Originally Posted by Roman2K
I coundn't manage to reach a stable 4.2 GHz on all cores so I used the Turbo ratio customisation feature of the MIIIF and reached a stable 4.0-to-4.33 GHz.
4 cores active => 4.0 GHz on all cores
3 cores active => 4.16 GHz
2 cores active => 4.16 GHz
1 core active => 4.33 GHz
I used a BCLK of 166 MHz (adjusted to 166.66 by the motherboard, resulting in nice round clock speeds, like with the default 133.33), CPU ratio of 23 and Turbo deltas of +1, +2, +2 and +3. After having tested a lot of BCLK/ratio combinations, rebooting countless times, I think that's the overclock I'm happy with and that I will finally settle on.
With this feature, one uses their 875K's potential to its fullest. Plus, as it's coupled with SpeedStep, it's energy efficient too, making for an actual speed range of 1.5 GHz to 4.33 GHz. What's more, the memory can be clocked at a round 2000 MHz (166.66 x 12).
I think this Turbo ratio customisation feature allows for a perfect, intelligent overclock. It's just takes longer to test for stability (one has to adjust processor affinity in the Task Manager to test each possible number of active cores).
Here's an example of stability test at 166 x (23 + 3) on a single core:
Are you sure that Speedstep working correct, with which application have you verifyed that?
Excuse me for ask but thereÂ´s not many applications that can read this right, so far I have found that Intel turbo boost gadget and Throttlestop can read it.
For me with the MIIIF speedstep works like this, if I increase bclk from 133 to 134 the vcore becomes fixed but the multiplier transit dynamical depending on the workload and it stays that way up to bclk 149, from bclk 150 both the vcore and multiplier are fixed, they doesnÂ´t transit dynamical depending on the workload, thisÂ´s even though speedstep is enabled in the bios.
So if I want to have the full use of the power save feature I have to stay with bclk 133 and I think it is the same with other Asus board, it should be nice if you could verify this with your board.
Originally Posted by iceboi714
I have managed to get 180 bclk with 22 Multi...so its 3972MHz now. Almost 4GHz, I have been tweaking here and there through out the week. Let me know how the FTW turns out for ya. If I went EVGA I would of gone with the CLASSIFIED 200
Temps are hitting 81C with linx...I can probably hit 4.2GHz but with that heat I won't be doing much more with it (more like i don't want to push it any further). I am planning to add side intake to my Corsair 800D and that should help the air flow and improve my temps a bit. Then i'll push it a little more.
Why is it that IÂ´m not surprised, of course you had went for the Classy 200
81C, hmm, what kind of cooler do you have ?
800D is not the best case for air cooling, itÂ´s better suited for water, time to make the transition, get a 360 rad in the top with some good fans and a good cpublock and you should get +4,0GHz with better temp then what you have now.
I took a quick look on it but since one not can software controll the vcore on the new i3,i5,i7, I donÂ´t think one have much use of it if one have a Asus board, sure you can probably still make the multiplier transit.
For me this Asus Turbo Unlocker feature have it all as long I stay with bclk 133.Edited by Ghostleader - 8/1/10 at 2:54am