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Speedstep, what's the point?

post #1 of 6
Thread Starter 
I'm working on OC'ing my i7 950 and I wanted to make use of the power saving options (C-states, C1E, Speedstep) so my pc uses less power when idle, which is most of the time. The OC'ing is going fine, but the power saving is a bit weird.

- With Speedstep enabled my pc uses 10-15W more, both when idle as under full load.
- With Speedstep disabled my cpu, according to realtemp, still underclock's its multiplier. CPU-Z doesn't seem to notice it.

My OC at the moment is 180x23 but when the pc is idle realtemp reports that the MP drops to as low as 12, with Speedstep disabled.

I thought that Speedstep was used to downclock the cpu when idle to save power, that's what most people say it does anyway. So I wonder what the real purpose of Speedstep is.
My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
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My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
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post #2 of 6
Are you using something like a Kill-A-Watt to verify power usage?
Waiting on X399
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AMD Phenom II B57 @ X4 3.9 Gigabyte 790FXTA-UD5 Sapphire Radeon 290 8 GB G.Skill 2133 
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250 GB 840 EVO Noctua NH-D14 Windows 10 Logitech K350 
PowerCaseMouseMouse Pad
Seasonic x750 Corsair 600T Logitech G100s Razer Goliathus Speed 
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Plantronics Gamecom 788 
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Waiting on X399
(13 items)
 
  
CPUMotherboardGraphicsRAM
AMD Phenom II B57 @ X4 3.9 Gigabyte 790FXTA-UD5 Sapphire Radeon 290 8 GB G.Skill 2133 
Hard DriveCoolingOSKeyboard
250 GB 840 EVO Noctua NH-D14 Windows 10 Logitech K350 
PowerCaseMouseMouse Pad
Seasonic x750 Corsair 600T Logitech G100s Razer Goliathus Speed 
Audio
Plantronics Gamecom 788 
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post #3 of 6
C1E is used to lower the MP when idle.
Speedstep is what I believed to lower the voltage on the CPU when idle...?
post #4 of 6
1. What are you using to verify the power usage?

2. Does your motherboard support something similar to gigabytes dynamic vcore setting? This lets you overclock and still have the Vcore drop drastically during idle just like it does at default speeds.
post #5 of 6
Thread Starter 
I am using a Cresta RCE1106 Wattmeter to check my power usage. Based on some reviews where they were comparing cheap power usage meters with a professional one, this one gave the most accurate (p < 0.05) readings.

I've got Asus Rampage 2 Extreme and I'm not sure if it supports any kind of dynamic Vcore. I checked my Vcore in AIDA64 (Vcore is set at 1.325V in the bios). AIDA is reporting 2 different values, when idle it is 1.3V and at full load it is 1.35V. I am however unsure if this is normal for the Vcore or if it is dynamic adjustments made by the bios.
My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
  hide details  
Reply
My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
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Reply
post #6 of 6
Thread Starter 
It was going so well

I did some more tweaking and I found that disabling C1E and only use the "enable C-states" option saves even more power while the downclocking still happens. Using C1E instead of C-states costs a bit more power and the downclocking happens more slowly and didn't reach the absolute lowest multiplier during my tests.
My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
  hide details  
Reply
My system
(13 items)
 
  
CPUMotherboardGraphicsRAM
i7 950 @ 4.14GHz (180x23) Asus Rampage 2 Extreme 2x GTX 580, 8400 GS 6Gb Corsair XMS3 TR3X6G1600C8 
Hard DriveOSMonitorKeyboard
80Gb Intel SA2M080G2GC Windows 7 Pro 64bit 4x LG W2343T-PF Logitech G15 v1 
PowerCaseMouseMouse Pad
Corsair HX750W CoolerMaster HAF X Logitech G5 Steelseries SC2 
  hide details  
Reply
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