Rampage IV Black Edition with Corsair CMD16GX3M2A2400C10 (Ver4.21)(XMP)

[hooi89]

Hi guy,

I'm trying to set into XMP mode with CMD16GX3M2A2400C10 (Ver4.21)(XMP) & Intel Core i 7 4960x. But unable to boot pc and keep on restart until i turn off the main power. Anyone face this problem before?:cool:

[jab383]

Hi, hooi89

That repeated reboot happens when the BIOS can't quite make the RAM work -- happens to me a lot when I push RAM timing a little too hard. That is what the MEMOK button on the motherboard is for. Press that button while a boot is in progress. The board will reboot, maybe a few more times, while BIOS tries to read SPD data from the RAMs and find a set of timing settings that does work. When that succeeds, the boot should end up in BIOS where you can apply or change the XMP settings for the DDR3-2400.

Check out the MEMOK button in the R4BE manual for more insight.

Jeff

[Raja]

hooi89 wrote:
Hi guy,

I'm trying to set into XMP mode with CMD16GX3M2A2400C10 (Ver4.21)(XMP) & Intel Core i 7 4960x. But unable to boot pc and keep on restart until i turn off the main power. Anyone face this problem before?:cool:

Single kit or two kits together?

Which UEFI version?

[hooi89]

Hi Guy,

I had used the Memok button. But after i successfully set Dram to 2400Mhz, but my processor ( 4960X ) can only OC up to 4.1Ghz. If i go further, system will be unstable.

Please advice.

[Raja]

Check OC guides on the forum for Ivy-E.

Might need to increase VCore or VCCSA.

-Raja

[nut]

I've noticed when I have a no boot the bios is always trying to set my command rate for my memory to 1T instead of 2T.

[Raja]

That's because the board POSTed with defaults at JEDEC timings. It is perfectly normal for that to happen and that's spec.

[nut]

Question for Raja@ASUS. Is 1T a default timming for my board. When the bios defaults on a hit F1 on a boot failure the only memory timing it changes is 2t to 1t all the other manual timings stay the same 9-11-10-27@ 2133. My quess is that the reason for a no boot is because the bios is changing my 2t to 1t.

[Raja]

nut wrote:
Question for Raja@ASUS. Is 1T a default timming for my board. When the bios defaults on a hit F1 on a boot failure the only memory timing it changes is 2t to 1t all the other manual timings stay the same 9-11-10-27@ 2133. My quess is that the reason for a no boot is because the bios is changing my 2t to 1t.

Let me try and say this so it's more conclusive for you and we don't go round in circles:

No, even though UEFI is showing you the primary timings that have been set by XMP, when you have a failed POST the board will come back at JEDEC timings and allow you to save the original timings again.


Your system is not unstable due to the board trying to apply 1T on its own. It is happening because the DRAM is likely unstable. You then get a failed POST, which leads to a safe POST where you see 1T and mistakenly think that's what caused the issue - when it is not it.

You need to dial that DRAM in for stability. If after reading what I have written above you are still in disbelief, then you can even set 2T manually, to put your mind at rest from the board having "poltergeist effect" on 1T on its own.

-Raja

[nut]

Thank you for reply Raja@ASUS