BIOS's and no plans for a new one.

I've got this stuff running 840mhz on the 1st card (POV) and 850mhz on the 2nd (EVGA SC+) in CRYSIS. If I put both to 850mhz it crashes, freezes and often I can exit to desktop or it's locked and i force power off.

When it crashes AFTERBURNER resets.

I ran OCCT quickly and no crashed at 840mhz on each and crash at 850 each and 860 each.

I've tried different PCIE frequencys in CRYSIS.

I may have met the POV 480's limit.

In OCCT test the PCIE frequency was at 106mhz and in CRYSIS it was 120mhz

Voltage is at max

What could be done to improve stability?

Thanks

 

[ciksas]

water, LN2

 

[JezEngland]

I'll try it at 100mhz PCIE frequency

 

[ciksas]

If you look on hwbotthere really aren’t much better overclocks on air.

 

[JezEngland]

Running OCCT 850mhz on both it artifacted at 4ish minutes, I stopped it and looked at the results. Why is the Vcore fluctuating at the end of this and is that causing the problem?

I've shut down my mobile phone before doing this test

Thanks

 

[JezEngland]

Thanks for the results link. With OCing does the threshold temp limit lower?

RESULT: 5 mins OCCT, PCIE @ 100mhz, 850mhz each it's good. Temps 89,90. Fan speed 70%. V Sync enabled. 4xSupersampling. High Quality Texture Filtering etc in 3D Settings.

I lowered the Memory to 3700mhz and no Artifacts. In game I've had it at 4200mhz and 10ish artifacts over 1 hour

 

[JezEngland]

If you look on hwbotthere really aren’t much better overclocks on air.

How do they get the voltage higher than my BIOS allows it?

 

[JezEngland]

Problem was CPU OC looks like. I've set it to BCLK 191 RATIO 21 = 4Ghz with 850mhz on each core in Crysis Warhead, no crash

EDIT: Ive configured CPU settings and it was bottlenecking the 480's. Now Crysis runs better with 800mhz on the 480's and 4.1Ghz CPU

How do they get the FERMI GF100 voltage higher than the BIOS allows? I heard TinyTom mention a secret software. Do you know what that is?

 

[JezEngland]

I've found a BIOS editor though I wont use it. My cards freeze at 850-860 mhz in Furmark and Crysis. Maby the cards power draw is maxed. The 1000watt PSU should have more to give. Pro overclockers had the 480 at 900-1000mhz maby more. Any ideas to get a stable higher OC please?

I'm gona look for custom cards with extra power sockets for future builds

 

[JezEngland]

I found info on the website you linked ciksas and some OC's are 1200-1300mhz core clock

http://hwbot.org/forum/showthread.php?t=7626

 

[JezEngland]

Games will freeze, graphics drivers will crash. Best thing to do is play. Youll soon work it out its really easy matey.

I got it sus'd generaly

. Thanks Tom