Graphics Card Overclocking
Thanks to motherboard and VGA manufactures, overclocking has become such an effortless task, giving literally anyone the chance to overclock their components with very little risk.
When it comes to overclocking graphics card we use and recommend two program - for ATI cards you can't go past ATI Tool and if you're on the other side of the fence and using an nVidia card the Coolbits 2 registry hack is it. Both programs offer an Auto Overclock feature which is what we use.
The standard clock on the ASUS 7800GT TOP is 420MHz core and 620MHz on the memory. We managed to achieve a surprising 458MHz on the core and 660MHz on the memory without the use of any fans. With some good yet quiet airflow in your case we would not be surprised if you could get a little bit more.
When it came to VGA overclocking, the performance jump on both the single 7800GT and dual 7800GT were very visible.
Doom 3 sees a small increase when it came to overclocking the graphics card with nothing to get excited about.
Performance on both setups seemed to take a slight dive when it came to overclocking the graphics cards.