Maximus IV Extreme P67 need some help

[przezzmek]

Hello guys!
I have some problems while trying to push my system to the max.
My i5 2500k can handle 5Ghz (liquid cooling) on various stress testing programs whitout any problems and i am very happy with it. Problems come when I lower the CPU ratio to 45 and try to push my DDR a bit further with BCLK 107.2 to get 2000MHz (GeiL EVOTWO 8GB (2x4GB) DDR3 PC3-15000C9 1866MHz) turns out i cant pc fail to boot on this BCLK and also on every other BCLK different from 100 it wont boot.
Anyone could help me solve that problem?

[HiVizMan]

Hello

Please post your voltages and settings that you have changed in the BIOS when you try to over clock your BCLK.

[przezzmek]

I have been trying both loosening the timings and playing with voltages nothing helps and that is my secunde set of ram modules first one was Corsair Vengeance and had the same problem.
I have read couple articles about that ram and it can do much better then 1866 but just can not find a solution to this issue.

[HiVizMan]

First thing to do is enable the PLL Overvoltage from auto to enabled.

The next thing you need to do is confirm that your CPU can actually do that BCLK. Not all can.

Set your RAM to 1600MHz to ensure that it is not the ram holding you back.

Start with a BCLK of 101

Boot into OS.

Reset and change BCLK up one more = 102

Repeat until your system will not post.

I suspect your system will reach a upper max at about 105.8 that is the average when at 45x multi.

[przezzmek]

I set everything like you wrote and you were very close max BCLK whit I was able to boot into OS is 105.4 on 45xmulti.
All the other voltages remains the same like on screens that i posted b4 apart from Ram that i decreased like you advised to 1600MHz and now runs on 1687.
What would you recommend to get the moust out of Ram modules?

[moorhen2]

Your Ram may be able to do above 1866,but the chances are your IMC cant handle the extra stress being put on it,BCLK of 107 is extremely high for Sandy,would take an exceptional chip to run at that.

[HiVizMan]

What you can do is increase the multi of your ram and then drop the BCLK below 100 to try and find your max ram speed. It is easy to up the CPU speed with the multi.

Thinking outside the box. 🙂