Question about 3pin to molex adapters and power

Sacrifice · 28 May 2017 at 15:07

I'm trying to power two h55 pumps (and a case fan) using a molex to 4x3 pin splitter.

Will each of the 3 pins be outputting the maximum power possible to the h55 pumps?

Or can anyone point me to some adapters that I can buy that will output the full voltage from molex to 3 pins?

Thanks!

HoneyBadger · 28 May 2017 at 19:38

I would expect them to output the max, why would you think they wouldn't? (Genuine question)

Sacrifice · 28 May 2017 at 22:54

Good question. I have two gpu's with h55's. The top one was always between 85-94 in Witcher 3/some other games, the bottom one at 60-75C. Today I swapped them around, the (new) top one was at 80C, the bottom one still went to 94 and started throttling.

So I'm not sure whether it's the pumps or what, because I reseated/reapplied thermal paste. And I'm not sure why the (now) bottom card is so much hotter than the top.

Disco_P · 29 May 2017 at 16:37

Did you swap the coolers or the cards?

One of the h55 could be faulty.

Sacrifice · 29 May 2017 at 16:49

Disco_P said:
Did you swap the coolers or the cards?

One of the h55 could be faulty.

I think I'm going to swap the pumps tomorrow to see. I had swapped the cards

Tealc · 31 May 2017 at 20:12

Not all Molex to 3 pins are created equal. Some will have different wiring so that instead of 12v it'll only provide 7v or 5v. Others may have a resistor designed to drop voltage.

The one in the image for example outputs 12v on the yellow side and 5v on the red side, if that makes sense. If all 3 pins are coming from the same side of the connector then it's not the converter.