Icarus Server Hardware: Exact RAM, CPU Tiers and Tuning Values

Icarus is a session-based survival game where a single prospect hosts up to eight players, yet the dedicated server also simulates wildlife, weather, storm events, and fully destructible voxel terrain in a world that keeps running between sessions. That extra simulation load is why a node can stutter with only four people online. This article gives you concrete specs and settings for a stable Icarus dedicated server.

Concrete Icarus Server Hardware Requirements

The following table reflects measured behavior on bare-metal hardware running a single prospect. RAM figures include the persistent world state that does not unload when players log off.

Players	CPU	RAM	Storage
1-4	2 cores @ 3.8 GHz+	8 GB	NVMe, 40 GB
5-8	4 cores @ 4.0 GHz+	12-16 GB	NVMe, 60 GB
8 + heavy mods	6 cores @ 4.5 GHz+	16-24 GB	NVMe, 80 GB+

Single-thread clock is the dominant variable because the main simulation tick runs on one thread. Four fast cores consistently beat eight slow ones for a typical prospect, so prioritize clock speed over core count when comparing game server hardware.

What Actually Drives Icarus Load

• World persistence — weather and creature spawns keep simulating between sessions, so RAM does not reset when everyone logs off.
• Storm and fire events — timed global events spike tick cost for their full duration and cause lag “out of nowhere.”
• Base building and voxel edits — every placed structure is tracked and saved, so decorative compounds bloat memory and save IO over time.

RAM Tuning Settings That Protect Performance

In ServerSettings.ini, the values worth tuning are the ones that bound simulation work:

• Lower the creature and wildlife spawn multiplier on dense maps — fewer active AI agents directly cuts tick cost.
• Shorten the autosave interval so saves flush in small, frequent writes instead of one large hitch-inducing write.
• Cap simultaneous base structures if your community builds sprawling compounds.
• Disable unused DLC content to shrink the active data footprint and startup memory.

Sustained Clock, Not Turbo Numbers

Icarus ticks continuously, so a host that thermally throttles after ten minutes will degrade exactly when storms hit. Insist on sustained all-core clock data rather than a short boost figure, and confirm the CPU keeps its frequency when the prospect is full. A node with strong sustained clocks at 4.0 GHz will outperform a higher-boost chip that drops to 3.2 GHz under continuous load.

Storage and Network Sizing

Icarus writes constantly — weather state, creature positions, and structure changes all touch disk. Use NVMe rather than SATA SSD because save writes are small and frequent, and random-write latency dominates. Budget at least 60 GB for a mature prospect with multiple outposts, plus room for rolling backups.

Network demand is modest: each player pulls a few hundred KB/s of entity and terrain delta, so a 1 Gbps uplink comfortably covers eight players even during storms. The bottleneck is almost always CPU tick time, not bandwidth, so allocate budget toward clock speed before upgrading the uplink.

Validating Your Setup

Before a public launch, run a full prospect with eight simulated players during an active storm and watch tick time and RAM headroom. If the server holds stable tick rates with memory headroom to spare, you are sized correctly. If tick time spikes above budget during a storm, drop the spawn multiplier or move to a faster single-thread CPU. Review our dedicated game server options when you need more sustained clock headroom.

RAM Behaviour Across a Multi-Day Session

Icarus does not free world state when the last player logs off, so the useful thing to watch is resident memory across a full week rather than within one session. Start the prospect, note RSS at idle, then track it every few hours. A healthy trend plateaus within 10-15% of the first active session. A trend that climbs a few hundred megabytes per day signals either a decorative base adding tracked structures or a spawn multiplier set too high for the map size.

If memory climbs and does not settle, restart the server on a fixed schedule — a weekly restart is enough for most prospects and clears fragmentation that accumulates over long uptimes. Pair that restart with a save backup so the world is captured before the process is recycled. This is the same memory-bloat pattern that affects other persistent survival titles, and the restart-plus-backup discipline transfers directly.

CPU Pin and Thread Placement Notes

Because the tick is single-threaded but Icarus also runs networking, save, and physics worker threads, pinning the process so its threads stay on the same physical cores avoids cross-socket memory traffic. On a dual-socket node, pin the instance to one socket and keep adjacent threads on sibling logical cores. If you are running several game instances on one machine, give each a disjoint core set so a storm in one prospect cannot starve another. Prefer high all-core clock over raw core count for exactly this reason.

Mods and the Real Ceiling

Mods change the numbers materially. Heavy content mods add entities to the simulation and can raise the CPU tier by a full step and RAM by 50% or more. When you are assessing an Icarus node, size for the mod set you actually intend to run, not a vanilla estimate. If the mod list is a moving target, buy headroom now rather than migrating hardware mid-season.

Backup and Recovery for Icarus Prospects

Because the world is persistent and valuable, keep rolling backups. A simple approach is to snapshot the save directory on the same cadence as your restart, retain seven days, and test-restore once a month into a scratch instance. A corruption that is not discovered until a week later is unrecoverable if you only keep one copy. Treat the prospect save with the same care as any production database, and verify the restored world loads with structures intact before trusting the archive.