rx 570 wrong senses

i have an rx570 8gb video card but sala only senses it as 4gb what can i do with it?

This is an issue with the detection API. It will not impact your earnings or the miner choice, so you can just leave it as-is for the moment.

This is just an issue with the API Salad uses to detect your VRAM, but it shouldn’t affect earnings, as long as your Salad is running PhoenixMiner.
You can check this by going to Earn → Miner Details → Current Miner