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External pcie power options?

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September 13, 2011 6:28:31 PM

i am wanting a sli setup since i have an op to get dual gtx460s for dirt cheap but need a total of 4 ridiculous power rails to power that setup. my psu only has 2. now are there any other options i have that doesnt require me to pull out my current psu? some sort of external plug in pcie adapter or something? i dont think running pcie power through molex or sata adapters would be a good thing...

More about : external pcie power options

September 13, 2011 8:30:36 PM

What power supply do you have?
Which connectors are currently free/unused?
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September 14, 2011 12:13:47 AM

i have a RPR650W coolermaster
http://www.coolermaster.com/product.php?product_id=2551
i ported over my older ide 5.25 optical drives from my comp so they are still using one set of molex connectors. i have a bunch of sata power connectors left and maybe one dual set of molex. there is another weird 8 pinplug, something like the 125W power plug to the mobo/cpu but with two more pins, dunno what that is.


now that 5.25 drive bay power supply is just what im looking for!!! need to look around more. these look like they only have 2 rails each. need 4. dangit nvidia. unless i can power one card from my current psu and power the other card via one of these supplementary psus.
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September 14, 2011 12:47:02 AM

Well there are adapters that turn two 4-pin molex into one 6-pin PCIe, but you would need 4 free molex connectors, and from what you said you only have 2 free at the moment.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

What are you using the other 3 molex for, an IDE optical drive? You could use a SATA to molex adapter for your optical drive, and that would free up the molex connectors to use for the PCIe adapter.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

So, if you bought 2 molex to PCIe adapters and 1 SATA to molex adapter it would cost you about $20 ($21 including shipping). Cheaper than another power supply, but still twenty bucks. Maybe someone else can provide even cheaper alternative. Good luck.
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September 14, 2011 2:16:30 AM

jsanthara said:
Well there are adapters that turn two 4-pin molex into one 6-pin PCIe, but you would need 4 free molex connectors, and from what you said you only have 2 free at the moment.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

What are you using the other 3 molex for, an IDE optical drive? You could use a SATA to molex adapter for your optical drive, and that would free up the molex connectors to use for the PCIe adapter.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

So, if you bought 2 molex to PCIe adapters and 1 SATA to molex adapter it would cost you about $20 ($21 including shipping). Cheaper than another power supply, but still twenty bucks. Maybe someone else can provide even cheaper alternative. Good luck.


would using adapters like this be a safe alternative? i dont want to fry anything. ebay has them for dirt dirt cheap. i wouldnt buy from us retailers.
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September 14, 2011 2:30:40 AM

Honestly I have never used a molex to PCIe adapter before, so I couldn't speak to the "safety" of it. I'm really not sure what safety issues you're concerned with, but I have used SATA to molex, molex to SATA, and various other adapters and extenders before and have never had an issue.

If you're still concerned then you might want to wait and see if someone on the forum has had some experience using molex to PCIe adapters.
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September 14, 2011 3:04:29 AM

yea i dont mind using adapters for sata -> molex since those devices are usually pretty low power draw. but with some that sucks power like a GPU, thats a different story.

but even video card companies bundle their cards with molex to pcie adapters, so it must be ok...this is only an assumption
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September 14, 2011 3:12:17 AM

I found another molex to PCIe, except this one will turn 2 molex into 2 PCIe instead of 1. That would mean you wouldn't need to buy the SATA to molex adapter, only the molex to PCIe adapter (you said you had 2 free molex connectors, right?)

http://www.newegg.com/Product/Product.aspx?Item=N82E168...

Both the one I posted before and this one both got good reviews. According to them it seems to power their video cards with no problems. Like I said before you can wait and see what others weigh in, but if it were me and I was on a tight budget, the positive reviews would be enough.

The main thing to be concerned with is if your PSU has the wattage to run dual video cards in the first place. If your sure the PSU can handle the task then I wouldn't be concerned with the adapters.
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September 14, 2011 3:43:32 AM

hmm 2 molex to 2 pcie, i think given the two options i think id be more comfy with the first adapter with 2 molex to 1 pcie and use the sata power to adapter to molex.
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September 14, 2011 4:12:18 AM

Then you're purchasing 3 adapters instead of 1, but whatever makes you comfortable.
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September 14, 2011 4:33:27 AM

less power draw coming out of each molex rail. i think thats better. i guess theres no other choice really. those gpu psus are pretty pricey. unless i go to ati (no crossfire mobo). dangit nvidia. i should have followed my gut instinct to always support the underdog. in this case it would have been ati.
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