Quote Originally Posted by Tunagoblin View Post
No no. I know the molex 4-pin header is for extra juice for SLI/Xfire.
But you stated as follow:

1. The CPU fan headers are controllable, the 4 pin header is there for the benefit of the intel stock coolers mainly but can be used with just 3 pin fans too.
2. AFAIK, the PWM fan header isn't controllable. Using Speedfan might work on it.

The bold part that I'm confused about.
Since there are 2xCPU Fan header in Extreme4, one with 4-pin, other with 3-pin.
I thought the 4-pin CPU fan header is PWM since it's 4-pin. no?
According to you it is different between the 4-pin CPU fan header and PWM header?
Maybe I'm taking this "PWM" wrong...
I'm confused...

Oh and btw, what do you do to make you think your system is stable?
I'm asking this because the term "stable" I've seen on lots of forum posts but everyone does it different way.
Of course it depends on what each person do and wants from their computer, though.

This is what I do for now.
For quick test, I run LinX w/AVX "ALL" setting (6000MB+ for me since I have 8GB) run that 3 times.
And/or run Prime95 custom setting similar to "In place large FFTs" with "Run ffts in-place" checked.
Also make the min fft size to "1024". Run it for 20 min or so.
If it passes those tests and happy with the OC settings I have, I run Prime95 "blend" test for 10+ hours.
For RAM OC, just run Prime95 Blend for as long as it takes.
For GPU, I run 3Dmark11/vantage, Heaven 2.5, and just play BFBC2 max setting on 32ppl server.
Check your manual There is a diagram a few pages in listing what is what. The 3 and 4 pin fan headers are listed as CPU fan headers, where the fan header near the 8 pin ATX connection is listed as the power fan connector (PWM). For stability I run BOINC, specifically, SETI to check for stability. I just load up a bunch of SETI tasks to make sure all 4 cores are 100% loaded and let it run while I do other general day to day stuff on the system. I use HCI memtest to check the stability of any memory OC and I sometimes use IBT w\ AVX using the maximum amount of memory my system has available.

Quote Originally Posted by jd299 View Post
I'm using a 64 bit OS so I guess I won't touch the MMIO then (since it's apparently set to default to 1024 which is optimal for 64 bit systems right?)

Oh and I'm guessing the XMP profile will also load the voltage setting?
Check MMIO is indeed 1024, but even with it set at 64 its not going to do any harm. Correct voltage for your memory should be applied by default without having to load the XMP but this will depend on the speed data the manufacturer has pre-programmed to the memory modules, so setting the voltage manually might be required.