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XMP Help

Sniper_3001
Level 7
Hi guys. So I managed to get a stable 5.1GHz OC at 1.38v with an AVX offset of 1 (temps are around 55-60 at 100% CPU usage at 2hours). Ran both prime95 and realbench for 2 hours and no issues. The problem I'm having though is with XMP. When I turn on XMP and set it to 3866MHz.....it passes Prime95 no problem but fails Realbench after about 10 minutes (I get a blue screen of death with a computer restart). The ram I have is GSkill Trident Z RGB 4133mhz. The only way I can get the computer to boot up at 3866 is if I increase the DRAM Voltage to 1.4, VCCIO to 1.2, CPU System Agent to 1.225 (I have no idea about these values but I saw a video on youtube that said to use these), Dram Timings are all set to Auto and Mode 2. The timings I see from CPU-Z are CL-17, tRCD-25, tRP-25, tRAS-45, tRFC-535, CR-2T. I also tried to turn down the ram speed to 3733MHz keeping everything the same but exactly the same result....fails in Realbench. The timing I get from 3733mhz is CL-15, tRCD-15, tRP-15, tRAS-36, tRFC-654, CR-2T. Do you guys have any ideas what i'm doing wrong or is my memory MHz too high? How do I figure out what VCCIO voltage to use or System Agent voltage to use? I'm so lost.
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13 REPLIES 13

Zka17
Level 16
Holy smoke! 4133MHz RAM...

I never had this platform, but from the previous ones I learned that you first OC the RAM (set XMP), then OC the CPU and then combine...
Have you tried the 4133MHz with the CPU on default setting? Do you know that the IMC is able to do it?

Zka17 wrote:
Holy smoke! 4133MHz RAM...

I never had this platform, but from the previous ones I learned that you first OC the RAM (set XMP), then OC the CPU and then combine...
Have you tried the 4133MHz with the CPU on default setting? Do you know that the IMC is able to do it?


yes. I have tried at default speed. Same thing. *As far as the IMC i don't know. But my motherboard is a Maximus ix Code and says it supports up to 4133mhz

Zka17
Level 16
It is about your particular CPU, not only motherboard... the CPU has the memory controller (IMC) built in - if that can not do, then can't do...
The motherboard can support a CPU which can handle so high memory speeds.

Hmmm. But why can I pass Prime95 and not realbench? I thought prime95 also tests memory stability? Also adjusting vccio will that help out? And how do I figure out by how much? Is there a program to use or just guess?

Sniper_3001 wrote:
Hmmm. But why can I pass Prime95 and not realbench? I thought prime95 also tests memory stability? Also adjusting vccio will that help out? And how do I figure out by how much? Is there a program to use or just guess?


Prime 95=conversion tool
How to convert CPU into heater. All it does is loads the CPU with a repeating instruction that loads it to 100% and stays there. This is why a lot of folks prefer realbench. Thats why they named it realbench. Its REAL applications using REAL scenarios of actual use for multiple operations.

You will often find a lot of issues with XMP and over clocks.
Mine doesn't like it either past a certain point. Especially anything that changes the BCLCK.
I ran mine up the old fashioned way, manually entering the settings.



“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein

Zka17
Level 16
Whenever adjusting voltages, you do in small increments... - I mean, that's what I do...
If you want to test memory stability, use software designed for that: https://rog.asus.com/forum/showthread.php?73665-Our-preferred-memory-stress-test

Where exactly fails in RealBench, which test?

I would read the guide on overclocking Kaby CPU's, there is a part for memory where settings range is listed for VCCIO and CPU System Agent for various ram speed.

hey guys. So I did some more homework and research on google and found the problem. Because I have 2x8 memory sticks someone said to try 1 stick in every slot and see what happens. So Slot#1, does not post with XMP, Slot #2, does not post with XMP, slot #3, posted?!!? wtf. I even got 4000mhz stable?!!?. Tried slot #4, posted at 4000mhz?!?! wtf. So bottom line is that my slot 3&4 work but not 1&2. This is bad because the book says to use slot 2&4 or 1&3. So there is no way for me to turn on XMP with those configures. Should I be contacting Asus or am I missing something? Is this normal?

Zka17
Level 16
Just to understand correctly: Slots 3&4 post both default and XMP and Slots 1&2 only default, no XMP? With the same stick?