An Nvidia logo and a computer motherboard appear in this illustration taken August 25, 2025. REUTERS/Dado Ruvic/Illustration/File Photo Purchase Licensing Rights, opens new tabSummaryCompaniesDeepSeek's AI models rival US offerings with less computing powerLetter says Nvidia provided technical assistance to DeepSeek, boosting training efficiencyUS concerns over Nvidia chips aiding China's military despite restrictionsSAN FRANCISCO, Jan 28 (Reuters) - U.S. chipmaker Nvidia (NVDA.O), opens new tab...