SUN FIRE X4540 Certifications Product Versions Level Red Hat Enterprise Linux (x86_64) 5.1 - 5.x Certified [1] Additional Notes Which Update release of Red Hat Enterprise Linux 5 is required for a Sun Fire X4540 system equipped with AMD Opteron processors codenamed "Shanghai"?What are the minimum update releases of RHEL 4 and 5 required to support Sun Microsystems / Oracle America computers equipped with AMD 6-core processors codenamed "Istanbul"? Vendor: Sun Microsystems, Inc.