Just because AMD had a quarter of good earning, doesn't mean they'll hold onto that growth for long. This was a traders price move. If latest PR isn't in suit for 4th quarter, expect the price to relax back to previous trend line.
This may even be worth looking at as a same sector hedge against the bullish NVIDIA Idea I was looking at today.
I wouldn't be shorting, but I wouldn't be holding or buying as a trader