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Haswell and power saving

oldestgregg

oldestgregg

oldestgregg

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As the title says basically- Which power saving options does everyone turn on? I have them all turned off now and the windows option to high performance but want to turn them on. Do I turn c1e/c3-6 and eist on or some of them? Also do I need to enable power saving in windows to benefit? I have it clocked @4.5 now but dont want it running like that all the time.
 
If you are using manual voltage the clocks and voltage will not drop, you need auto or offset voltage.

Enabale C1E and EIST for power saving, you can enable C7 power saving but your power supply needs to support this mode to utilize it.
 
I have all those power saving modes enabled in the BIOS but I set my Windows 8 power profile to never go in to sleep mode.

Does that mean my CPU will always be using a lot more power than required?
 
Used adaptive voltage instead of manual and then input the vcore you want into the max turbo voltage field. If you use manual voltage control it wont scale the voltage with the CPU speed.

I'd not recommend stress testing with aida64 or prime with adaptive voltage though as I've read haswell will overvolt itself under them sort of loads.
 
remember to set to balanced power profile in windows power saving

setting a fixed cpu voltage on haswell will still allow idle downclocking aslong as all the c states/intel speedstep and eist are enabled and balanced power profile in windows
 
If you manually set voltage it will stay ramped up I've found, which is annoying. This is why I do not overclock it, as its auto voltage or nothing.

Otherwise it ramps down to 800mhz often, if you set 8 to power saver mode it will not get out of 800mhz, I do it when I'm leaving the pc torrenting, and often I forget to reset it, its bloody nippy still at 800mhz suprisingly.
 
Yeah mine ramps down to 800mhz, even when using Youtube and Spotify. Just goes to show very little grunt is actually required other than for gaming and encoding.

I have Balanced power but turned off Sleep mode completely. Presume this prevents the CPU going in to a power-saving state.
 
Deus Ex said:
If you manually set voltage it will stay ramped up I've found, which is annoying. This is why I do not overclock it, as its auto voltage or nothing.

Otherwise it ramps down to 800mhz often, if you set 8 to power saver mode it will not get out of 800mhz, I do it when I'm leaving the pc torrenting, and often I forget to reset it, its bloody nippy still at 800mhz suprisingly.
Click to expand...

what board? so far ive seen asus still ramp down with a fixed voltage,think I saw some gigabyte boards also but not sure
 
wazza300 said:
what board? so far ive seen asus still ramp down with a fixed voltage,think I saw some gigabyte boards also but not sure
Click to expand...

My asus board doesn't ramp down the voltage if I set it manually. It does reduce the clock speed all the way down to 800mhz but the voltage stays locked at 1.31 unless I use adaptive mode in the bios (or offset but adaptive is better)
 
Jeps said:
My asus board doesn't ramp down the voltage if I set it manually. It does reduce the clock speed all the way down to 800mhz but the voltage stays locked at 1.31 unless I use adaptive mode in the bios (or offset but adaptive is better)
Click to expand...

even with setting power saving to balanced in windows?:confused:

its same as its always been then,sure some folks on here were claiming it downclocked with a fixed voltage
 
less than 1v

but how high your overclocked and howmuch offset affects idle voltage slightly

EDIT: Guys your wrong

Haswell DOES downclock in volts/speed using a FIXED cpu voltage at idle

be sure to use latest cpu-z or gigabytes own skinned cpu-z


Has to be cpu-z 1.64.0 to show idle voltage;)
 
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wazza300 said:
less than 1v

but how high your overclocked and howmuch offset affects idle voltage slightly

EDIT: Guys your wrong

Haswell DOES downclock in volts/speed using a FIXED cpu voltage at idle

be sure to use latest cpu-z or gigabytes own skinned cpu-z


Has to be cpu-z 1.64.0 to show idle voltage;)
Click to expand...

I was previously using cpu-z 1.62 which was showing the down clocked voltage in adaptive mode. I've since upgraded to 1.64 and its identical. It downvolts with adaptive mode but not with manual voltage. Just checked and i am using balanced mode in windows.

I have a maximus VI hero and there are 3 voltage options on my motherboard.

Manual: Just has one field to input the voltage you want. Doesn't allow downvolting at lower clocks.

Offset: You input a + or - offset voltage which is added or subtracted to the stock vcore of your cpu. (i would put in 0.13 for 1.31 volts) This mode applys the offset to all voltages the cpu runs at so it will downvolt, but even the lower voltage points will apply the offset and be higher then normal.

Adaptive: You input the voltage you want (in my case 1.31v) into the max turbo voltage field. At full speed you get that voltage, at lower speeds the chip uses the stock voltages programed by intel. Max power savings are achieved.

http://rog.asus.com/242142013/labels/rog-exclusive/maximus-vi-series-uefi-guide-for-overclocking/6/

They go into a bit more detail there but that is how it works. Maybe its a rog specific thing?
 
Check all power saving is enabled,it should downclock on a fixed CPU v,make sure you use balanced profile in windows
 
wazza300 said:
what board? so far ive seen asus still ramp down with a fixed voltage,think I saw some gigabyte boards also but not sure
Click to expand...

MSI z87 peasent edition/g43.

I jest, its been a great board, even though its not priced high. I got it when there was a Stonking deal for it and a poor mans corsair (cooler master seidon) for £109 shipped.
 
The latest version reads the wrong voltage completely and shows 1.7v. I'm using the version you suggested and it reads the idle voltage as if i switch to adaptive mode, it shows around 0.7v at 800mhz.

This is an extract from the link i posted:

Manual Mode: Sets a static voltage for the associated rail. Using a static voltage means the voltage will not change according to processor load. Manual mode is therefore a less efficient way of overclocking the processor
Click to expand...

Seriously it doesn't downvolt in manual mode. I've tested it myself and the quote above confirms my findings.
 
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