Fan splitter questions

[Watashi]

Have you guys ever faced issues of losing RPMs in fans due to bad ban splitters! 
https://www.newegg.com/Product/Product.aspx?Item=N82E16812311001&ignorebbr=1&nm_mc=KNC-GoogleAdwords-PC&cm_mmc=KNC-GoogleAdwords-PC-_-pla-_-Cables+-+Internal+Power+Cables-_-N82E16812311001&gclid=Cj0KEQjwxPbHBRCdxJLF3qen3dYBEiQAMRyxS_40jMOPdEXjo_xvCVm7ZYo6nDC4-sDDPZFqEV6igwoaAqiK8P8HAQ&gclsrc=aw.ds

It seems to me like these guys would be able to deliver 100 percent of the power my Noctua 140mm fans, what do you think?

[WoodenMarker]

Whether enough power can be delivered will depend on the header you're powering the fans from and not the splitter.

If your header can't deliver enough power, the fans may slow down.

[LogicalDrm]

And behind massive link we have powered splitter. Yes, that will be delivering full power to all fans, no matter what fans or how many. What was the previous splitter, mobo and fans?

[Watashi]

12 hours ago, LoGiCalDrm said:

And behind massive link we have powered splitter. Yes, that will be delivering full power to all fans, no matter what fans or how many. What was the previous splitter, mobo and fans?

The splitters were molex to 3 pins, and the fans I was using which are Noctua 140mm case fans, have a 4pin connector, so I had to "mod" the splitters so the fans would fit.

[Watashi]

18 hours ago, WoodenMarker said:

Whether enough power can be delivered will depend on the header you're powering the fans from and not the splitter.

If your header can't deliver enough power, the fans may slow down.

Interesting, so using a molex, and a mobo header will be just fine for this?

[LogicalDrm]

27 minutes ago, Doomerson said:

The splitters were molex to 3 pins, and the fans I was using which are Noctua 140mm case fans, have a 4pin connector, so I had to "mod" the splitters so the fans would fit.

Molex shouldn't have any issues running 4+ fans. It delivers same amount of power (to my knowledge) that SATA does (which is power connector of splitter you posted). Only if you'd cut 12V wire from molex, then you would only run fans at 7V. Were the fans connected to mobo at all? I have a hunch that that might have been one of those splitters where you either use molex or mobo as power and that might have messed it. Its either or.

[mariushm]

A molex connector can offer up to 5-8A of current, so 12v x 5A = 60 watts of power. A single fan typically uses about 0.15a to 0.35a of current when it runs, the most "angry" fans use up to 0.5A but for a few seconds when they start spinning, fans typically use up to 1-2A.

 

Connectors on the motherboard are usually designed to support up to around 2A of current, so it's safe to plug up to 2-3 fans in general to a motherboard header.

On molex connectors you can obviously connect more than 2-3 fans.

 

@LogicalDrm SATA power connectors are rated for less current than molex connectors. It's about 1.5A per contact, and there's 3 contacts for each voltage rail, so you have 3 x 1.5A = 4.5A (pretty much maximum) for one sata connector for each voltage.

 

[Watashi]

11 hours ago, LoGiCalDrm said:

Molex shouldn't have any issues running 4+ fans. It delivers same amount of power (to my knowledge) that SATA does (which is power connector of splitter you posted). Only if you'd cut 12V wire from molex, then you would only run fans at 7V. Were the fans connected to mobo at all? I have a hunch that that might have been one of those splitters where you either use molex or mobo as power and that might have messed it. Its either or.

I only used molex, I think one of the fans are plugged into the mainboard however

[LogicalDrm]

28 minutes ago, Doomerson said:

I only used molex, I think one of the fans are plugged into the mainboard however

OK. How could you tell if fans were running slower than they should? Molex doesn't report rpm to mobo. So only fan(s) connected directly to mobo would even show rpm. It could be that fan connected to mobo has been running with some preset fan curve.

[WoodenMarker]

10 hours ago, Doomerson said:

Interesting, so using a molex, and a mobo header will be just fine for this?

Yes, it gets the pwm signal from the motherboard and power from the psu.

[Watashi]

21 hours ago, WoodenMarker said:

Yes, it gets the pwm signal from the motherboard and power from the psu.

ohhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh