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We regret to inform that the Intel AXX6DRV3GR and AXX4DRV3GR is currently in End of Interactive Support (EOIS). This means that Intel no longer provides interactive support for this service via telephone, e-mail, chat, or other tools. Technical articles will continue to be available on the Intel Support website.
Those backplanes do not provide that kind of support associated with Power Disable Pin.