Asia-Pacific markets mostly slump as investors assess Nvidia results, South Korea and Taiwan lead losses

Asia-Pacific markets mostly fell on Thursday, with tech stocks dragging South Korean and Taiwanese indexes after chipmaker Nvidia reported its second-quarter results.

Nvidia's earnings for the quarter ended July beat Wall Street expectations, with the company providing stronger-than-expected forecast for the current quarter. The company also authorized an additional share buyback of $50 billion.

Revenue for the second quarter came in at $30 billion, up 15% from the previous quarter and 122% higher from a year ago. However, the firm's shares fell 8% in extended trading.

South Korean chip heavyweight SK Hynix plunged 5.35%, while Samsung Electronics fell more than 3%, dragging the Kospi down 1.02%, leading losses in Asia and closing at 2,662.28.

The small-cap Kosdaq was down 0.85% at 756.04, its seventh straight day of losses.

The Taiwan Weighted Index lost 0.75% to 22,201.85. Taiwan Semiconductor Manufacturing Company shares shed 2.18%, while Hon Hai Precision Industry — known internationally as Foxconn — dropped 2.4%.

Japan's Nikkei 225 fell marginally to end at 38,362.53 while the broad based Topix managed to eke out a 0.03% gain to 2,693.02, after spending most of the day in negative territory.

Australia's S&P/ASX 200 was down 0.33, closing at 8,045.1.

Hong Kong's Hang Seng index reversed losses to gain 0.47% as of its final hour, while mainland China's CSI 300 lost 0.27%, extending its losing streak to four days and hitting its lowest level in almost seven months.

Overnight in the U.S., all three major indexes fell in the regular trading session and before Nvidia's results, with the Nasdaq Composite down 1.12%, while the S&P 500 slipped 0.6%.

The Dow Jones Industrial Average lost 159.08 points, or 0.39%.

—CNBC's Lisa Kailai Han, Hakyung Kim and Kif Leswing contributed to this report.