How should you overclock your card? and what is safe overclock with your card?
Do not make mistake and directly overclock your card by 50 MHZ. This is common mistake made by many people. Also many people ask what is safe overclock range for my card? There is no particular answer to this question. Every card is different and has different overclocking potential. Follow the following procedure to get the best overclock with your card with what cooling you have for now.
1. Increase your core and memory speeds by 5 Mhz each atmost at a time.
2. After you overclock run a benchmarking software like 3dmark2001 or 3dmark2003 or software like "rthdribl"( this is my personal choice as this really pushes the card to max but will only run on Dx9 cards) or some graphic intensive game for 5 minutes.
3. If you dont see any screen corruptions, small black triangles, white or black dots and artifacts then it means this speed is ok for you.
4. Again increase your clock and memory speeds by 5 MHz and again run the benchmark or game.
5. Keep doing this until you get system crash or lockdown or artifacts/white-black dots, screen corruption. This is the absolute limit og your card.
6. When you see these symptoms reduce your clock and memory speed by 10 Mhz.
7. Now try just overclocking RAM and not the core again in steps of 5Mhz until you get artifacts or above symptoms.
8. when you get artifacts again reduce the memory speed by 10Mhz and this is your final safest settings.
9. Always run your card atleast 10Mhz slower than the speeds at which you get artifacts.
10. If ram doesn't overclock more the you may try same thing with core only keeping RAM speed constant.
Is extra cooling needed if I overclock?
Its not necessary but recommended. Have a good airflow in your case. A fan blowing air directly on card always helps.
Originally Posted by Mazhar
Now to some serious overclocking and cooling
If you have some experience of overclocking and feel confident enough to move one here comes some serious overclocking.
Before I move on to this there is small thing you can do. If your bios support it try increasing AGP voltage ( AGP VDDQ ) This helps to get little bit more overclock out of the card.
If you do feel like you have reached limits of your card and still want to overclock more the watercooling is a way to go. Watercooling increase the possibility of overclock by almost 30% more overclock than air cooling.
Also remember that watercooling also runs card a lot cooler resulting in increase life of your hardware.
You can use watercooling just for your videocard. You will need a good waterblock. And the best one are Maze4GPU waterblock by dangerden which can be found at www.dangerden.com. The other good one is Swiftech.
There are also voltmods you can do but requires knowledge in electronics and some soldering experience.
ATI/Nvidia Users can see how their card are being modified from here.