Hello,
Thank you for posting in Microsoft Community forum.
Windows Home Server 2011 (WHS 2011) is quite dated, and its hardware compatibility is limited to older chipsets and CPUs. The newest Intel chipset and CPU that WHS 2011 can support are from the LGA 2011 socket series, specifically the Sandy Bridge-E and Ivy Bridge-E processors. These processors are compatible with the Intel X79 chipset.
Here are some options you can consider for upgrading your WHS 2011 system:
Intel Core i7-3960X Extreme Edition: 6 cores, 12 threads, base frequency of 3.30 GHz, and max frequency of 3.90 GHz.
Intel Core i7-3930K: 6 cores, 12 threads, base frequency of 3.20 GHz, and max frequency of 3.80 GHz.
Intel Xeon E5-2600 series: These processors offer more cores and threads, which can be beneficial for server tasks.
You might need to update your motherboard's BIOS to ensure compatibility with these newer processors. Additionally, WHS 2011 supports up to 8 GB of RAM, so make sure your new setup adheres to this limitation.