documentation: Makes it clear that BELLMAN_CUSTOM_GPU is an environment variable

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@wwwjim 2019-12-18 14:34:28 -08:00
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@ -33,13 +33,13 @@ GPUs are a must for getting **block rewards**. Here are a few that have been con
## Testing other GPUs
If you want to test a GPU that is not explicitly supported, you can use the following configuration flag:
If you want to test a GPU that is not explicitly supported, use the following global**environment variable**:
```sh
BELLMAN_CUSTOM_GPU="<NAME>:<NUMBER_OF_CORES>"
```
Here is an example of trying a GeForce GTX 1660 ti with 1536 cores.
Here is an example of trying a GeForce GTX 1660 Ti with 1536 cores.
```sh
BELLMAN_CUSTOM_GPU="GeForce GTX 1660 Ti:1536"