Help me with a strange XMP ram/mobo issue...

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D4rkParadise7

D4rkParadise7

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Jul 1, 2016
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So I had this kit of ram since I built my PC 2 years ago running them nice and fine at XMP profile at 3000mhz and lately I found them again in stock at a decent price so I bought another kit to have 16gb...... the problem is that the XMP is no longer working.... is giving me OC failure.... at the start I believed that new kit is faulty so I took out the old kit from DIMM Slot 2 and 4 and put only the new one there and to my surprise it was working again with XMP at 3000mhz.... after that I took them out and put the old kit only on DIMM Slot 1 and 3 and I found out that maybe the slots are crazy -_- because It was not working with XPM again, it would give me OC fail again.... Funny is that if I would try the second XMP profile on 2666Mhz with ram only on DIMM Slot 1 and 3 It would work, but If I put both kits the XMP once again would fail on 2666Mhz....

This is the Motherboard that I have and the bios is the latest version. The CPU Is OC at 4.5 but I tried with default settings too ... no luck.
Is there any way to get all my ram working on 3000Mhz? I know that there is not a really big performance improvement, but I hate and it's killing me when I think that I can't use my ram at its full potential.....

P.S After some other research I found out that the problem might be the CPU.... I got an I7 6700K and the Max Memory Bandwidth is 34.1GB/s not sure if this is the problem or not.......
 
Solution
Vic 40
Just might be that combining the two kits just won't work at rated speed,it's always a gamble to combine kits. They already work at 1.35V at rated speed so adding some voltage will go over what is called safe values.
Thinking about adding voltage to the Memory Controller,but don't know,since the cpu is overclocked,if that's a good idea. What is the voltage for that right now? (have to look into the bios for this)

From this article,

Chapter: "How Do I Set DRAM To Run To Spec?".

Ensure your CPU is capable of running the frequency/data rate. If both of these requirements are met but the memory isn’t stable, a small increase in DRAM voltage or MC voltage might be needed. On Intel, I usually suggest about +5mV (0.005V) to either...
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Vic 40

Vic 40

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Just might be that combining the two kits just won't work at rated speed,it's always a gamble to combine kits. They already work at 1.35V at rated speed so adding some voltage will go over what is called safe values.
Thinking about adding voltage to the Memory Controller,but don't know,since the cpu is overclocked,if that's a good idea. What is the voltage for that right now? (have to look into the bios for this)

From this article,

Chapter: "How Do I Set DRAM To Run To Spec?".

Ensure your CPU is capable of running the frequency/data rate. If both of these requirements are met but the memory isn’t stable, a small increase in DRAM voltage or MC voltage might be needed. On Intel, I usually suggest about +5mV (0.005V) to either the DRAM voltage, the MC voltage or both. To locate the MC voltage, look for something like CPUVTT, DDRVTT, QPI/VTT or VCCIO. Some motherboards incorporate the MC voltage into the system agent voltage or VCCSA; this is seen most often in LGA 2011. Exercise caution by checking to see what other users have found to be safe and beneficial.
Click to expand...
Maybe that article will be of help anyway.

Another why mixing ram can give issues,
http://www.tomshardware.com/reviews/ddr-dram-myths,4155.html#p4
look at "Just Adding More Dram".

 
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