Advanced Micro Devices (AMD 4.81%) stock closed out Wednesday's daily session with big gains. The semiconductor company's share price rose 4.9% in a day of trading that saw the S&P 500 index climb 1.6% and the Nasdaq Composite rise 2.5%. The stock had been up as much as 8.7% earlier in the day's trading. On the heels of recent sell-offs, AMD is now trading at roughly 20 times the average analyst target for this year's earnings -- although it's likely that earnings estimates will continue to come down as tra ...