Nvidia is up against stiff competition in China. NurPhoto / GettyUS government restrictions have made it tough for Nvidia to grow its business in China.Nvidia has cut prices for its H20 chip in China amid competition from local chipmakers.Some say demand for Nvidia's H20 is low due to its cost-to-performance ratio and local alternatives.Nvidia is facing steep competition from chipmakers in China.The US chipmaker was forced to slash the price for the H20, its most advanced chip designed for the Chinese market, amid abundant supply, Reuters reported.