[Home](./index.md) > [bitburner](./bitburner.md) > [NS](./bitburner.ns.md) > [upgradePurchasedServer](./bitburner.ns.upgradepurchasedserver.md) ## NS.upgradePurchasedServer() method Upgrade a purchased server's RAM. Signature: ```typescript upgradePurchasedServer(hostname: string, ram: number): boolean; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | hostname | string | Hostname of the server to upgrade. | | ram | number | Amount of RAM of the purchased server, in GB. Must be a power of 2 (2, 4, 8, 16, etc.). Maximum value of 1048576 (2^20). | Returns: boolean True if the upgrade succeeded, and false otherwise. ## Remarks RAM cost: 0.25 GB