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Sleeving My Server should i install ferrite core's

post #1 of 3
Thread Starter 
I have a desktop that ive slowly been converting into a server. SATA raid controller will be here this week.. : ) But on to my question...

I'm looking to sleeve the innards of my server, please don't ask why, i can't give a logical reason other then i wanted to to it to my desktop while it was still my daily machine but never had the chance... So what im looking at now is the fact that i see some high end PSU's have EMI filters or ferrite core on cables. Would it hurt anything if i were to install one of these on each once of my groups of cables running to my PSU? I'm thinking i can get then for $.30 each and i would only need 11 for all my main power cables. I have a modular PSU so most of it will be easy and i think i'll try to hide the others inside the PSU for the attached cables.

I tend to over due thing and i realize that some people are removing their ferrite core's from their PSU's, i'm just thinking if it would help ANYTHING it would be worth it as i plan to keep this server for a long time, and just slowly upgrade the HDD's if need be until it's to slow for my needs.
Edited by Tempest_Inc - 2/8/11 at 11:17pm
 
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MacBook Pro 6.1
(16 items)
 
Server
(19 items)
 
CPUMotherboardGraphicsRAM
Core i7 Q720 Asus ATI Mobility Radeon HD 5870 1GB DDR5 12 GB DDR3 
Hard DriveOSMonitorKeyboard
Seagate Momentus XT 500GB 7200RPM & Seagate 750... Windows 7 Ultimate x64 17.3" LED LCD Factory 
PowerCaseMouseMouse Pad
Factory Factory Logitech G9X Mine 
CPUMotherboardGraphicsGraphics
Intel Core i5 MacBook Pro 6.1 17" Intel HD Graphics NVIDIA GeForce GT 330M 
RAMHard DriveOptical DriveCooling
4 GB DDR3 1067 MHz Hitachi HTS545050B9SA02 HL-DT-ST DVDRW GS23N Factory 
OSMonitorKeyboardPower
Mac OS X 10.6.8 17" LED Factory Factory 
CaseMouseMouse PadAudio
Factory Factory None Factory 
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q9550 Abit IP35 Pro PNY VCQ290NVS-PCIEX16-PB Quadro NVS 290 256MB 64-b G.Skill F2-8000CL5D-4GBPQ 
Hard DriveHard DriveHard DriveHard Drive
Dell Perc5/i Samsung HD204UI Seagate Constellation ES SAS Drive Model: ST310... Hitachi Deskstar 
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Western Digital WD1002FAEX Black Western Digital Black 2 x ASUS DRW-2014L1T Corsair H50 
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Windows Server 2008 R2 Standard x64 ASUS VK222U Black 22" 2ms Logitech G15 (Original) - U.S. Dvorak Layout Enermax INFINITI EIN720AWT 720w 
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LIAN LI V SERIES PC-V2100A Silver Aluminum ATX ... Logitech G9x Steven's Computer Service 
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post #2 of 3
Since your question comes close to what I do for a living I had some doubts these ferrite chokes may have some use in a PSU, but I was (partially) wrong. Here's a wiki:
http://en.wikipedia.org/wiki/Ferrite_bead

So in your case what these chokes would do is to filter high frequency PSU ripple. This is good, before you see that what it actually does is send those high frequency parasitic currents back to the PSU - and this may be bad because the PSU aren't meant to withstand this effect. Besides, too small of a choke may heat up if it has too much ripple to filter.
Moreover a coil stores energy, and when you power down it would have to discharge into something - cables and/or PSU, whichever has the lowest impedance. This again could cause issues if the chokes stores enough energy, they could increase material stress.

In my opinion this should be a solution only if you have high PSU ripple (typical for cheapo's).

Bottom line: if you choose your chokes so that their stored energy doesn't endanger PC's components, it may bring an improvement if the voltage rails have a lot of ripple (note that PC components are made to withstand some amount of ripple anyway); if you overshoot with too powerful chokes you may end up shortening the life or the PSU and/or motherboard as the choke must discharge upon power down.

cheers
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Centurion
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by dragosmp View Post
Since your question comes close to what I do for a living I had some doubts these ferrite chokes may have some use in a PSU, but I was (partially) wrong. Here's a wiki:
http://en.wikipedia.org/wiki/Ferrite_bead

So in your case what these chokes would do is to filter high frequency PSU ripple. This is good, before you see that what it actually does is send those high frequency parasitic currents back to the PSU - and this may be bad because the PSU aren't meant to withstand this effect. Besides, too small of a choke may heat up if it has too much ripple to filter.
Moreover a coil stores energy, and when you power down it would have to discharge into something - cables and/or PSU, whichever has the lowest impedance. This again could cause issues if the chokes stores enough energy, they could increase material stress.

In my opinion this should be a solution only if you have high PSU ripple (typical for cheapo's).

Bottom line: if you choose your chokes so that their stored energy doesn't endanger PC's components, it may bring an improvement if the voltage rails have a lot of ripple (note that PC components are made to withstand some amount of ripple anyway); if you overshoot with too powerful chokes you may end up shortening the life or the PSU and/or motherboard as the choke must discharge upon power down.

cheers
I guess i'll skip it then seem that if everything has worked for the past 3-4 years why fix it now. I was just thinking that in my environment it may have some benefit at possibly extending the life of my components, but if i have the possibility to miscalculate then i don't see a reason to mess with it. i payed a bit for this PSU back when I purchased it i think pushing $200 or more so i don't believe it would be in the el cheap-o category...

Thanks a ton for the assistance.
 
MacBook Pro 6.1
(16 items)
 
Server
(19 items)
 
CPUMotherboardGraphicsRAM
Core i7 Q720 Asus ATI Mobility Radeon HD 5870 1GB DDR5 12 GB DDR3 
Hard DriveOSMonitorKeyboard
Seagate Momentus XT 500GB 7200RPM & Seagate 750... Windows 7 Ultimate x64 17.3" LED LCD Factory 
PowerCaseMouseMouse Pad
Factory Factory Logitech G9X Mine 
CPUMotherboardGraphicsGraphics
Intel Core i5 MacBook Pro 6.1 17" Intel HD Graphics NVIDIA GeForce GT 330M 
RAMHard DriveOptical DriveCooling
4 GB DDR3 1067 MHz Hitachi HTS545050B9SA02 HL-DT-ST DVDRW GS23N Factory 
OSMonitorKeyboardPower
Mac OS X 10.6.8 17" LED Factory Factory 
CaseMouseMouse PadAudio
Factory Factory None Factory 
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q9550 Abit IP35 Pro PNY VCQ290NVS-PCIEX16-PB Quadro NVS 290 256MB 64-b G.Skill F2-8000CL5D-4GBPQ 
Hard DriveHard DriveHard DriveHard Drive
Dell Perc5/i Samsung HD204UI Seagate Constellation ES SAS Drive Model: ST310... Hitachi Deskstar 
Hard DriveHard DriveOptical DriveCooling
Western Digital WD1002FAEX Black Western Digital Black 2 x ASUS DRW-2014L1T Corsair H50 
OSMonitorKeyboardPower
Windows Server 2008 R2 Standard x64 ASUS VK222U Black 22" 2ms Logitech G15 (Original) - U.S. Dvorak Layout Enermax INFINITI EIN720AWT 720w 
CaseMouseMouse Pad
LIAN LI V SERIES PC-V2100A Silver Aluminum ATX ... Logitech G9x Steven's Computer Service 
  hide details  
Reply
 
MacBook Pro 6.1
(16 items)
 
Server
(19 items)
 
CPUMotherboardGraphicsRAM
Core i7 Q720 Asus ATI Mobility Radeon HD 5870 1GB DDR5 12 GB DDR3 
Hard DriveOSMonitorKeyboard
Seagate Momentus XT 500GB 7200RPM & Seagate 750... Windows 7 Ultimate x64 17.3" LED LCD Factory 
PowerCaseMouseMouse Pad
Factory Factory Logitech G9X Mine 
CPUMotherboardGraphicsGraphics
Intel Core i5 MacBook Pro 6.1 17" Intel HD Graphics NVIDIA GeForce GT 330M 
RAMHard DriveOptical DriveCooling
4 GB DDR3 1067 MHz Hitachi HTS545050B9SA02 HL-DT-ST DVDRW GS23N Factory 
OSMonitorKeyboardPower
Mac OS X 10.6.8 17" LED Factory Factory 
CaseMouseMouse PadAudio
Factory Factory None Factory 
CPUMotherboardGraphicsRAM
Intel Core 2 Quad Q9550 Abit IP35 Pro PNY VCQ290NVS-PCIEX16-PB Quadro NVS 290 256MB 64-b G.Skill F2-8000CL5D-4GBPQ 
Hard DriveHard DriveHard DriveHard Drive
Dell Perc5/i Samsung HD204UI Seagate Constellation ES SAS Drive Model: ST310... Hitachi Deskstar 
Hard DriveHard DriveOptical DriveCooling
Western Digital WD1002FAEX Black Western Digital Black 2 x ASUS DRW-2014L1T Corsair H50 
OSMonitorKeyboardPower
Windows Server 2008 R2 Standard x64 ASUS VK222U Black 22" 2ms Logitech G15 (Original) - U.S. Dvorak Layout Enermax INFINITI EIN720AWT 720w 
CaseMouseMouse Pad
LIAN LI V SERIES PC-V2100A Silver Aluminum ATX ... Logitech G9x Steven's Computer Service 
  hide details  
Reply
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