Intel set for best day in nearly four decades after Nvidia investment

** Shares of chipmaker Intel INTC.O soar 24% to $30.88, headed for their highest pct gain since Oct 1987 at current levels, after Nvidia NVDA.O to invest $5 billion

** The partnership includes a plan for Intel and Nvidia to jointly develop PC and data center chips

** NVDA will pay $23.28 per share for Intel common stock, a price slightly below the $24.90 at which INTC shares last closed on Wednesday

** Shares of NVDA up 2.7% at 174.93

** Including session move, INTC up 56.7% YTD while NVDA up 29.9%