Even though there are no fundamental architecture improvements, the Inno3D GTX 275 OC does not disappoint. On average it outperforms the more expensive GeForce GTX 285. If that is still not enough performance for you, you could do some additional overclocking for even more performance. Hardcore overclockers might be a bit disappointed by the use of a non-Volterra voltage regulator which means that there is no software control for the GPU voltage.
The only drawback of this card is that the fan is ramping up to be quite noisy under load. Unfortunately it seems that there is no way around this with the stock cooler since even at this high fan speed the card is running at around 90°C - no room left for optimizations here. Since Inno3D has been working with Arctic Cooling in the past (we reviewed their iChill GTX 260 here) I have high hopes that we will see an iChill GTX 275 soon.