SUN FIRE X4600 M2 Certifications Product Versions Level Red Hat Enterprise Linux (x86_64) 5.x Certified [1] Red Hat Enterprise Linux 4.4 - 4.x Certified [2] Additional Notes Which Update release of Red Hat Enterprise Linux 5 is required for a Sun Fire X4600 M2 system equipped with AMD Opteron processors codenamed "Barcelona"?Which Update release of Red Hat Enterprise Linux 5 is required for a Sun Fire X4600 M2 system equipped with AMD Opteron processors codenamed "Shanghai"? Which update release and architecture of Red Hat Enterprise Linux 4 is required for a Sun Fire X4600 M2 system equipped with AMD Opteron processors codenamed "Shanghai"?Which Update release and architecture of Red Hat Enterprise Linux 4 are required for a Sun Fire X4600 M2 system equipped with AMD Opteron processors codenamed "Barcelona" and/or more than 64GB of RAM? Vendor: Sun Microsystems, Inc.