[Home](./index.md) > [bitburner](./bitburner.md) > [Hacknet](./bitburner.hacknet.md) > [upgradeCache](./bitburner.hacknet.upgradecache.md) ## Hacknet.upgradeCache() method Upgrade the cache of a hacknet node. Signature: ```typescript upgradeCache(index: number, n: number): boolean; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | index | number | Index/Identifier of Hacknet Node. | | n | number | Number of cache levels to purchase. Must be positive. Rounded to nearest integer. | Returns: boolean True if the Hacknet Node’s cores are successfully purchased, false otherwise. ## Remarks RAM cost: 0 GB This function is only applicable for Hacknet Servers (the upgraded version of a Hacknet Node). Tries to upgrade the specified Hacknet Server’s cache n times. Returns true if it successfully upgrades the Server’s cache n times, or if it purchases some positive amount and the Server reaches its max cache level. Returns false otherwise.