650ti Boost 2x4pin molex to 6pin pci-e

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HunterW

HunterW

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Nov 11, 2013
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I got a 650ti Boost today, but my power supply doesn't have a 6 pin pci-e power connector. I was wondering if a 2x 4 pin molex to 6 pin pci-e power cable would work. The power supply is 500 watts, so I know have enough power, what I don't know is if the cable will be okay to use. I don't have very much experience in this area. Better yet, would I be okay using a single 4pin molex to 6 pin pci-e?

Here's the cable: http://www.amazon.com/Micro-SATA-Cables-PCI-E-Molex/dp/B005YCKUYU/ref=sr_1_11?ie=UTF8&qid=1408074088&sr=8-11&keywords=4pin+molex+to+6pin+pci-e
 
Solution
nukemaster
The 2 x 4 pin LP4 to PCI-E is best.

Please check the rating on the power supply older 500 watt power supplies have less power on 12 volt rail than newer ones.

Older systems did not make as much use of 12 volts, but as parts started to use more power 12 volts was chosen because you can get more wattage over smaller cables at 12 volts than 5 or 3.3

Math time :)

Lets say you need 120 watts(for simplicity we will not talk about losses because switching regulators are very efficient).

wattage / voltage = current(amps)

@ 12 volts 120 watts is 10 amps.
@ 5 volts 120 watts is 24 amps.
@ 3.3 volts 120 watts is about 36.4 amps.

You would need beefed up cables for the lower voltages(this is why some of the cables in a car are so large...
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nukemaster

nukemaster

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Nov 23, 2004
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The 2 x 4 pin LP4 to PCI-E is best.

Please check the rating on the power supply older 500 watt power supplies have less power on 12 volt rail than newer ones.

Older systems did not make as much use of 12 volts, but as parts started to use more power 12 volts was chosen because you can get more wattage over smaller cables at 12 volts than 5 or 3.3

Math time :)

Lets say you need 120 watts(for simplicity we will not talk about losses because switching regulators are very efficient).

wattage / voltage = current(amps)

@ 12 volts 120 watts is 10 amps.
@ 5 volts 120 watts is 24 amps.
@ 3.3 volts 120 watts is about 36.4 amps.

You would need beefed up cables for the lower voltages(this is why some of the cables in a car are so large compared to the cables in your house.).

For the fun of it, @ 120 volts 120 watts is just 1 amp.
 
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Solution
HunterW

HunterW

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Nov 11, 2013
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10,660


It is indeed 12v. Thanks for the answer.

 
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HunterW

HunterW

Honorable
Nov 11, 2013
53
0
10,660
UkrlTBk.jpg
 
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nukemaster

nukemaster

Titan
Nov 23, 2004
19,626
6
74,965
I would like to not be the one to say this, but that is one of those older power supply designs.

The 500 watt model has 19 amps @ 12 volts. that is 228 watts. This is about what you would find in a newer design for 250-300 watts.

The newer designs do not use independent rails any more so you now would have 1 very large 12 volt rail provide to the lower rails. The +5 SB would still be separate, but the 5 and 3.3 are off the 12 volt rail with DC-DC converters.

Here is a newer 300 watt unit that you can see has 22 amps @ 12 volts(They have a seasonic unit with 24 amps). And even that would be too low for the 650 ti boost.
2yttp1j.jpg
 
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