# Hacknet Servers

This is a very powerful upgrade to [Hacknet Nodes](../basic/hacknet_nodes.md). It is unlocked in BitNode 9.

Instead of producing money, Hacknet servers produce `hash`. This currency can be exchanged for a variety of upgrades that boost most other mechanics of the game.

We can run scripts on them, but it reduces the amount of `hash` produced.

There are 5 multipliers that affect them:

- `hacknet_node_money` affects the hash production rate.
- `hacknet_node_purchase_cost` affects the cost of purchasing a server.
- `hacknet_node_ram_cost` affects the cost of upgrading RAM.
- `hacknet_node_core_cost` affects the cost of upgrading core.
- `hacknet_node_level_cost` affects the cost of upgrading level.

There is no multiplier that affects the cost of upgrading cache.