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[Home ](./index.md ) > [bitburner ](./bitburner.md ) > [Hacknet ](./bitburner.hacknet.md ) > [getCacheUpgradeCost ](./bitburner.hacknet.getcacheupgradecost.md )
## Hacknet.getCacheUpgradeCost() method
Calculate the cost of upgrading hacknet node cache.
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**Signature:**
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```typescript
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getCacheUpgradeCost(index: number, n?: number): number;
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```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| index | number | Index/Identifier of Hacknet Node. |
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| n | number | _(Optional)_ Number of times to upgrade cache. Must be positive. Will be rounded to the nearest integer. Defaults to 1 if not specified. |
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**Returns:**
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number
Cost of upgrading the specified Hacknet Node's cache.
## Remarks
RAM cost: 0 GB
This function is only applicable for Hacknet Servers (the upgraded version of a Hacknet Node).
Returns the cost of upgrading the cache level of the specified Hacknet Server by n.
If an invalid value for n is provided, then this function returns 0. If the specified Hacknet Node is already at max level, then Infinity is returned.
