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Question about powering case fans and disk drives

Last response: in Components
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July 6, 2011 11:31:55 PM

I am looking to build my first computer and i had a few questions:

Do I use the 4 pin plugs from the power supply to power the case fans, and do i also use these plugs to power the disk drives?

How would this work if I use a case fan controller (installed in a 5.25 port)?

and any other useful information on powering case fans and disk drives, like how many cables and what type would i be looking for in a PSU, what wattage would be recommended (specs are below), and any other useful tips and info.



ASRock 890GX PRO3 AM3 AMD 890GX SATA 6Gb/s USB 3.0 HDMI ATX AMD Motherboard

Scythe SY1225SL12SH 120mm "Slipstream" Case Fan (x3 or possibly x5)

XFX HD-679X-ZDFC Radeon HD 6790 1GB 256-bit GDDR5 PCI Express 2.1 x16 HDCP Ready CrossFireX Support Video Card (possibly Crossfiring in the future with the same card)

AMD Phenom II X4 955 Black Edition Deneb 3.2GHz Socket AM3 125W Quad-Core Processor HDZ955FBGMBOX (not OCed but possibly up to 3.4 if the need arises)

Patriot G Series ‘Sector 5’ Edition 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10666) Desktop Memory Model PGV38G1333ELK (Eventually 16GB)

LITE-ON DVD Burner - Bulk Black SATA Model iHAS124-04 - OEM (probably 2 of these, and maybe a bluray burner in the future)

NZXT Sentry-2 5.25" Touch Screen fan controller

Best solution

a c 286 ) Power supply
July 6, 2011 11:38:37 PM

Most drives these days are SATA so they are powered off of a slightly different power cable, the 4 pin power cables were for the older IDE drives, the same connector is also used to power case fans.


You can plug your case fans into either your PSU, your motherboard, or your fan controller but not all three. The fan controller will have a power connection from the PSU it then feeds the rest of the fans from itself, so even if you had an IDE DVD drive or something, the power on the molex connectors isnt affected, only the power getting to the fans is.
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July 6, 2011 11:41:40 PM

how big of a power supply might i need with the above build, and how many of what kind of plugs would the supply need (i.e. 5 -4pins, 1 6+2, etc etc)
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July 6, 2011 11:47:10 PM

HEC Blitz Black Steel Edition ATX Mid Tower Computer Chassis Gaming Case w/ Front Blue LED 120mm Fan & Top 120mm Fan

is my case
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a c 286 ) Power supply
July 6, 2011 11:48:47 PM

With a 6790 and a 955, a good 500W unit would be plenty, but 650W units are only slightly more and you wont have to worry about upgrading it in the future. If it were me i would go for this unit from XFX, its a nice, well build, modular unit with enough power and connectors that it will support any upgrade you want to do to that system and will still be good for a rebuild in a couple of years.

http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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July 6, 2011 11:50:51 PM

it would be sufficient to crossfire as well?
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a c 286 ) Power supply
July 7, 2011 12:00:15 AM

Yup, thats part of the advantage to getting a 650W now, if you ever want to CF down the line you dont need a new unit. I only got a 500W in my system and havent been able to justify getting a 650W unit and another 4850 for CF.
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July 7, 2011 1:40:46 AM

Best answer selected by EZ Ki11.
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a b ) Power supply
July 25, 2011 9:12:02 PM

This topic has been closed by Mousemonkey
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