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Detta är från deras support
Depending on the model of the power supply, there may be some options available for use with your PSU. Any E and C-Series Power Supplies that have a model number starting with NP- or that specifically list the manufacturer as Seasonic will be compatible with any cable kits designed for Seasonic's Focus GX series of Power Supplies.
Kanske lättare att få tag i Seasonic GX kablar?