2 x molex to 6 pin?

shojj · Nov 22, 2013

I have a EvoStream OCZ720EVOSLI 720W PSU:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817341005

I understand it is ideal to buy a new power supply.
However this power supply is meant to be able to support SLI/CrossFire, however only has 2x6 Pin PCIe.

I had a GTX 275 GPU, which needed 2x6 pin so I was fine, however now I bought a GTX 275 which requires a 8 pin + 6 pin, i don't have an 8 pin, only 2x6. Even though it's not ideal, could I use 2x6 pin to 8 pin (for the 8 pin power), and a 2xmolex to 6 pin (for the 6 pin power).

My PSU has 4 12V rails @ 16 Amps each, is that enough?

Could someone please let me know if my powersupply can handle this.
Thanks in advance.

My Specs (excluding the GPU and PSU stated above):
i7 2600k
16GB corsair vengence 1600mhz RAM
MSI Z77A-G45 MOBO

KeeperFiM · Nov 22, 2013

shojj :

While it will work, I think (and I'm not really sure about this) that molex-to-pcie power delivery is less stable than a regular pcie coming from your PSU

shojj · Nov 22, 2013

KeeperFiM :

shojj :

While it will work, I think (and I'm not really sure about this) that molex-to-pcie power delivery is less stable than a regular pcie coming from your PSU

Yes ofc it won't be as stable but i read there are some psu which can handle it just fine, i wanted to be 100% sure mine is among them ^^
thank you for your answer though it is much appreciated

Tibbs01 · Nov 22, 2013

It appears your PS has 4 +12v rails so you want to make sure you aren't connecting both molex plugs drawing from the same rail.

coozie7 · Nov 22, 2013

Neatest solution: http://www.newegg.com/Product/Product.aspx?Item=N82E16812706013
Safer and more stable than messing around with Molex plugs.

shojj · Nov 22, 2013

coozie7 :

Thanks for the reply but I han't heard good things about that adapter :S
i mean 6 pin pulls 75W and 8 pin pulls 150w, so that can cause a problem. Thanks anyway

shojj · Nov 22, 2013

Tibbs01 :

Do you mind explaingin further? How can i be sure the molex aren't connected to the same rail? By the way it's a modular PSU if that makes any difference.
Link to PSU specs: http://www.newegg.com/Product/Product.aspx?Item=N82E16817341005

coozie7 · Nov 22, 2013

Those 4 pin Molex plugs are intended to run HDDs and other low power peripherals so deliver their power through a single 12v line while PCI-E usually uses three, the only difference between 6 and 8 pin connectors is the two extra ground lines: http://www.playtool.com/pages/psuconnectors/connectors.html.
The actual power draw will depend on the component the lead is attached to and how loaded it is, just because an 8 pin can DELIVER 150 Watts does not mean the card will draw that much through it.

shojj · Nov 22, 2013

coozie7 :

Im kind of cxonfused now :\
if the only difference is two additional groundings then why is the 8 pin capable of pulling twice the wattage of a 6 pin?

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2 x molex to 6 pin?

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