The CAFC has already ruled that RAMBUS did it disclosure duty under JEDEC rules. It has also ruled as Judge Payne did that there were no US patent applications which read on the proposed SDRAM standard. In fact there were none until around 1997. Moreover the CAFC said that RAMBUS had a right to mine its master US patent application.
The FTC can invoke antitrust over patents if and only if Rambus obtained the patents by fraud or if they filed a "frivolous" infringement suit. The CAFC in remanding the case back to the lower court has ruled on both issues.
The original lawsuit that Rambus brought against IFX was deemed "frivolous" by Judge Payne only after he prepared a Markman which the CAFC has ruled is clearly wrong.
The FTC has no legs to stand on and if they persist in their pursuit of this small company they will be look like they have sold themselves to Mu. The link between Mu and the DFTC is well documented and it is also apparently a family affair.