That's now how it works. You don't buy AFTER good news... the news is already factored into the price.
I don't think it is in this case because it isn't reported news. It's just hearsay from a website devoted to covering 3D graphics. The stock has been relatively stable over the past weeks and months, if not slowly inching upward. There has been nothing that shows the market is aware of any news, good or bad. Nvidia reports earnings Wednesday. I'll betcha there will be a nice spike post-earnings. But then again, if Nvidia forecasts Tegra revenue to continue to be crappy, then that may wipe out the good feelings of beating earnings.
I missed my chance with Nvidia. Had bought last year at under $13, but grew impatient and worried after seeing Tegra 4 nearly DOA and sold for very little profit.