** Nvidia NVDA.O and Advanced Micro Devices' AMD.O shares fall
** Brokerage UBS cuts PTs on chipmakers' shares due to tighter U.S. controls on exports of advanced AI chips to China
** NVDA down 3.4% to $100.99, AMD falls 0.7% to $87.75
** Brokerage cuts Nvidia's PT to $180 from $185, AMD's PT cut to $155 from $175
** $5.5 billion in charges flagged by NVDA due to U.S. export restrictions imply a revenue impact of ~$9 billion, with $700 million of this coming in Q1 and remaining ~$8 billion spread across Q2 and Q3 - UBS
** AMD's revenue impact seen as ~$1 billion based on $800 million in charges - UBS
** Brokerage sees softer overall demand environment for AMD in the back half of the year given tariff headwinds
** YTD, Nvidia shares down 24.8%, AMD down 27.4%
(Reporting by Arsheeya Bajwa)
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