No, the cable cannot be used the other way round. It has a 12VHPWR connector on one side and two 8-pin PCI-E connectors on the other, which are specially designed for connection to the power supply and do not fit into a graphics card.

Hello Patrick According to the supplied product data, the Deepcool cable has an 8-pin EPS connector, while the be quiet! Dark Power Pro 11 power supply requires modular PCIe connectors. The compatibility between the Deepcool cable and your power supply is not directly apparent as the connector types do not match. Official 12VHPWR cables for be quiet! power supplies (e.g. the model mentioned in the search results) are specially designed for their PCIe sockets and require at least two PCIe connectors on the power supply. For the RTX 4090, be quiet! also recommends power supplies from 850W, although the Dark Power Pro 11 is not explicitly listed as compatible in the search results. As the exact specification of the Deepcool cable is not available in full and the connection configuration is unclear, you should take the precaution of using the official be quiet! adapter cable or a cable approved by the power supply manufacturer to avoid the risk of cable breakage or overheating. If you are unsure, it is best to contact Deepcool support to confirm the compatibility of the GP-PCI-E-12VHPWR cable with your specific power supply model.