Download MSI After burner utility. Install and run the app. You will see memory clock in mhz & core clock in mhz. Increment core clock by 5 and memory clock by 10. Check the system stability after each increment. When the system starts freezing, then that is the threshold point. Decrement both core and memory clock by a factor of 10 from that point to achieve stability.
Check the temperature levels as you overclock and keep it below 60c - 65 c in idle imo.
To know the results in games, download and install fraps to check the increase in fps as you overclock.
So i used the MSI Afterburner utility to overclock . Kept increasing the Core Clock and Memory Clock and used Furmark as the Stress Tester as recommended on this page:
How to overclock the GTS 450 | PC Format
This is what i've settled on currently :
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I used Grand Theft Auto 4 as the medium for checking the change in performance . Now it runs on high detail on 1024x768 without any lag !! Well the low res is because im still on a paltry 15" CRT . The game used to lag heavily on high settings before the OC