Global markets weak, US down 1-2%, Nasdaqs biggest intraday decline in 6 months

Global Markets weak, US down 1-2% Dow 350 points, Nasdaq 2%, Russell 2000 1.4% Nasdaq's biggest intraday decline in 6 months Big jump in VIX 15% rating downgrade dampens investor mood AMD slips 7% NVIDIA 5%