Can't dual channel memory, is it compatibility issue or what? 3600Mhz

[Booterbotter]

Hi,

 

 

Just looking for 2nd opinion. Does the Sided = Single, Side = 8GB means that this ram is not fully compatible because it's not telling us it's 16GB?
But it's confusing part is the DIMM stating 1 | 2 | 4 DIMM, the 1st and 2nd slots are checked. Or maybe it means 4x2 dual channel or what?  To further elaborate the issue, I'll give the details below the screenshots..

 

Ryzen 5 3600

MSI B450 Tomahawk Max (latest bios version)

https://www.msi.com/Motherboard/support/B450-TOMAHAWK-MAX#support-mem-19

Under Compatibility > Memory RX-3X00 / Matisse, you should be able to search the ram sku model below.

 

8x2 GB Corsair Vengance Pro 3600mhz -  CL 18-22-22-42 

www.corsair.com/ca/en/Categories/Products/Memory/Vengeance-PRO-RGB-Black/p/CMW16GX4M2Z3600C18 

 

 

 

So using XMP Profile 1 or 2, MSI's Memory Try It in Bios or Manual OC timing for the ram to set it to 3600Mhz. It just does not work properly. Doing a memory test would ALWAYS FAIL.
The weird part is, if I test the ram individually (just 1 pc with 3600Mhz set in the bios), it will ALWAYS PASS. 

Which leads to the question, this is a compatibility issue I guess? 
Checking MSI motherboards website, there are some ram with Sided = Dual and it shows 16GB, and 3 checks. Just a bit confused on this issue. 
I don't think it might be a hardware defect because it works if you use it just 1 pc of 8GB set to 3600Mhz (both of the ram works that way, they just want to be alone? lol) 

 

[GrockleTD]

this may be too obvious, but do you have the RAM in the correct slots for dual channel?

[Booterbotter]

3 minutes ago, GrockleTD said:

this may be too obvious, but do you have the RAM in the correct slots for dual channel?

Yup, forgot to elaborate that part.
It works 8x2 = 16GB even if I go into windows. The problem is when I do a memtest it always fails when it's on 3600Mhz. 

Usually if it's just wrong slots, there will be a message that you it's not optimized or something right? 
BTW, was using a 2666Mhz 8x2 before and that was working fine so pretty sure it's the rights dimm slots

[badreg]

To clear up your confusion regarding the QVL:

Single and Dual refer to the ranks on the DIMMs, not the number of channels.

 

The size in GB refers to the size of each DIMM, and the check boxes refer to the number of DIMMs that were successfully validated. For example, 8GB and three checkboxes means that 1x8, 2x8, and 4x8 were all validated.

[GrockleTD]

hmm. i honestly don't know what to say then, i'm running the same spec. memory, and it's on the knifes edge of stability for my own part, just barely got it working this morning so... i'm not the best help here if i'm honest

[Booterbotter]

1 minute ago, GrockleTD said:

hmm. i honestly don't know what to say then, i'm running the same spec. memory, and it's on the knifes edge of stability for my own part, just barely got it working this morning so... i'm not the best help here if i'm honest

You mean exactly the same motherboard, cpu and memory? That one I linked above? 
That's really gonna help because if it works for you then it's probably a defect on the one I have now? O_o

 

 

2 minutes ago, badreg said:

To clear up your confusion regarding the QVL:

Single and Dual refer to the ranks on the DIMMs, not the number of channels.

 

The size in GB refers to the size of each DIMM, and the check boxes refer to the number of DIMMs that were successfully validated. For example, 8GB and three checkboxes means that 1x8, 2x8, and 4x8 were all validated.

So you mean it should be fine right? It should be compatible to dual channel 8x2 3600Mhz? Mine works but the memory test always fails.

[GrockleTD]

Just now, Booterbotter said:

You mean exactly the same motherboard, cpu and memory? That one I linked above? 
That's really gonna help because if it works for you then it's probably a defect on the one I have now? O_o

no just the memory sorry. the vengeance Pro RGB uses the same memory chips as the dominator platinum RGB

[Booterbotter]

Just now, GrockleTD said:

no just the memory sorry. the vengeance Pro RGB uses the same memory chips as the dominator platinum RGB

Oh, got it! It's ok, I am thinking the issue is on my motherboard or just bad memory or just a compatibility issue lol. 

[badreg]

9 minutes ago, Booterbotter said:

So you mean it should be fine right? It should be compatible to dual channel 8x2 3600Mhz? Mine works but the memory test always fails.

It has been validated by MSI to work at 2x8 3600Mhz CL18, but that doesn't mean it is guaranteed to be stable for every build. It is ultimately down to the IMC of your specific 3600.

 

Please post a screenshot of the Memory tab of CPU-Z. If you are not stable at XMP settings, you can start loosening timings until you can pass memtest86 without errors.

[miagisan]

You didn't answer if it was in dual channel.   Just because it shows 2x8gb doesn't mean it's in dual channel.  Slots 2 and 4 on the mobo is what you want.   

[Booterbotter]

4 hours ago, miagisan said:

You didn't answer if it was in dual channel.   Just because it shows 2x8gb doesn't mean it's in dual channel.  Slots 2 and 4 on the mobo is what you want.   

It's on 2 and 4

 

4 hours ago, badreg said:

It has been validated by MSI to work at 2x8 3600Mhz CL18, but that doesn't mean it is guaranteed to be stable for every build. It is ultimately down to the IMC of your specific 3600.

 

Please post a screenshot of the Memory tab of CPU-Z. If you are not stable at XMP settings, you can start loosening timings until you can pass memtest86 without errors.

 

 

 

[badreg]

3 hours ago, Booterbotter said:

 

 

 

XMP seems to be off based on that screenshot. XMP timings are 18-22-22-42 at 3600Mhz. If they're not stable at those timings, try loosening everything by one clock cycle and see if it will pass memtest86.

[Booterbotter]

9 hours ago, badreg said:

XMP seems to be off based on that screenshot. XMP timings are 18-22-22-42 at 3600Mhz. If they're not stable at those timings, try loosening everything by one clock cycle and see if it will pass memtest86.

So tried all possible combination for 3600, cl rates and all. It only worked and stable at 2800 cl 14-15-15-15-35

8x2 dual channel in mem test and benchmarks.

Is it safe to rule out a compatibility issue? Can't say it's a hardware issue because using 1pc of the 2 dimms, on slot 2 and slot 4. They work individually 3600Mhz.
slot 2 = 1pc ram 3600mhz cl 18

slot 4 = 1pc ram 3600mhz cl 18

 

not sure what to try next at this point

[badreg]

1 hour ago, Booterbotter said:

So tried all possible combination for 3600, cl rates and all. It only worked and stable at 2800 cl 14-15-15-15-35

8x2 dual channel in mem test and benchmarks.

Is it safe to rule out a compatibility issue? Can't say it's a hardware issue because using 1pc of the 2 dimms, on slot 2 and slot 4. They work individually 3600Mhz.
slot 2 = 1pc ram 3600mhz cl 18

slot 4 = 1pc ram 3600mhz cl 18

 

not sure what to try next at this point

It's not a compatibility issue. More DIMMs put more stress on the IMC, so if XMP works with one stick, but not two, that means that it is on the edge of stability with one stick.

 

2800 CL14 == 3600 CL18, so it is not CAS latency that is causing instability. Look at the other sub-timings to find the culprit. It would also help to do some research on which specific test you are failing on, as the different tests in memtest86 hint at specific problems.