If upgrading to an i7-4790, the stock Acer aluminum heatsink may be insufficient. It is recommended to use a high-quality copper-core cooler to prevent thermal throttling. Conclusion

4th Generation Intel Core (Haswell / Haswell Refresh) RAM Support: DDR3 / DDR3L (Up to 16GB total; 2 slots) Verified CPU Support List

The flagship for this socket. (Note: The "K" variant will work but cannot be overclocked due to the H81 chipset).

Frequently shipped as the stock CPU in Acer TC-605 units. 3. Entry-Level (Core i3, Pentium, Celeron) Intel Core i3-4130 / i3-4150 / i3-4170 Intel Pentium G3220 / G3258 Intel Celeron G1820 / G1840 4. Workstation Alternative (Xeon)

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 is an OEM motherboard manufactured by MSI, most commonly found in Acer Aspire TC-605 and Gateway DX4885 desktop systems. Because it is a proprietary board, finding an official "support list" is difficult, but compatibility is dictated by its Intel H81 chipset and LGA 1150 socket .

Below is the verified CPU support guide for the MS-7869 Ver 1.0 based on chipset limitations and real-world testing. Socket: LGA 1150 Chipset: Intel H81 Express

The original Haswell high-end option.