NVIDIA Corp. [NVDA] has a Beta of 1.45 (according to google finance) and a standard deviation of monthly returns of 9.6% since 2011. Bed Bath and Beyond [BBBY] has a Beta of 0.67 (according to google finance) and a standard deviation of month returns of 11.3% since 2011. If i am a widely diversified investor, which stocks add more risk to my portfolio?