A federal judge is giving Rambus Inc. 30 days to agree to drastically reduce its $306.9 million jury verdict against rival chip manufacturer Hynix Semiconductor Inc. or take its chances at a new damages trial.

In an order issued Friday, U.S. District Judge Ronald Whyte ruled that the damages awarded to Rambus in April were not supported by the evidence presented during the month-long patent infringement trial. Whyte concluded that the testimony given by Rambus’ key financial expert in the case only supports a verdict of $133.6 million.