G1.Assassin 920 Overclock

[WrathWolf]

I recently upgraded from a EVGA x58 SLI where I had a stable 4Ghz clock.
I am having some difficulty getting a stable i7 920 OC to 4Ghz on this motherboard. Maybe because I can't set 1.65v specifically? (The board will only let me choose 1.64 or 1.66v for whatever reason).
I am not an experienced OCer.  Can someone please help?
I have the G1.Assassin, the i7 920, and TR3X6G1600C8D Corsair Dominator 1600Mhz RAM (8-8-8-24) RAM
These are my current settings:
Turbo Boost Disabled
All C states disabled, Thermal monitor and etc..
QPI x36
Bcllk 200Mhz
System Memory Multiplier 6.0 (1200Mhz)
Uncore x13
QPI/VTT 1.515v
Vcore 1.475
IOH 1.4v
IOH I/O 1.64v
ICH 1.250

[Dark Mantis]

Hi and welcome to the Gigabyte forum.

First thing I noticed was that your QPI/Vtt was very high. It must be kept within 0.5v of your memory voltage but that normally assumes underneath! I would have thought somewhere nearer 1.2 - 1.4v.

You havent said exactly how much memory you have installed. If it is just three sticks then fine if you have all the banks filled that is a different matter and we will discuss this if it is that way. The 1.66v will actually run at about 1.64v in reality. So you can up that a little.

[WrathWolf]

I have all 6 banks filled (12GB).
I didn't mention that I also had my DIMM voltage to 1.64v
When I had my EVGA board, thats what I had and it was stable..
But I was also running a 2:8 memory multiplier.

How should I proceed?

[Dark Mantis]

Ah, that makes a lot of difference then.

You will need to increase the memory voltage to about 1.7v to compensate for the extra loading on the memory controller.

Your QPI/Vtt will need to be set to somewhere in between 1.2 and 1.46 volts. This will need to be trial and error as it can vary. Try at 1.2 and work upwards until it gets stable.

If you have your memory multiplier set at "X" then set the Uncore multiplier to "2X" or a maximum of "2X + 2"

Obviously your memory timing should be set to default 8-8-8-24

[WrathWolf]

System will not even post with those settings.

[Alundran]

this may sound odd but it worked great for mine

all i did was turn off turbo and set the bclk to 200
left everythin as auto for volts as it seems gigabyte boards prefer it that way

the only things i set were my memory timings, multiplier and volts

stressed for 3 days straight without a whisper of any problems

[WrathWolf]

Thats actually what I tried first.  That didn't work either. 
This whole thing not being able to have a 4GHz stable OC is really upsetting me.
I had a stable 4.2Ghz on my EVGA X58 board but then VREG temps started to get out of control, bumped it down to 4, and then 3.8.  Eventually still getting 70C temps at idle is what made me buy this board.... and so far its not doing me any good. 

I know there isn't allot of other things that someone could suggest, but does anyone else have some ideas?

[WrathWolf]

Ok, I found the perfect way to fix this issue.  Pretty simple actually.
I used my Intel employee discount (I work in the LAN Access Division) to go get a 990X and then set the clock multiplier to 30X.
BAM.  4Ghz.  Problem solved.


P.S.
Thanks for at least tryin to help me guys.  They were pretty quick responses.
Unfortunately they just were not doing the trick. My "brute force" method of resolving the issue is an acceptable alternative though. 

[Dark Mantis]

I must admit I do like your style!   The old big hammer to crack a walnut seems to spring to mind but it does work.

If I don't tell anyone else can you get me a discounted 990X ?