Need 2 6pin pcie connections for gpu Radeon HD6870

I just got my gpu and it needs 2 six pin pcie connections and my psu only has one. I was going to use a y adapter but I believe it is not safe. Instead of buying a whole new psu is it safe to use a 2 four pin molex to 1 six pin pcie. My psu calculates to 680 watts but is advertised at 650w and the gpu requires just 500w. Any way the issue I am facing is that I am not sure if I should get a 1 four pin molex to 6 pin pcie or would using a 2 four pin molex to 1 six pin pcie be better. I believe using the 2 four pin molex to 1 six pin pcie would be better to assure that the gpu is getting the sufficient power requirements. As long as I don't use both molexes from the same power strand. Please let me know if I am correct. Thank you
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  1. The 6850 doesn't use 500W. A system with a 6850 might need to be powered by a 500W PSU, but the card itself doesn't use that much. What "680W: PSU you do you have? You should be ok unless its total junk.
  2. ^+1, if you have a 680W PSU with only one PCI-e connector, that's not a good sign...
  3. LOL, I forgot to mention that. My 500W has 2. And probably more 12V power then his 680. Modern 650W units ship with four of them now.
  4. Can someone please let me know which is better or more safe. 2 four pin molex to 1 six pin pcie or 1 four pin molex to 1 six pin pcie. I do know that the gpu does not use 500watts. What I meant was a 500 watt psu is the minimum requirement for my Radeon HD6870. I do know that other psu's come with more than one 6 pin pcie connections. That is now what I need information about. And it's not a 6850 its a 6870. Can someone please give me a helpful answer. Please let me know which is better or more safe. 2 four pin molex to 1 six pin pcie or 1 four pin molex to 1 six pin pcie.
  5. I'm not sure what you are asking here.

    Do you want to use adapters on both of the 6870s PCIe plugs? Or use one adapter and use the PCIe cable on the PSU? I would use the PCIe plug you have and then one adapter.

    Or you might be asking if on the adapter if you need to use 2 molex plugs or if you can get away with one. I would use 2 plugs if this is what you are wondering.

    I would NOT use that junk 680W PSU. It reeks of junk and the 6870 could be more then it could handle.
  6. 4745454b said:
    I'm not sure what you are asking here..

    Ditto... ^ Some good suggestions though.
  7. Thanks for the help. Sorry I kind of confused you guys. I want to use 1 adapter that has 2 4pin molex. I figured it is better to have two molex to 1 six pin pcie. The one six pin pcie I have is connected directly to the gpu and the 2 4pin molex is my adapter for a second 6pin pcie. I made sure not to use the 2 four pin molex's from the same string from my psu making sure it gets the power it needs. thanks
  8. Run it if you want, but you need a new PSU.
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