** Shares of chipmaker Intel INTC.O up 4.1% premarket to $20.56 after announcing Altera stake sale to PE firm Silver Lake
** INTC says to sell 51% stake, valuing programmable chip unit at $8.75 bln
** Co bought Altera for nearly $17 bln in 2015, and has taken steps since last year to spin it out
** In Feb, Silver Lake was reported to be in exclusive talks to purchase a majority stake in Altera in about $9 bln deal
** Through Fri close, INTC shares have lost roughly half their value over the past one year
** Meanwhile, shares of rivals Nvidia NVDA.O and Advanced Micro Devices AMD.O rising premarket after the Trump administration granted exclusions from steep tariffs on imported semiconductor chips
(Lance Tupper is a Reuters market analyst. The views expressed are his own)
((lance.tupper@tr.com 1-646-279-6380))
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