Here's AMD's statement:
On October 10, 2008, the U.S. Department of Justice informed AMD [NYSE: AMD] and ATI Technologies that it has closed its investigation into ATI Technologies’ pricing and marketing practices in the sale of graphics processing units (“GPUs”). On December 1, 2006, AMD announced that ATI had received a subpoena from the U.S. Department of Justice.And here's the one from NVIDIA:
NVIDIA Corporation (Nasdaq: NVDA) today announced that the San Francisco Office of the Antitrust Division of the U.S. Department of Justice (DOJ) has formally notified NVIDIA that the DOJ investigation into potential antitrust violations related to graphics processing units and cards has been closed. No specific allegations were made against the Company during the investigation.
On December 1, 2006, NVIDIA disclosed that it had received a subpoena from the San Francisco Office of the Antitrust Division of the U.S. Department of Justice in connection with the DOJ's investigation into possible antitrust violations related to graphics processing units and cards.