---
title: peerGroupID
framework: metal
role: symbol
role_heading: Instance Property
path: metal/mtldevice/peergroupid
---

# peerGroupID

The peer group ID the GPU belongs to, if applicable.

## Declaration

```swift
var peerGroupID: UInt64 { get }
```

## Mentioned in

Transferring data between connected GPUs

## Discussion

Discussion A group ID value of 0 indicates the GPU isn’t in a peer group. Otherwise, the GPU is in a peer group and the value is the group’s ID. All other GPUs in the same peer group have the same group ID.

## See Also

### Identifying a GPU device

- [name](metal/mtldevice/name.md)
- [architecture](metal/mtldevice/architecture.md)
- [MTLArchitecture](metal/mtlarchitecture.md)
- [registryID](metal/mtldevice/registryid.md)
- [location](metal/mtldevice/location.md)
- [MTLDeviceLocation](metal/mtldevicelocation.md)
- [locationNumber](metal/mtldevice/locationnumber.md)
- [isLowPower](metal/mtldevice/islowpower.md)
- [isRemovable](metal/mtldevice/isremovable.md)
- [isHeadless](metal/mtldevice/isheadless.md)
- [peerCount](metal/mtldevice/peercount.md)
- [peerIndex](metal/mtldevice/peerindex.md)