NVIDIA's long time partner TSMC (Taiwan Semiconductor Manufacturing Company) was facing a problem of low yields on 40nm processes. Naturally it became a stumbling stone for NVIDIA also. Now TSMC reports yield point improvements, so there is a little doubt that end users will not benefit from new GeForce GT210 (GT218) and GeForce G220 (GT216) before middle autumn.
The benefits of the 40nm fabrication process are mostly concealed in GPU's dimensions – they are smaller. In perspective it means more powerful graphics units for both notebooks and desktops.