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SSC Jumper Mode?

post #1 of 7
Thread Starter 
I've seen several SATA WD hard drive have this kind of jumper mode (1-2), so what is SSC and is there any different if it's enable or not?

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post #2 of 7
Spread spectrum is the Protocol in which EMI is reduced. EMI is Electro Magnetic Interference . Having SSC enabled will impact on your performance and i would reccomend you have it disabled if you can.
post #3 of 7
Heh, I just got done reading an explanation of this in Maximum PC in the ask the doctor section in August 2006. Heres a summary.

Quote:
SSC spread-sprectrum clocking lowers peak spectral energy-thus EMI by modulating the frequency of the clock signal by a small amount, usually .1-.5 percent.

During a third party lab testing they said that EMI emissions didnt really vary with it on or off. it affected performance with it on becuase the intentional modulation of the clock frequency-however minor-eats away at the drives valuable jitter-tolerance margin.
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X25-M 80GB, 1TB WD Black Windows 7 Ultimate 64-bit Asus VW246H Saitek Eclipse 
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post #4 of 7
Yes nice find..thats pretty much what SSC will do when enabled even though the performance decrease is small we want all the performance we can get so i would disable it.
post #5 of 7
Thread Starter 
OK, thanks ENTERPRISE1701 and PirateRule.

Does this also apply to AGP graphic card? I see an option in BIOS say enable spread spectrum, so I would disable it to get better perf?
Of A Down Redux
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CPUMotherboardGraphicsRAM
E4300 @ 3.0Ghz GIGABYTE GA-P35-DS3L VisionTek HD4850 Corsair XMS2 2GB DDR2 
Hard DriveOptical DriveOSMonitor
WD320 + WD400 HP DVD burner Windows XP PRO Samsung 226BW 22" 
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Hard DriveOptical DriveOSMonitor
WD320 + WD400 HP DVD burner Windows XP PRO Samsung 226BW 22" 
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post #6 of 7
Quote:
Originally Posted by shajbot
OK, thanks ENTERPRISE1701 and PirateRule.

Does this also apply to AGP graphic card? I see an option in BIOS say enable spread spectrum, so I would disable it to get better perf?
Yeah it should be disabled if youre overclocking.
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 860 Asus Maximus III Formula ASUS 5870 8GB G.Skill Ripjaws DDR3 2000 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 1TB WD Black Windows 7 Ultimate 64-bit Asus VW246H Saitek Eclipse 
PowerCaseMouse
Corsair HX620 Antec 300 G5 
  hide details  
Reply
My System
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 860 Asus Maximus III Formula ASUS 5870 8GB G.Skill Ripjaws DDR3 2000 
Hard DriveOSMonitorKeyboard
X25-M 80GB, 1TB WD Black Windows 7 Ultimate 64-bit Asus VW246H Saitek Eclipse 
PowerCaseMouse
Corsair HX620 Antec 300 G5 
  hide details  
Reply
post #7 of 7
Quote:
Originally Posted by shajbot
OK, thanks ENTERPRISE1701 and PirateRule.

Does this also apply to AGP graphic card? I see an option in BIOS say enable spread spectrum, so I would disable it to get better perf?
Yes if there is an option to disable it i would do so.
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