Would a molex to PCIe adapter work for me?

Cornstalker · Jan 30, 2014

I am putting a PC together for a friend, and the case integrated PSU does not have a PCIe adapter. I am wondering whether a duel molex to PCIe will work for him.

Case: http://pcpartpicker.com/part/sentey-case-cs11399
GPU: http://www.newegg.com/Product/Product.aspx?Item=N82E16814130625

I also checked the estimated wattage for all of the parts and it was around the 210w range, is that cutting it too close?

Thanks in advanced.

giantbucket · Jan 30, 2014

it would work if the power supply doesn't die. meaning, the molex-to-pcie is fine for that power level, but the PSU might get overwhelmed and burst into flame. probably cutting it REAL close, or even going too far.

MauveCloud · Jan 30, 2014

Several issues here:
1. a molex to pci-e adapter cable is a bit risky even if you have enough molex connectors.
2. psus that come with cases tend to be inferior quality.
3. according to http://forum-en.msi.com/faq/article/power-requirements-for-graphics-cards a gtx 550ti calls for 24 amps on the +12V rail and a 400W psu. Even if you don't believe the 400W, 24 amps * 12 volts = 288 watts.

What psu calculator did you use to get that 210w number?

Cornstalker · Jan 30, 2014

I used PC part picker, and I have heard that the recommended wattage is much much higher than the actual needed amount. But if It does not work, do you have any suggestions on super cheap PSUs? It's only a few bucks for an adapter, is it worth the try?

MauveCloud · Jan 30, 2014

My suggestion is: don't get a super-cheap psu. It may seem like a bargain, but are you willing to gamble the lives of the rest of the components in your computer on it?

The SeaSonic S12II 430B should be good for a gtx 550 ti system, presuming you don't have other extra-power-hungry components like a 10k rpm drive or an overclocked cpu:
http://pcpartpicker.com/part/seasonic-power-supply-s12ii430b

As far as psu calculators go, I'd trust this one more than the pcpartpicker estimated wattage:
http://www.extreme.outervision.com/psucalculatorlite.jsp

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Would a molex to PCIe adapter work for me?

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