Running a Minecraft server on ARM used to be a niche experiment for tinkerers with a Raspberry Pi and a lot of patience. That changed. Between Oracle Cloud’s Always Free Ampere A1 instances, the Raspberry Pi 5, and Apple Silicon Macs, ARM hardware is now a genuinely practical, and sometimes completely free, way to host a small or mid-sized Minecraft world. This guide exists to help you decide whether ARM is right for your server, and to walk you through every step if it is.

It is written for server owners, admins, plugin developers, and community staff who want real numbers instead of marketing claims. Whether you are standing up a survival server for ten friends, a test box for a plugin you are coding, or a budget workshop world, the goal here is to save you time, money, and the frustration of a laggy tick loop. Every recommendation below is meant to be actionable the moment you finish reading.

How this came to be: we ran Paper and Purpur on an Oracle Cloud Ampere A1 instance (4 OCPU and 24 GB of RAM), a Raspberry Pi 4 (8 GB), and a Raspberry Pi 5 (8 GB), measured tick times under real player load, and compared them against equivalent x86 VPS plans. We also tracked the cost of each option over a full year. Nothing here is theoretical, and where ARM falls short we say so plainly.

What ARM Is and Why It Matters for Minecraft Servers Now

ARM is a CPU architecture that uses a reduced instruction set (RISC). It powers almost every phone and tablet on the planet, and it has quietly become a serious server platform through chips like Ampere’s Altra and AmpereOne families and, more recently, cloud instances built on them. The reason it matters for Minecraft is simple: the Minecraft server is a Java program, and Java runs on ARM just as well as it does on x86. There is no rewrite required, no emulation tax, and no vendor lock-in to a specific host.

What makes ARM interesting is economics. ARM chips are efficient and often cheaper per core, which is why Oracle gives them away in its free tier and why a Raspberry Pi costs less than a single month of many hosted plans. If your server is small, ARM can cut your bill to zero or near zero. If it is huge, ARM’s weaker peak single-thread performance becomes the deciding factor, and we will show you exactly where that line falls.

The Three ARM Platforms That Matter in 2026

• Oracle Cloud Ampere A1 (Always Free). The headline act. Oracle’s Always Free tier includes up to 4 OCPUs and 24 GB of RAM on Ampere A1 compute, split across one to four instances, with no time limit. That is enough to run a comfortable public server for free.
• Raspberry Pi 4 and Pi 5. The Pi 4 (4 or 8 GB) is the classic budget contender. The Pi 5 (4, 8, or 16 GB) roughly doubles the CPU performance of the Pi 4 and is a real step up for a small private server.
• Apple Silicon (M-series Macs). Great for local plugin development and single-player testing. macOS and the ARM-native JDKs let you reproduce production behavior without renting anything.

A fourth option, ARM instances from providers like Hetzner or AWS Graviton, is also growing, but Oracle’s free tier and the Raspberry Pi dominate the conversation for hobby and small-community servers. If you are still deciding on an operating system, our guide to the The Best Linux Distros for Hosting a Minecraft Server in 2026 covers the choices in depth, and most ARM-friendly distributions, such as Ubuntu Server or Debian, are excellent for Minecraft.

Java on ARM: Which Builds Actually Work

The single biggest compatibility question on ARM is the JDK. The good news is that every mainstream OpenJDK distribution now ships a native aarch64 (ARM64) build, so you almost never need to compile anything yourself. Since Minecraft 1.18 the server has required Java 17, and recent versions strongly recommend Java 21. Match your Java version to your Minecraft version before anything else.

These JDK builds run reliably on ARM64 and are the ones we tested:

• Eclipse Temurin (Adoptium). The community standard and the safest default. Native ARM64 builds for Java 17 and 21. Download from adoptium.net.
• Azul Zulu. Excellent ARM64 coverage, including optimized Prime builds. A strong pick on Oracle Cloud and Pi. See azul.com/downloads.
• Amazon Corretto. Free, long-term supported, with ARM64 builds that work well in cloud environments.
• GraalVM. Useful if you experiment with native compilation or want faster startup. Available for ARM64 from graalvm.org.

Installation on Debian and Ubuntu is trivial. On a Raspberry Pi you can often just install the packaged OpenJDK, while on Oracle Cloud we prefer to download a known Temurin or Zulu tarball so the version never drifts with a system update.

Aikar’s Flags on ARM: What Carries Over and What Does Not

Aikar’s flags are the gold standard for tuning a Paper server, and the good news is that the core of them works on ARM64. The garbage collector they select (G1GC) has a well-tested aarch64 implementation, so the memory-tuning half of the flags translates cleanly. There are, however, a few caveats worth knowing before you copy-paste.

• Do not hardcode thread counts. Flags that assume a specific processor count can misbehave. Let the JVM detect cores, or set -XX:ActiveProcessorCount deliberately to match the cores you actually have. On Oracle Ampere A1, a 4 OCPU shape presents as 8 vCPUs thanks to simultaneous multithreading, which surprises people.
• Check huge-page options. Transparent huge pages behave differently on ARM, and some hosts manage them for you. If you see warnings during startup, drop the relevant flag rather than fighting it.
• Allocate conservatively. ARM boards like the Pi share memory bandwidth and have less headroom. Leaving memory for the OS matters more here than on a fat x86 box. The official reference is always the Paper documentation on Aikar’s flags, and it is worth reading against your specific hardware.

Paper, Purpur, and Plugin Support on ARM

Paper and Purpur are pure Java and run on ARM with the standard server jar, no special build required. Paper’s performance patches apply identically because they are bytecode and configuration changes, not native code. For most server owners, Paper is the right default.

Plugin compatibility is generally excellent, because plugins are compiled to portable Java bytecode. The exceptions are narrow but real. Any plugin that bundles a native shared library compiled for x86 will fail on ARM. This mostly affects tools that wrap C libraries, such as certain image renderers, some database drivers that ship native code, and older cryptographic helpers. Before you commit to ARM, scan your plugin list for anything that mentions native libraries or platform-specific binaries.

Oracle Cloud Free Tier: Getting an Ampere A1 Instance

Oracle’s Always Free tier is the most generous free compute offer available for a Minecraft server, and it uses ARM. You get up to 4 Ampere A1 OCPUs and 24 GB of RAM, which you can provision as a single 4 OCPU / 24 GB instance or split across up to four smaller ones. This is free with no expiration, though Oracle can reclaim idle resources under clearly stated policies, so keep the instance in use.

1. Create an Oracle Cloud account and sign in to the console.
2. Open Compute and choose Create Instance. Pick the Ampere A1 shape (VM.Standard.A1.Flex).
3. Set the OCPU and memory sliders. For a single server, 4 OCPU and 24 GB is the classic choice.
4. Select an image. Ubuntu Server 24.04 is a safe, well-documented pick.
5. Add your SSH public key and create the instance.
6. In the VCN security list and any network security group, open inbound TCP port 25565 for Minecraft.
7. Open the OS firewall too. Ubuntu images ship with iptables rules that block the port even after the cloud rule is set.
8. SSH in, install your JDK, upload the server jar, accept the EULA, and start the server.

One practical reality: Ampere capacity is popular, and you may hit an “Out of host capacity” message when you try to launch. The fixes are to try a different availability domain, try a smaller shape, or retry over time and at off-peak hours. Capacity in some regions is genuinely tight, so be patient. Once you have a running instance, the service itself is stable and the performance is excellent for the price, which is zero. The official details live on the Oracle Cloud Free Tier page.

Raspberry Pi 4 vs Raspberry Pi 5 for a Minecraft Server

The Raspberry Pi is the other great ARM option, and it is ideal if you want a server that lives on your desk, uses almost no power, and is entirely under your control. The Pi 5 is a clear upgrade over the Pi 4 for Minecraft because single-thread performance is what matters most, and the Pi 5 delivers roughly double the CPU throughput of the Pi 4.

Storage, Cooling, and Power

• Ditch the SD card. This is the most important Pi tip. SD cards die quickly under a Minecraft server’s constant writes. Boot from a USB 3.0 SSD, or use an NVMe HAT on the Pi 5. Your world will thank you with lower chunk-save lag and much better durability.
• Cool it properly. The Pi 5 runs hot and will throttle without its official active cooler or an equivalent heatsink-and-fan. The Pi 4 benefits from a simple heatsink and small fan. Throttling directly hurts your tick times.
• Use the right power supply. The Pi 5 wants a 5V 5A (27W) supply. An underpowered supply causes brownouts and random crashes that look like software bugs.
• Consider a UPS. A small uninterruptible power supply prevents corruption during power cuts and is worth the modest cost for a world you care about.

Realistic Player Counts on ARM

Player count depends far more on simulation distance, entity counts, and farm density than on the raw number of accounts. With tuned Paper settings, expect around 2 to 5 players on a Pi 4, 5 to 10 on a Pi 5, and 20 to 40 or more on an Oracle Ampere A1 4 OCPU instance. Drop simulation distance to 4 and keep view distance modest on the Pi, and the experience stays smooth for a tight group of friends.

Benchmarks and Realistic Expectations

Minecraft’s main thread is the bottleneck. The server must deliver a tick every 50 milliseconds, and most of that work is single-threaded: entity AI, redstone, block updates, and chunk logic all run on one core. That is why single-thread performance matters far more than core count, and it is exactly where ARM gives ground to x86. The numbers below are approximate and drawn from our own tests plus public Geekbench data.

Where ARM Falls Short

• Peak single-thread speed. Modern x86 cores still win decisively on the one core that runs the main tick loop. This caps how much redstone, mob AI, and entity density you can throw at ARM.
• Memory bandwidth. Small boards share bandwidth between CPU and GPU, which hurts chunk-heavy workloads.
• Chunk generation bursts. A fresh world or a fast-traveling player creates spikes that expose the weaker core.
• Heavy modpacks. Large kitchen-sink packs are CPU-hungry and often feel sluggish on a Pi. Vanilla and light Paper setups are the sweet spot.
• Native plugins. Anything without an aarch64 build simply will not load.

For a deeper look at how CPU and memory interact to create lag, see our analysis CPU vs RAM: What Actually Stops Minecraft Lag in 2026?. The short version: buy single-thread performance before you buy more cores, and on ARM that principle is the whole ballgame.

When to Choose ARM vs x86

ARM is not a downgrade, it is a different trade-off. The question is not which is faster in the abstract, but which fits your players, your budget, and your ambitions.

• Choose ARM when: you run a small private or friends-only server, you need a free or near-free box, you want a test or development environment, you are learning Linux and networking, or you want a low-power always-on machine at home.
• Choose x86 when: you run a large public network, you host heavy modpacks, you run a Velocity or BungeeCord proxy with many backend servers, you need the highest possible player ceiling, or you depend on a plugin with native x86 only binaries.

Real-Cost Breakdown Over 12 Months

This is where ARM’s story gets compelling. The table below compares the total first-year cost of common options, including one-time hardware and estimated electricity.

Oracle’s free tier is the clear value winner, and the Pi wins if you want hardware you physically own. To put electricity and ownership costs in proper perspective, read The True Cost of Electricity: Is Self-Hosting a Minecraft Server Actually Cheaper?. And if free is the priority, our review of A Review of the Best Free Minecraft Hosting Services (and Their Hidden Costs) shows where “free” hosting usually hides limits that a self-managed ARM box does not.

Pros and Cons of Running a Minecraft Server on ARM

Pros

• Extremely low or zero cost, especially Oracle’s Always Free Ampere A1 tier.
• Low power draw, ideal for an always-on home server.
• Full Java and Paper compatibility with no emulation.
• Plenty of RAM per dollar, which helps with player count and chunk caching.
• Great for learning, testing, and plugin development.

Cons

• Weaker peak single-thread performance than x86, which caps big public servers.
• Some plugins with native libraries will not run.
• Cloud capacity for free ARM instances can be scarce at times.
• Home boards need attention to storage, cooling, and power to stay stable.
• Fewer turnkey guides and hosting panels are built around ARM.

Common Mistakes and Expert Tips

• Running from an SD card. It is the number one cause of corruption and lag on a Pi. Use an SSD.
• Assuming more cores help. They often do not. Minecraft needs fast cores, not many.
• Copying Aikar’s flags without checking them. Tune for your actual core count and memory, and read the Paper docs.
• Leaving the OS firewall closed. The cloud port is open but iptables still blocks 25565 on many Ubuntu images.
• Overloading spawn. A dense spawn area with hundreds of entities will tank any ARM board. Keep spawn lean.
• Ignoring simulation distance. Lowering it is the single biggest, cheapest performance win on ARM.
• Forgetting backups. Automate world backups off the device. Free or cheap hardware still holds data you will miss.

Expert tip: pre-generate your world before opening it to players. Pre-generation moves the expensive chunk-generation burst to a quiet moment instead of during a busy session, and it makes ARM hardware feel dramatically smoother. Paper’s built-in chunk pre-generation commands, covered in the Paper documentation, make this straightforward.

Frequently Asked Questions

Conclusion: ARM Is a Real Option, and Often the Smartest One

ARM has crossed the line from hobby curiosity to legitimate Minecraft hosting platform. Oracle’s Always Free Ampere A1 gives small communities a genuinely free, capable server, and the Raspberry Pi 5 gives tinkerers a low-power machine they own outright. Java, Paper, and Purpur all run natively, and the cost math is unbeatable at small scale. Where ARM loses, it loses honestly: peak single-thread speed caps the biggest servers, so if you run a large public network or heavy modpacks, an x86 VPS remains the better tool.

Your next step is simple. If you want free, head to the Oracle Cloud console, launch an Ampere A1 instance, open port 25565, install Temurin Java, and drop in Paper. If you want to own your hardware, order a Raspberry Pi 5 with a 27W supply, an SSD, and active cooling, then follow the same setup. Either way, tune your Aikar’s flags, pre-generate your world, and keep your spawn lean. That is how you turn cheap ARM hardware into a server your community actually enjoys.