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what is core c6 state exactly?

post #1 of 4
Thread Starter 
I read in another thread that is should be disabled, and i got a higher bench score compared to it enabled on a higher clockspeed.
see screenshot, 4ghz beat 4.1ghz in cinebench




other settings are the same.
turbo core = disabled
vcore = 1.37
northbridge = stock
ht = stock
bus speed = stock
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post #2 of 4
Quote:
This was an implementation decision made during Microsoft’s Windows NT kernel design, and based on our experiences with both processor vendors' hardware, it wasn't considered a "feature" to either company. Of course, it affected Intel in a much different way than AMD. The problem Intel had in Vista was one of power consumption. For every migration, you had to write-combine the Nehalem architecture’s L3 cache, which cost power.


This changes with Windows 7 and a feature called ideal core. If a task’s needs are being addressed by one core, the operating system will let you stay there. This means two things to Intel: first, you don’t use power on the migration, and second, idle cores are able to remain in a C6 state. Purportedly, this migration fix alone will yield an extra 10 to 15 minutes of battery life on Nehalem-based notebooks, though this won’t become a major issue until the mobile dual-core Arrandale launches later this year. Perhaps more interesting, though, is that processors without C6 will not realize this gain (including AMD’s CPUs).”

Source;

http://www.tomshardware.com/reviews/fx-8150-zambezi-bulldozer-990fx,3043-7.html
 
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post #3 of 4
Thread Starter 

so it basically turns the other cores in a sort of sleep mode if one or two are enough for the task?
i wonder still how i gained a higher benchmark score when the test uses all cores at 100%

do you know if there are any other power saving features that i should turn off to gain some speed?
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post #4 of 4
If you want maximum performance turn off C1 (help with DPC latency -sound card dont like C1) ,CnQ (i am disabling this since i was using X2 6400+ -it was always dropping the peak performance enabled ) ,APM (to avoid throttling) , C6 (avoid parking ,even though the patches on W7 do this smarter) .
Also turbo core should be turned off as when you are playing with the others enumerated seems to not kick in if ever was (rarely seen it working on my 4100FX with my 970A-UD3 .i suspect the mobo in culprit .
The turbo clock can be considered a safe overclocking shelf.
Of course the CnQ and C6 off means more power consumption if you care about this.
You can gain more performance by setting the HT at 2600 manually if you are lucky to use a board that sets it default ay 2400MT for unknown reasons (as my board does)
   
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