Infineon Execs Pleading Guilty in U.S. DRAM Probe  SAN FRANCISCO (Reuters) - Four sales executives of German  chip maker Infineon Technologies AG &lt;A HREF="http://www.reuters.co.uk/financeQuoteLookup.jhtml?ticker=IFXGn.DE qtype=sym infotype=info qcat=news"&gt;IFXGn.DE&lt;/A&gt; have agreed to  plead guilty to participating in a conspiracy to fix the prices  of computer memory chips, the U.S. Department of Justice said  on Thursday.