Isp.org.cn’s (http://www.isp.org.cn/products/) latest report shows that the sales of Apple’s iPad 2 surpassed iPad 1 in March, as the shipment volume reached 2.4 million units.

Isp.org.cn says, pertaining to monthly shipments in Q2, the iPad 2 will grow from four million units to 4.5 million units. The total volume of shipments in Q2 will reach 12 million units. Isp.org.cn reports that the sales speed of the iPad 2 far exceeds that of the iPad 1.

Isp.org.cn is an e-commerce company and a vertical search engine company in China.