What connectors are on each rail is not specified, but on such power supply my guess would be that the 24 pin connector and the CPU power is on first rail, and peripherals (sata and old hdd connectors / molex) and the pci-e 6pin are on second rail. This amount of power is split into two voltage rails which are limited to some amount of power: maximum 17A on first rail (204w) and maximum 15A on second rail (180w) The power supply says it can provide 32A on 12v - that's 384 watts. You have the "datasheet" here : fsp russia link to datasheet in pdf format The lack of a 8 pin connector on your power supply is often an indicator that the power supply was not meant to be used with very power hungry video cards but also sometimes the power supply manufacturer intentionally puts only a 6 pin connector to make the higher 500w / 550w models more appealing, as those would be more profitable for them. Check the label, it will say how much it can supply : you can divide watts by voltage to get current. So your power supply should be able to provide AT LEAST 250 watts on 12v out of those 400 watts. it must be able to do 125w for the video card, maybe 60-100w for your cpu, maybe around 10-15w for the motherboard, maybe 5w for the fans (cpu cooler, extra fans), maybe 5w for your hard drive motor. The power supply should be able to supply the wattage on 12v. You could trick the video card into thinking it's a 8 pin connector by shorting the ground pins in the connector, or you could just a 6 pin to 8 pin adapter cable, or a 2 x molex -> pci-e 8 pin adapter cable. The video card will detect that you don't have a 8 pin connector plugged in and will probably refuse to start. So by using an 8 pin connector, they have at least 80w of headroom in case user wants to overclock. For example, if they use 6pin on gtx 1060, that's 75w on connector, and 50w on slot, leaving just 10 watts for overclocking, which is kinda low. Sometimes the manufacturer uses an 8 pin connector to allow room for overclocking and reduce the "stress" on the motherboard slot. for example, they could take 100w from the pci-e 8 pin connector and only 25w from the pci-e slot. Some designs may chose to lean more on the pci-e connector and take less from the pci-e slot. Some designs may take some amount of power from the pci-e slot ( up to 65w on 12v and 10w on 3.3v) and the rest from a pci-e 6pin connector.
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