You'd have to contact Rosewill customer support. Modular power cables are not standardized (so 8-pin to 8-pin is rather meaningless, it's just an 8-pin connector that works with the Rosewill Glacier) so you'd need a cable that is guaranteed to work with this *exact* PSU. You're very unlikely to find anything aftermarket; this is only really a thing with a few, hobbyist-friendly quality PSUs.