Garry’s Mod is one of the few games where the RAM question has a genuinely counterintuitive answer. You might expect a Source engine game from 2006 to be light on resources, but a physics sandbox that supports hundreds of Workshop addons, sprawling RP maps, and 128-player servers could reasonably demand a lot. In practice, it mostly doesn’t - at least not from RAM.
That doesn’t mean the answer is “grab whatever is cheapest and call it a day.” Gamemode, addon quality, and player count all shift the numbers. This guide breaks down what actually drives memory use in GMod and gives you concrete targets for each setup type.
Why GMod’s RAM Situation Is Unusual
The Garry’s Mod dedicated server (SRCDS) runs on the Source engine, which is fundamentally single-threaded. The server process uses two threads: one for networking, one for everything else. This architecture means GMod barely touches RAM compared to modern engines - actual memory usage on a running server is often surprisingly low.
Community data backs this up. A 64-player PropHunt server running at capacity has been documented using under 650MB of RAM. Reports from the Steam forums consistently show that even busy servers with 100+ Workshop addons rarely push past 2GB of actual memory use. The process just doesn’t need much.
What GMod actually needs
RAM is not the bottleneck. CPU single-core clock speed is. If your server is lagging, the cause is almost always high entity counts, physics calculations, or a slow or throttled CPU - not insufficient RAM. Adding more RAM to an underperforming server won’t help.
The reason to think about RAM allocation at all comes down to three things: overhead headroom for your OS and other processes, the memory footprint of your addon collection at startup, and buffer against addons that aren’t well-coded and accumulate memory over time.
The Variables That Move the Needle
Gamemode
This is the biggest factor. Lightweight gamemodes (TTT, PropHunt, Murder, Deathrun) load a small number of entities per round and don’t persist complex state. A full TTT server with 32 players and a few dozen addons might use 800MB-1.2GB at peak.
DarkRP is a different story - not because the gamemode itself is heavy, but because of what comes with it. Most DarkRP servers run 60-150 addons: inventory systems, custom job plugins, weapon bases like ArcCW or ARC9, car systems via Simfphys or Glide, admin mods, and more. The cumulative startup footprint of all of those Workshop addons loading into memory adds up, and a few poorly-coded ones can leak memory over long uptime sessions.
Military RP and other NutScript or Helix-derived gamemodes sit in a similar bracket to DarkRP - often heavier than vanilla RP setups because the player count expectations are higher and the addon stacks tend to be larger.
Sandbox is the hardest to pin down because usage varies so much with player behavior. A casual 10-player build server is light. A 40-player server where people are spawning vehicles, Wiremod contraptions, and hundreds of props is doing a lot of physics work - mostly CPU, but RAM follows.
Addon count and quality
The difference between a 30-addon server and a 200-addon server is real, but it’s not always linear. A clean 50-addon stack can use less memory than a bloated 100-addon stack where several plugins haven’t been updated in years and have memory leak issues.
Heavy addons to watch: Wiremod and Starfall add expression processors and components that accumulate in memory as players use them. ACF (Armored Combat Framework) is similarly entity-heavy. Large weapon packs and vehicle packs front-load memory at startup since all the models get indexed.
Map size and geometry
gm_construct and gm_flatgrass are small and barely register. Large RP maps - rp_downtown variants, rp_rockford, big MilRP maps - load more BSP geometry and prop data into memory. The difference between a small and large map is usually a few hundred MB at most, but it’s worth factoring in if you’re running a tight allocation.
Props and entities
High prop counts in Sandbox hit CPU first (physics calculations) but also bump memory as each entity is tracked. If your server culture involves people building elaborate contraptions or staging large-scale scenes, a slightly higher RAM buffer gives the server room to breathe during those sessions.
RAM by Gamemode and Player Count
These are practical allocations based on how these gamemodes actually behave, not the theoretical maximum the process could ever use. The goal is giving the server and OS enough room without over-provisioning for something GMod simply doesn’t need.
2GB - Light gamemodes, small player counts
Works for TTT, PropHunt, Murder, and Deathrun with up to 20-32 players and a moderate addon collection (under 50 addons). The server process might use 600MB-1GB; the remaining allocation covers OS processes and map load spikes. If you’re running a niche gamemode for a small friend group or a straightforward TTT community, this is enough.
3GB - Sandbox and mid-size community servers
A solid choice for Sandbox servers with 20-30 players, or TTT/PropHunt communities that have grown their addon collection beyond the basics. Also works for a lean DarkRP setup with a tight, well-maintained addon list. The extra GB over baseline gives you room for longer uptime without worrying about addons that slowly accumulate memory.
4GB - DarkRP with a standard addon stack
The most common starting point for DarkRP communities. A typical server in this category runs 40-80 addons, has a persistent database for player data, and expects 30-50 concurrent players. 4GB handles the startup footprint comfortably and gives the server room for memory that accumulates over a day’s worth of uptime before a restart.
At WinterNode, going from 3GB to 4GB is $1.99 more per month - it’s a low-cost buffer that eliminates a category of potential issues.
5-6GB - Heavy DarkRP, MilRP, and large Sandbox
For servers with 100+ addons, a vehicle system like Simfphys or Glide, Wiremod or ACF, and a player count that regularly fills 60+ slots, 5-6GB is a reasonable target. You’re mostly accounting for the cumulative startup footprint of a large Workshop collection and the runtime growth of addons that don’t free memory cleanly.
Addon quality matters more than addon count
We see this consistently: a server with 80 well-coded addons runs cleaner than one with 40 addons where a few have memory leaks. If your server’s memory use climbs steadily over several hours and drops after a restart, that’s a leak - and the fix is finding and replacing the problematic addon, not adding more RAM.
The CPU Point You Shouldn’t Skip
This comes up constantly in tickets and it’s worth stating plainly: if your GMod server is lagging, RAM is almost never the cause. The Source engine is single-threaded by design. Everything that matters - physics simulation, Lua script execution, entity updates - runs on one core. What determines whether that core can keep up is clock speed, not how much RAM the server has.
This is why unmetered CPU access matters for GMod hosting specifically. When your server hits a physics-heavy moment - a Wiremod contraption firing up, 40 players spawning props simultaneously, a DarkRP server at peak hours with a lot of active NPC interactions - it needs CPU cycles available, not more memory. WinterNode’s servers don’t meter or throttle CPU, so that single thread gets as much clock time as the hardware can give it.
If you’re troubleshooting lag on a GMod server, the things to look at are entity count, tick rate, and which addons are running Lua hooks on every tick. RAM utilization is usually the last thing on the list.
When You Might Actually Need More RAM
A few real scenarios where bumping allocation makes sense:
The server process climbs to near its allocation limit over 12-24 hours and drops back after a restart. This is a memory leak in one or more addons, and extra RAM buys you time between restarts while you track down the offender. It’s a workaround, not a fix - but it’s a practical one while you’re debugging.
Startup crashes or hangs when loading a very large Workshop collection. If your host_workshop_collection pulls in hundreds of addons and the server consistently dies at map load, the startup footprint is hitting the ceiling. More RAM addresses the root cause here.
Running multiple processes on the same node - a second GMod instance, a FastDL server, a MySQL database. These all share the node’s memory, and their combined footprint is what matters.
WinterNode’s Garry’s Mod hosting starts at $1.99/GB with no CPU metering - which, for a game that lives and dies by single-core performance, is worth a lot more than it sounds on paper. There’s no risk in trying it out; all game server plans come with a 48-hour refund policy.
Questions about your specific setup? Open a ticket or find us on Discord - we’re happy to talk through what makes sense for your gamemode and addon stack.
Frequently Asked Questions
Most GMod servers run comfortably on 2-4GB of RAM. Light gamemodes like TTT or PropHunt rarely exceed 1GB of actual usage. DarkRP servers with heavy addon stacks may need 4-6GB, but RAM is rarely the bottleneck - CPU single-core speed matters more.
A DarkRP server with a typical addon load (20-40 addons) runs well on 4GB. Heavy addon stacks with Wiremod, ACF, or bloated inventory systems may benefit from 5-6GB, mainly as a buffer against poorly-coded addons that leak memory over time.
Not meaningfully, past the baseline. GMod's Source engine is single-threaded, so performance bottlenecks almost always come from CPU clock speed, entity count, and addon quality. Adding RAM beyond what the server actually uses won't reduce lag.
For light gamemodes like TTT, PropHunt, and Deathrun, 2GB is enough for 20-32 players with moderate addons. For Sandbox or DarkRP with heavier addon collections, 3-4GB is a safer starting point.