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Setting up a case with power supply for only HDD's. Is it possible


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#1 RoccoT

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Posted 12 June 2013 - 05:13 PM

Hi folks, I'm trying to figure out a solution that simple enough in theory has turned into something way more complicated.
I have a main desktop PC with a new internal RAID card. I've simply run out of space inside my computer for additional hard drives (i'd like to setup 8 drives in raid). What I was hoping was to build another case with just a power supply and run 2 SAS - 4 sata fan out cables from inside the main computer to the Raid case. Since the power supply needs to be attached to a motherboard to turn on, what would be the best option for this? I've seen posts where people are putting jumpers in the main motherboard cable. Or I was thinking of just installing an older motherboard and plugging into that so that when I turn on the computer it starts up the power to all the internal hard drives.

The ideal scenario would be no second motherboard, just the case, power supply and 8 drives. Have the power supply communicate somehow with the main computer and it would power on whenever the other PC powers up.

If you have any suggestions on this please let me know!

Cheers.

#2 FastMHz

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Posted 12 June 2013 - 07:39 PM

Easiest solution I can think of if you're not into busting out the soldering iron is this:

Have a second case with either an AT power supply that uses a physical switch to turn on and off, or an ATX supply with one of those $7 testers connected. Then plug both your main PC and the "expansion chassis" into a smart power strip so that the strip is controlled by the main PC. Both will power on and off in unison.

The motherboard cable pin shorting trick isn't a good idea for all power supplies, as power should be drawn on all lines (even 3.3v, which HDDs don't use) or damage can occur in some cases.

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#3 RoccoT

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Posted 13 June 2013 - 01:11 PM

I'm using this Corsair HX750 power supply which I know is overkill for just drives but I got a good deal on it:

My link


Right now its plugged into an old motherboard which has a cpu, fans everything still on there. I'm assuming since the power supply is getting a normal draw right now, the safest bet would be to leave it as is. Or does anyone know if these power supplies can be fine with just the pin hack and I can ditch all the extra stuff wasting power in the case?

#4 FastMHz

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Posted 13 June 2013 - 06:49 PM

Get one of these and call it a day.

Production: Vishera 8350/32gb RAM/Dual SSD/VelociRaptor/Radeon 7750
Gaming: Vishera 6350/16gb RAM/SSD/VelociRaptor/2x Radeon 7950 Crossfired
Retro: K6-2 550/256mb RAM/160gb HDD/CompactFlash/3DFX/ATI AIW Pro/SB16/DB50XG
http://www.fastmhz.com

#5 continuum

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Posted 21 June 2013 - 03:09 PM

What FastMHz said. Just hope the load resistor doesn't overheat.

Although the HX750 is independently regulated so you probably don't even need the load resistor, just short PS_ON to ground...

#6 Highroller54

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Posted 04 July 2013 - 06:56 PM

By the time you purchase all the stuff you need, you can buy these for less and have massive amounts of expansion. http://www.ebay.com/...984.m1423.l2649 and this if your raid card only has internal sas connections http://www.ebay.com/...984.m1423.l2649

But if you already have the stuff you need then it isn't needed. You dont have to have a CPU for the power supply and system to work. Just pickup a cheapy Pentium MOB without a cpu and start building..


Hi folks, I'm trying to figure out a solution that simple enough in theory has turned into something way more complicated.
I have a main desktop PC with a new internal RAID card. I've simply run out of space inside my computer for additional hard drives (i'd like to setup 8 drives in raid). What I was hoping was to build another case with just a power supply and run 2 SAS - 4 sata fan out cables from inside the main computer to the Raid case. Since the power supply needs to be attached to a motherboard to turn on, what would be the best option for this? I've seen posts where people are putting jumpers in the main motherboard cable. Or I was thinking of just installing an older motherboard and plugging into that so that when I turn on the computer it starts up the power to all the internal hard drives.

The ideal scenario would be no second motherboard, just the case, power supply and 8 drives. Have the power supply communicate somehow with the main computer and it would power on whenever the other PC powers up.

If you have any suggestions on this please let me know!

Cheers.





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