so you have 6 x 12v wires carrying 12v into the card which means each connector will take around 75 watts into the card, doesn't matter if it's 8 pin or 6 pin.The molex connectors are rated for 5A (5A x 12v = 60 watts). That means about 50 watts would probably be pulled from the pci-e slot, and about 150 watts from whatever connectors the card has, without discrimination. If you look in that list, a 970 is listed as 180w at peak power consumption and probably the SSC or whatever that is uses (overclocked version) slightly more, let's round it to 200 watts. Of course, values may be slightly higher if you overclock or get some factory overclocked card There's a thread on another forum where people have collected information (from various reviews, benchmarks etc) about the maximum power a video card uses at idle and at load, so you can get an idea about what power supply to use. So using a molex to pci-e 6pin adapter to give the video card an extra 20-30 watts (1-2A) when a single molex connector can carry up to 5A wouldn't be a big deal. noobs will say "oh it has extra power connector so it must be fast", "oh it says gaming on it so it must be good" Some video cards have a 6pin connector or 8 pin connector simply to make the card more attractive. Some video cards have an extra 6 pin connector just to add some room in case user wants to overclock the card (in which case the total power consumption may go over the slot's 65w limitation) Some video cards have total power consumption very close to 65 watts (the 12v limit for powering the card from slot, there's 10w more on 3.3v but nobody cares about that) so they add a pci-e 6 pin connector and balance the power to make it easy on motherboards, so they take 30-40w from slot and 30-40w from pci-e connector. People also don't seem to understand that just because a video card has one of those pci-e 6pin or 8 pin connectors, it doesn't mean that it would consume always 75 watts or 150 watts from that connector. It's obvious they limit these two models to 2 pci-e connectors so they won't cannibalize their other series, for example the TX 650M has 4 pci-e connectors : The Corsair CX 550 and CX 650 can output close to 550w on 12v and 650w yet they still only have 2 pci-e connectors : for example Corsair with their value series, they sold 420w models with one pci-e 6pin and sold 500w or 550w models with 2 x pci-e 6+2pin or something like that.įor example Corsair CX 450 has 448 watts on 12v but only one pci-e connector : Some manufacturers limit the number of connectors to push people into buying higher wattage models (and spend a few dollars more). Such systems don't need 6pin or 8 pin connectors so the company placing the order tries to save a dollar on wires and connectors by not including those pci-e connectors. That Seasonic 350w OEM power supply was probably made for a company like HP or Lenovo which used it in a system equipped with a motherboard that had integrated graphics and no pci-e x16 slots, or just one pci-e slot, or it's was a SLIM style desktop which can only host half-height pci-e cards. Obviously we're not talking about high quality power supplies here. So you're telling me that you bought the wrong PSU because it didn't come with a 6 pin?Īnyway, a card that requires a 6 and 8 pin usually uses several hundred watts, so using a 400W chinese power supply to power that would be a horrible idea. so maybe this could still become a problem if the GPU is a real gas guzzler. I used one of these 2x molex to 1x 6 pin in my system and it was just fine. so having a 6 pin or not isn't really a relieable indicator if the psu is powerful or not. That seasonic psu says 350W on the sticker and has no 6 pin but i have seen 300w or even 250w units that had a 6 pin. so lack of quality should not have been the reason why there is no 6pin. Seasonic has a reputation for producing good quality psus AFAIK. I bought a seasonic oem psu (one of the ugly grey ones) wich did not have 6 pin connectors.
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