AMD's market share gains could come under pressure.On Thursday, Intel (INTC -3.22%) and Nvidia (NVDA 0.34%) announced a shocking deal that will pair the two companies' technologies in PC and data center central processing units (CPUs). This news looks problematic for Advanced Micro Devices (AMD -0.23%). AMD has made an extraordinary comeback over the past decade in both markets, with a unit market share across PCs and servers of around 24% in the second quarter, up from 11% in 2016. Those gains could come u ...