If you are upgrading from an early Haswell chip (like an i5-4440) to a "Haswell Refresh" chip (like the i7-4790), ensure your BIOS is updated to the latest version available on the Acer Support Site .
The MS7869 Ver 10 motherboard boasts an impressive CPU support list, with verified compatibility for a wide range of processors from both Intel and AMD. Here are some of the key CPU models that are verified to work with the MS7869 Ver 10:
While some Intel Xeon E3-1200 v3 processors (like the Xeon E3-1241 v3) may physically fit and boot, they are not officially supported
If a new CPU fails:
[Insert Date] Subject: MS-7869 (PCB Version 10) – Verified CPU Compatibility List