The Asus ENGT430 overclocks fairly well. We were able to take the card from a 700/1400/800 MHz core/shader/memory clock to 850/1700/900 MHz settings.
The performance increase gets us a lot closer to the Radeon HD 5570 and GeForce GT 240 in Crysis. This does give us hope that a GDDR5-equipped GeForce GT 430 with slightly higher core and shader clocks could, in fact, replace the GeForce GT 240. The Radeon HD 5670 remains untouchable here.