On the same day as ATI, Nvidia has issued their own Geforce 178.24 WHQL certified driver. The new version brings support for newly released Geforce 9-series motherboard GPUs and several application compatibility fixes.

The new WHQL driver supports Geforce 6, 7, 8, 9, and 200-series GPUs and adds support for Geforce 9800GTX+, 9800GT, 9500GT and 9400GT GPUs. According to what we could see, the performance improvements are basically the same as with the previous driver version, as it is compared to 175.19 WHQL in the release notes.

Other than the new Geforce 9 series motherboard GPU support you shouldn't see any other improvements or fixes when compared to the previous 178.13 WHQL drivers.

You can find new driver version here.