With it’s 8 pins this connector can provide up to 150W per cable. A graphics card with a single 6+2-pin connector can draw up to 225W (75W from the motherboard + 150W from the cable). More expensive graphic cards require the 6+2 pin PCI-E connector. So if your Graphic card contains a single 6-pin connectors it can draw up to 150W (75W from the motherboard + 75W from the cable). The PCI-E 6-pin connector can supply an additional 75W per cable. The left 2 pins of the 6+2 pin connector on the right is detached to provide backwards compatibility with 6-pin graphic cards. To solve that issue the PCI-E connector was introduced. Faster dedicated graphics cards require much more power.
The motherboard can provide a maximum of 75W through its PCI-E interface slot. It is also possible that your 8-pin cable can be split into two segments to provide backwards compatibility with cheaper motherboards. Obviously you only need to use one of these cables. Most PSU’s provide two cables one with 4-pins and one with 8-pins. For regular usage there is absolutely no need for the additional pins. The extra 4 pins ensure that enough power can be provided to the cpu when overclocking. More expensive “overclocking” motherboards have 8-pin connectors. Nowadays it is the P4, or EPS connector, to provide the cpu with power.Ĭheap motherboards are equipped with a 4-pins connector. With overclocked cpu’s drawing as much as 200W a need to provide power directly to the CPU was created. P4 (EPS Connector)Īt some point in time the motherboard’s pins were no longer sufficient to provide the processor (cpu) with power.
A 24-pins cable is backwards compatible with a 20-pins motherboard, often this cable can be split into 20- and 4-pins (like in the image above).
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