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Does a single Molex provide enough power to 4x SATA power?

post #1 of 22
Thread Starter 
I am currently using this (Lian Li EX-36B1),

600

I have 4 HDDs and a SSD on the side and want to use this for a cleaner look,

462

Does a single Molex connector provide enough power to 4x SATA HDDs?
 
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post #2 of 22
yes.
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post #3 of 22
I believe this will work as its parallel wiring.
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post #4 of 22
Quote:
Originally Posted by kikkO View Post

I am currently using this (Lian Li EX-36B1),
600
I have 4 HDDs and a SSD on the side and want to use this for a cleaner look,
462
Does a single Molex connector provide enough power to 4x SATA HDDs?

Yes it will...

Also drives in the picture are IDE... Haha.. tongue.gif
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post #5 of 22
As long as the rail the molex is connected to as the juice then yes. If you have all sorts of other carp connected the same line then in might not but I can't think of any situation where you would have so much other stuff.
    
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post #6 of 22
Thread Starter 
I will be using a dedicated cable coming directly off my PSU (Seasonic X750) that splits into 2 molex. One of those molex will split into 4x SATA power.

What if I connected the other 4 HDDs using the second molex for a total of 8 SATA power HDDs, will that cable provide enough power then?

I found a article on Anandtech:
Quote:
How much you can put on a wire is about the same whether it is home wiring or pc wiring. You need to look at 2 things, power and length.
For power a typical hard drive uses .75A @ 5V, .5A @ 12v.
The rules for DC voltage allow for a wire length of 2ft using 18AWG wire for 4 drives at those ratings. That would be if all the power is going through just two wires. In a pc that is split though and that brings it to 8 drives on 18AWG wiring.

So with a wire gauge of 18 you can run 8 drives off one set of wires for up to 2ft . The site doesn't list the gauge of the wires for sale so you need to find that out. Wire gauge goes backwards, so 16 is bigger wire than 18. If it is 18 or lower then it is fine, above 18 and it would cause the voltage to drop.

Guess it boils down to what gauge wire Performance-PCs is using. I hoping they used a 16AWG wire.
 
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post #7 of 22
I wouldn't worry about the wire gauge so much. It has an effect but at thees lengths its not that bad. I took a look at the Seasonic X750 and it is a single rail model so no worries there. So you mostly just need to worry about the actual wattage of the PSU the 8 HDD's will draw about 50W on the 12V line and about 30W on the 5v line for a total of 80w. Now here it get a bit complicated if you where running crossfire or SLI as the 50W would be away from the power available for the CPU and graphics cards while the total 80W would be something that limits the complete system wattage. But as you are no where near the limits of PSU you should have noting to worry about.
    
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post #8 of 22
Thread Starter 
Thanks rep+ guys.
 
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post #9 of 22
well if you start to smell burning components then you know that it is a bad idea, but i do think you will be ok.
    
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post #10 of 22
I recall hearing years ago that the wattage limit for molex connectors was 35w? That's why they started adding PCIe connectors to videocards, which had a limit of 75w each?

As long as all the drives don't spin up at the same time, it should be fine. Most drives consume 6-8 watts, and that SSD is probably around 2-4 watts. At worst that's 24-32 watts. If you do 3 drives and an SSD on that cable, I doubt you'll have any issues. thumb.gif
Edited by Kramy - 4/30/12 at 3:45am
     
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None Onboard VIA 
CPUMotherboardGraphicsRAM
Barton XP-M 2400+ FJQ4C Asus A7N8X-E Deluxe 256MB BFG 7800GS OC 2x512MB Samsung PC3200 
Hard DriveOSMonitorKeyboard
Raptor 74GB/Seagate 120GB Windows 2000 Pro 60hz 17" CRT Brandless PS2 Keyboard 
PowerMouse
Antec Neo HE 550w Logitech G5 
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CPUMotherboardGraphicsRAM
FX-8350 @ 4.6ghz 1.425v Sabertooth 990FX Zotac GTX 1070 Amp! 32GB (4x8GB) Kingston Fury 1866mhz CL10 1T 1.5v 
Hard DriveHard DriveHard DriveHard Drive
Hitachi 2TB - HDS723020BLA64 Crucial M500 960GB - CT960M500SSD1 WD 4TB Black - WD4001FAEX WD 4TB Black - WD4001FAEX 
Hard DriveHard DriveHard DriveHard Drive
Seagate 2TB - ST2000DM001 WD 640GB Black - WD6401AALS Seagate 6TB - ST6000DM001 Micron M500 - MTFDDAK480MAV 
Optical DriveOptical DriveOptical DriveOptical Drive
Pioneer DVR-115DBK Samsung SH-S243D/BEBE LG GH22NS90 Lite-On EBAU108 External DVD 
CoolingCoolingCoolingOS
Noctua NH-D15 Fractal Design 140mm Fan - FD-FAN-140 Fractal Design 120mm Fan - FD-FAN-120 Windows 7 
OSMonitorMonitorKeyboard
Ubuntu 14.04 LTS Samsung 2343BWX 23" (2048x1152) BenQ GW2765HT 27" IPS LCD Monitor (2560x1440) Genius Keyboard KB-G235 PA 
PowerCaseMouseMouse Pad
Seasonic Platinum 1000w PSU - SS-1000XP Fractal Design Define R5 Steelseries Rival 6500 dcpi Mousepad + Desk 
AudioAudioOtherOther
Onboard Realtek® ALC 892 Cyber Acoustics CA-2992 2.0 Speakers Razer Krait 1600 DPI nGear G-C1601 Card Reader 
OtherOther
Pisen Card Reader Gigabyte M7 Thor 
CPUMotherboardGraphicsRAM
VIA Eden C7 1200mhz Jetway J7F4K1G2ES-LF VIA Onboard 512MB PC2-4200 
Hard DriveOptical DriveCoolingOS
A-Data FlashDrive None Fanless Linux 
MonitorKeyboardPowerCase
Headless None 65w Power Brick Antec ISK300-65 
MouseAudio
None Onboard VIA 
CPUMotherboardGraphicsRAM
Barton XP-M 2400+ FJQ4C Asus A7N8X-E Deluxe 256MB BFG 7800GS OC 2x512MB Samsung PC3200 
Hard DriveOSMonitorKeyboard
Raptor 74GB/Seagate 120GB Windows 2000 Pro 60hz 17" CRT Brandless PS2 Keyboard 
PowerMouse
Antec Neo HE 550w Logitech G5 
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