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How Do I properly oc my 450gts.

post #1 of 9
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I have a pair of 450 gts's. I have evga precision and I'm kinda like does this even work half the time.

The attempts I have made to oc have all been through EP and I tell ya, It just seems to make the cards unstable with even the lightest tweeking. I don't know if I need to go into the bios and change voltages on the pci stuff or what. A little help would be greatly appreciated, Thanks in advance!
    
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post #2 of 9
Can you give us a screenie of the stock voltages, temperatures, and clocks? Also, try MSI afterburner.
    
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post #3 of 9
Download MSI Afterburner and enjoy. You can adjust volts frequencies fan speeds, etc.

Let us know if you need any help once you get it running

Edit: Damn, sniped by Krogoth!
post #4 of 9
+1 fr afterburner, it got my 460 to 1GHZ
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post #5 of 9
Use MSI Afterburner, enable all the voltage options, enable fan control and setup a custom fan profile to ensure that your temperatures stay low.

Get OCCT, set up a 15 minute GPU test and enable error checking. Run the card at stock values first to determine stability - if it errors at stock you should RMA it since its faulty. If it passes, its time to move on.

Start raising your Core clock by 10MHz and hit apply, and make sure you have the sharers linked to the core clock. For every 10MHz bump, test for 15 minutes. If you get ANY errors, hit escape to leave the test, bump up the voltage 10mV, apply (it will adjust it slightly, don't worry), and test again... Repeat the voltage bumps until it has no errors in the test. If its stable in the test with no errors, push up the clock another 10MHz, apply, rinse and repeat.

When you find the max core and shader clock, bump up your memory clock a hundred MHz and test it with the GPU memory test in the same fashion. This time when it becomes unstable and errors, back it down to the last stable clock and leave it. The memory doesn't need to be overclocked that hard.

If its stable under those conditions, you are finished!
Edited by Talon95 - 5/20/11 at 2:53pm
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post #6 of 9
Quote:
Originally Posted by Talon95 View Post
Use MSI Afterburner, enable all the voltage options, enable fan control and setup a custom fan profile to ensure that your temperatures stay low.

Get OCCT, set up a 15 minute GPU test and enable error checking. Run the card at stock values first to determine stability - if it errors at stock you should RMA it since its faulty. If it passes, its time to move on.

Start raising your Core clock by 10MHz and hit apply, and make sure you have the sharers linked to the core clock. For every 10MHz bump, test for 15 minutes. If you get ANY errors, hit escape to leave the test, bump up the voltage 10mV, apply (it will adjust it slightly, don't worry), and test again... Repeat the voltage bumps until it has no errors in the test. If its stable in the test with no errors, push up the clock another 10MHz, apply, rinse and repeat.

When you find the max core and shader clock, bump up your memory clock a hundred MHz and test it with the GPU memory year in the same fashion. Instead this time when it becomes unstable and errors, back it down to the last stable clock and leave it. The memory doesn't need to be overclocked that hard.

Now.. The ultimate test is to finalize everything. Run the GPU test for one hour and the GPU memory test. If it errors at all, an additional voltage bump will be required and test again.

If its stable under those conditions, you are finished!
One hour? Its not a CPU. 20 Minutes at most is fine with something like OCCT.
    
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post #7 of 9
Hmm... I always run it for one hour to know 100% it's stable. I like to know that it will never crash or artifact due to my overclock.

15 minutes is probably enough to know but if you're like me you need to be extra sure, like those people that run Prime95 for 24 hours.
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post #8 of 9
Quote:
Originally Posted by Talon95 View Post
Hmm... I always run it for one hour to know 100% it's stable. I like to know that it will never crash or artifact due to my overclock.

15 minutes is probably enough to know but if you're like me you need to be extra sure, like those people that run Prime95 for 24 hours.
P95 is a different beast on a different kind of processing power. Just saying, one hour is overkill, 20 minutes is totally safe.
    
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post #9 of 9
Alright, thanks for the advice, repped ya and fixed my post.
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