Matthew over at AnandTech has posted his review of nVidia's latest mobile GPU, the speedy GeForce4 4200 Go which is designed to compete directly with ATI's Mobility 9000. Judging by the benchmarks, it does a good job of it as well.

There is no question that the GeForce4 4200 Go holds the performance crown in the mobile world today, however it only holds this crown on paper. If NVIDIA is able to bring the product to market by the end of this year, they will find themselves in a very comfortable situation; the chip will be the undoubtedly the mobile GPU of choice. However, if OEMs are slow to adopt the GeForce4 4200 Go or if NVIDIA is not able to bring the chip to market on time, they will be faced with some competition. ATI is not ready to roll over and let NVIDIA steal the performance crown from them one more time. There are certainly forthcoming mobile ATI products on the horizon that set to not only perform on par with the GeForce4 4200 Go but offer better power management and thermal characteristics. From what we have seen today, it will be difficult to match or beat the GeForce4 4200 Go performance-wise any time in the near future but ATI remains optimistic.