3570k Multiplier fixed at 41?

Drollic · 10 Oct 2013 at 19:24

Fairly new to overclocking cpu's although understand the basics. I'm looking for a 4.3ghz turbo overclock on my 3570k with the bclk at 100 and the multiplier set to 43. All cores are set to 43 and sync control is enabled as is asus multicore enhancement. Problem is, when I boot into windows (BIOS states turbo of 4.3ghz) I get a multiplier of 41 and 4100mhz max on all 4 cores in hwinfo. See attached:

Why is this and how do I get to 4.3 instead of the 4.1 without increasing the bclk (Seemingly can only do it currently with increasing the bclk past 100 which is possibly causing my gpu to become unstable). Also as a sidenote i want to use offset voltage and have set llc to high as an initial test.

wazza300 · 10 Oct 2013 at 19:46

set the cpu multi to 43x in the bios

leave all turbo ratios on auto

Drollic · 10 Oct 2013 at 21:37

wazza300 said:
set the cpu multi to 43x in the bios

leave all turbo ratios on auto

How is this done as I thought that's what I did?

wazza300 · 10 Oct 2013 at 21:39

Did you manually set the bclk to 100,and CPU multi to 43x,

Makesure you do that in the oc section of the BIOS

Drollic · 10 Oct 2013 at 21:49

wazza300 said:
Did you manually set the bclk to 100,and CPU multi to 43x,

Makesure you do that in the oc section of the BIOS

In the Asus Ai tweaker part of the Bios I have Bclk at 100, Asus multicore enhance enabled, turbo ratio manual, ratio synchronizing control enabled, all core ratios at 43, internal pll overvoltage auto, Cpu bus Dram speed ratio auto, mem frequency 1866

The target Cpu turbo mode speed correctly says 4300mhz... Is hwinfo just wrong?

wazza300 · 10 Oct 2013 at 22:05

Not sure,download CPU-z and look in that while stressing CPU

Drollic · 10 Oct 2013 at 22:27

I'm not doing mine like this series of screen shots. Seemingly this will run a constant voltage at 1.25v and clock of 4300mhz without down clocking when the cpu isn't under load ?

http://www.overclock.net/t/1323214/overclocking-i5-3570k-using-asus-p8z77-v-lx

wazza300 · 10 Oct 2013 at 22:34

How much offset are you using? For 4.3ghz I would maybe try a negative to undervolt slightly,maybe -0.005v,keep all turbo ratios on auto and just set CPU multi to 43x and bclk to 100

That's all I do for both my asus and gigabyte boards

Drollic · 10 Oct 2013 at 22:52

Can't even get it past 41 no matter what seemingly.. It's like it's locked at 41 and only Bclk increases can increase the cores speed.

wazza300 · 10 Oct 2013 at 23:02

What BIOS version? Sometimes reflashing the BIOS helps as it sometimes sticks in applying/saving settings,but flash to latest bios if you havnt already

Drollic · 10 Oct 2013 at 23:41

***Fixed - With LLC on High and offset voltage default up to +0.030 it seems as though the BIOS was resetting itself back to previous settings automatically, instead of simply not booting with those settings. This is presumably because not quite enough voltage was available for 4.3. It's quite clever, although I've been out of the loop with pc's until recently and wasn't aware a board could do this. Now I have increased offset voltage to +0.050 with LLC still on high, it has correctly loaded into Windows showing max clocks of 4300mhz on all cores.

The surprising thing is I would have expected with the setting on High and +0.050 as the offset, perhaps a max voltage of 1.250-1.260. Instead, its only 1.226. I do have two higher options for LLC though I guess.

I'll try prime over the weekend and keep it on high likely raising offset a little more to begin with and dropping the offset bit by bit if it's stable.

wazza300 · 11 Oct 2013 at 00:06

Ahh well atleast you fixed it,I wouldn't have thought you needed so much offset for 4.3ghz but 1.26v for CPU is fine,aslong as its stable it doesn't really matter how much it droops

Usually you get a msg crop up saying oc/bios settings failed ect but Nvm

Drollic · 12 Oct 2013 at 11:42

Seems currently stable at 1.216v with a max showing in hwinfo of 1.231v. So far done just under 2 hours on prime95 blend with it showing an almost constant of 1.216v as its running. I have the offset on +0.075. At +0.060 I had a random freeze whilst not doing anything and presumably this is due to the change in core speed and voltages due to using offset as opposed to being fixed. Should I increase my LLC from high to very high to combat this or should going from 0.060 to 0.075 help fix this? I presume it's vdroop that resulted in the freeze?

wazza300 · 12 Oct 2013 at 19:38

either will do,higher llc slightly lower offset and vice versa

offset should be stable ive never had issues with it,just add one/two more clicks to cure the freezing

Drollic · 13 Oct 2013 at 18:07

Yer settled for +0.080 with llc on high which it states is 50 percent. No issues at all so far and good temps. Prime was fine at 0.075 so bumped it one notch just to be safe.