NVIDIA has quietly bolstered the rear guard of its GPU line with the addition of the GeForce 9400 GT. Sharing the same optimizations as the rest of the 9 series, the chipset has just 16 visual effects cores but is fast enough to double the performance of its GeForce 8400 equivalent from just a year ago, according to the graphics card maker's estimates. A 550MHz main clock speed and 800MHz effect
