Are the Intel Xeon 7400 series processors supported on my Sun Fire X4450?

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Support for the Xeon 7400 series processor on the Sun Fire X4450 was introduced in Red Hat Enterprise Linux 4.7 and Red Hat Enterprise Linux 5.3. Please use those update versions or newer if you wish to use Xeon 7400 series processors on this system.

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Are the Intel Xeon 7400 series processors supported on my Sun Fire X4450?