Tepper, the billionaire owner of Appaloosa Management, said last week at the Robin Hood Investor's Conference that the Chinese yuan is massively overvalued and needs to fall further. His comments follow similar forecasts from some of the biggest hedge fund managers, including Crispin Odey, founder of the $12 billion Odey Asset Management, who predicts China will devalue the yuan by at least 30 percent.

The money managers are losing faith in China's ability to revive its economy, which suffers from rising nonperforming loans and falling exports, after the surprise 1.9 percent currency devaluation in August and global market rout that followed. The investors made their dire forecasts after shares of U.S.-traded Chinese companies, which their funds sold in the third quarter, began to rebound in October.

"The downside scenario for China seems more intimidating than ever before," billionaire Dan Loeb wrote on Oct. 30 to investors at Third Point, which manages $18 billion. "The new question is not whether but how severe the slowdown of the world's foremost growth machine will be."