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Running x86_64 Apps on an AArch64 Desktop: A FEX-Emu Experiment

2025-08-07

This post details an experiment running x86-64 applications on an Ampere Altra-based AArch64 desktop system using FEX-emu. While Steam and Factorio ran, performance was poor, scoring a measly 459 and 4110 on Geekbench 6's single and multi-core tests respectively. Optimizations to FEX-emu's configuration and replacing the x86_64 version of the Ninja build tool with an aarch64 version yielded some performance improvements. Ultimately, the author concludes that x86_64 emulation on this AArch64 system is limited in practicality, primarily useful for running older games.

Budget Ampere Altra Dev Machine Build

2025-06-30

Needing a development machine with 64k page size support, the author built a system based on Ampere Altra. He chose an AsrockRack ALTRA8BUD-1L2T motherboard, a used Q80-30 processor (80 cores, 3.0 GHz), an Arctic Freezer 4U-M cooler, and eight 16GB SK Hynix HMA82GR7CJR8N-XN RAM sticks. After some troubleshooting, the system booted successfully. He also selected a suitable case and power supply, adding NVME storage and a graphics card. The total cost was around €1800, slightly over budget. Future plans include installing Fedora 42, creating RHEL and CentOS Stream VMs, experimenting with different GPUs, and desktop usage.