Vault Hunters is the one pack where the RAM you need depends on how many people are playing at the same moment, not on the pack itself. That is unusual, and the authors are explicit about it.
Minecraft plans are priced per GB, so you pay for the memory you actually need.
The wiki's own figure for two players. Older core, so keep the group small.
10GB at $0.85/GB
Around three concurrent players on current hardware.
12GB at $2.00/GB
The wiki's six-or-more-players allocation.
16GB at $2.75/GB
Most packs get sized by guesswork. Vault Hunters does not need to be, because the official wiki publishes a formula. Its minimum is 6GB base plus 2GB per concurrent player, with the worked example given as 10GB for two players and 12GB for three. The recommended figure is 8GB base plus 2GB per player.
The wiki also gives allocations directly: 2 to 3 players at -Xms6G -Xmx10G, 4 to 5 players at -Xms8G -Xmx14G, and 6 or more at -Xms10G -Xmx16G or higher. Those are the numbers our plan sizes above are built from, rather than a figure we made up. It also asks for at least 5GB of free disk and an SSD for world loading, which every plan here has.
Note the shape of it. Cost scales with people playing at the same time, not with people who have accounts. A ten-person group where three play on a weeknight is a three-player server.
Every vault is its own dimension. Opening a crystal generates a fresh, randomly built vault in the vault dimension, and a timer of about 25 minutes runs from when you leave the first room. So three people running vaults at once means three freshly generated dimensions alive together, on top of the overworld. That is the mechanical reason the wiki charges you 2GB a head.
Generating those vaults is also the heaviest thing the server does. The developers rewrote it in 3.18.2 and reported an 8 times faster load time and 80 times faster vault chunk generation, which tells you how expensive it was before. Even now, entering a vault is a burst of world generation on the main thread, and the main thread is single-threaded. Clock speed decides how long that burst stalls everyone else.
Supreme and Ultimate run on Ryzen 7 7700 or equivalent for that reason. Budget is a 2017 EPYC 7451, which is why the card above suggests keeping the group small on it.
Vault Hunters is one of the few packs where you can trade memory against lag spikes on purpose. The pack ships a vaultPreloadTemplates option, off by default, which the patch notes describe as removing lag spikes at the cost of higher RAM use. There is also a vaultTemplateCacheSize gamerule, default 32. If you have headroom, spending it here buys smoother vault entry.
The wiki also advises automatic restarts every 6 to 12 hours, and names OutOfMemoryError as a known failure mode with the fix being a larger heap. Both are arguments for sizing at the recommended figure rather than the minimum.
Vault Hunters is Minecraft 1.18.2 on Forge and needs Java 17 specifically, not 8, 11 or newer. There are currently two live packs from the same team: Vault Hunters Third Edition, and a Remastered version whose patch notes say the removed mods are expected to improve performance by 10 to 15 percent. They are different mod lists, so pick one and keep everyone on it.
One setup detail that catches people out: client-only mods have to be removed from the server or it will not start. The pack's own start script deletes legendarytooltips, torohealth and rubidium for exactly that reason. Everyone joining needs the same pack version as the server.
Installing from a specific build or bringing a world across is covered in installing a custom or unlisted modpack. Sizing a different pack? See All the Mods 10 or Create hosting.
The official wiki gives 6GB base plus 2GB per concurrent player as the minimum, and 8GB base plus 2GB per player as recommended. Its own examples are 10GB for two players and 12GB for three.
Because every vault is a separate, freshly generated dimension with a roughly 25 minute timer. Three people running vaults at once means three live dimensions plus the overworld.
Minecraft 1.18.2 on Forge. It requires Java 17 specifically, not Java 8, 11 or newer.
They are two live packs from the same team with different mod lists. The Remastered patch notes state the removed mods are expected to improve pack performance by 10 to 15 percent. Pick one and keep the whole group on it.
Entering a vault generates a new dimension, and world generation runs on the server's single main thread. The developers made it around 80 times faster in 3.18.2, but it is still a burst of work where clock speed decides the length of the pause.
The official wiki advises automatic restarts every 6 to 12 hours, and lists OutOfMemoryError as a known failure mode. Sizing at the recommended figure rather than the minimum reduces both.