Due to Intel® Xeon® Processor E5-2403 being discontinued, Intel Customer Service no longer supports inquiries for it, but perhaps fellow community members have the knowledge to jump in and help.
You may also find the Discontinued Products website helpful to address your request.
Discontinued Products website
Support information for Intel® Xeon® Processor E5 Family
In addition, I found a support ticket with a similar inquiry in which Intel Customer Support has provided a document that addresses your request. For this reason, I will proceed to close this thread.
Thank you for your understanding.
Intel Customer Support Technician