The most slimmest GTX1050 low profile version I think is offered by MSI, but even MSI one requires dual half-height PCI slot. But sadly I think Inspiron 660s the PCI slot is upside down, means you only can use a single slot card for your PC. And I am not aware of any card that are running on single slot. ...Well there's actually a Galax GTX1070 Katana single slot version. But it doesn't offer half-height version, and it can't be fitted into your PC. So yeah there's not really any 10 series card can fit into your model at the moment.