Problem with memory settings

Hello,
i got a brand new PC4000 PRO from corsair and i got problem setting timings with this motherboard (neo2 PFISR - bios  v3.9).
I can't set CAS timing nor to 3 neither to 2, it automatically turns it back to 2.5.
It seems that there is a lot of users having the same issues with this motherboard all over the net, but they told me to post here.
Has anybody an idea why this happen and how i can fix it ?
Thanks,
Fab

Hi there,
For some reason the BIOS settings have a rather confusion relation.
This is what my experiences have been, please try them and report your findings:
- MAT is enabled (and overrules SPD or manual memory timings) if:
Memory clock is set to "auto" within the frequency menu AND you set your perfomance above FAST.
To get a stable system, I'd advice the following:
- Go back to default BIOS settings.
- Disable D.O.T.
- Disable Spread Spectrum
- Fix your memory frequency to what it should be (e.g. 400Mhz), and not AUTO.
- Choose SPD timings for your memory (or set them below SPD timing manually).
- Start with performance settings to SLOW.
Check memory timing settings (chipset) with AIDA or CPU-z.
Check stability with Prime95 & torture test on maximum RAM.
Once the system is table, try upping the speed setting, check the actual timings and see what happens. If you still have problems, take out one memory stick and try with just one (maybe one is faulty).
Once you got it stable, continue from here.
Keep in mind: in my experience, if you set your memory frequency at a fixed frequency and use SPD settings, you will find that upping the performance settings, changes the memory timings! However as long as the frequency is not AUTO, MAT is not enabled, whatever the performance setting.
It really confused me at first, as I could not get the system running with MAT enabled, whatever memory time I entered. But with fix memory frequency, I got the system stable with 2,2,2,5 timing!
If anyone has techdoc on these matters, I'd appreciate an URL.
Bios 2.3 on 865PE neo2-LS
Twin Kingston ValueRam Cl2.5 (winbond)

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