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colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Hi,

This issue has very definitely cost me time and effort, and obviously when I I spend time discussing RMA's or running multiple Memtest86 runs I am not able to do other productive work.
If this next Corsair Ram Kit arrives and all four sticks will not pass Memtest86 in the motherboard then I will ask for a refund and try other brands.
I will not be accepting any faulty memory from Corsair and spending more on another stick of Corsair RAM in the hope that it might work.

Thanks.

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colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Hi.

(1). The first set of RAM I purchased was selected for the motherboard and processor using Corsair's own RAM selector.
I am and was aware of the Memory QVL list for the Asus Motherboard at the time of purchase. There was no 3200 MHz 16GB sticks on the list.
Asus customer support stated that the QVL is only a list of RAM that was tested at the date of the document, and the fact that the RAM is not on the list does not mean it does not work.

(2). I use Corsair for pretty much every PC component or peripheral I own. This is my first Corsair RAM. It is difficult for me to know what the real quality of Corsair products is unless I know the real failure rates and RMA numbers / percentages.

(3). RE: other than that - who needs 4 banks ram? seriously? for what?
There are 4 slots on AMD Ryzen motherboards so someone must need them for something.
In my case Blender, Asus Ram Cache II, Ram Disk, RX Vega 64 Liquid HBCC needs RAM. Other reasons.    
Purchasing 1 kit of 4 was cheaper than 2 kits of 2.
If I want all four sticks to work together then I need a kit of four.
It should give me the option of running 2 of 16GB on two machines or 1 of 16GB on four if I need to.

Note 3 sticks of 16GB run fine on the first kit I had, they passed Memtest 86 when used all at once to give 48GB .
I was able to run some blender and compute jobs which were using the RAM.

So far this post is about simply trying to get a RAM kit where each of the 4 memory sticks pass Memtest86 individually when run at 2133MHz RAM frequency.

Thanks.

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misterj
Exemplar
Exemplar

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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colesdav, I have seen Threadrippers run with 112GB but not 128GB (7 sticks but not 8).  I think completely filling the memory slots is going to be a little challenging.  You may well need to run at slower than 3200 MHz.  Do you know what chips are used on your sticks?  Ryzen seems to get along best with Samsung B-Dies.  Please run Thaiphoon Burner to see the chips and XMP profiles available.  I have used lots of memory brands over the years including Corsair.  Once I went to G.Skill, I have not tried any other brand.  For Ryzen they have Flare X (for AMD).  Noodles59 is correct, but since the later AGESA releases for AMD, Ryzen is much more forgiving about memory.  So, please make sure you are running the latest BIOS with the latest AGESA.  CPU-Z will tell you the version you are running.

colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Hi,

I have no RAM to test yet. I have not received the 2nd RMA set yet. The machine is down at the moment. I can test and run nothing on it.

I am running the most up to date BIOS on the best ROG motherboard for Ryzen Gen 2. The CPU is Ryzen 2700x so I assume this is the best RAM support I can get (i.e. later AGESA releases for AMD, Ryzen is much more forgiving about memory).

I understand that running 4 sticks at 3200MHz and passing Memtest86 may well be difficult.

The PC with 1 single 16GB stick in the motherboard is failing Memtest 86 at 2133MHz RAM frequency on 50% of the sticks in the RAM kits I have received so far.
1/4 on first kit (25%) failed Memtest86 at 2133MHz.

3/4 on second kit (75%) failed Memtest86 at 2133MHz.

Thanks again for your help. When I get the new RMA RAM I will update this post with the results.

Bye.

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misterj
Exemplar
Exemplar

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Thanks, colesdav.  Hope all turns out well.  Enjoy, John.

colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Thanks again.

I have no update from Corsair regarding when the 2nd set will arrive. 
I have pointed both Corsair and Asus Technical Support to this thread, so any advice you give should help debug this.
It could be I need to adjust RAM timings or voltages just to get passing Memtest86 at low frequency. 
There might be a power supply noise issue. 
I may have just been unlucky and received two sets of bad RAM in a row.  
I am trying to get ASUS and Corsair to work together to test the failed ram I had and on their own modules on the same Asus motherboard with a Ryzen 2700x and see if they can work out what the problem is.  

Rather than just throw in the towel and request a refund I have told them I am prepared to help in any way I can so other AMD Ryzen 2700x users with ROG Crosshair VII (WIFI) do not go through these same Corsair RAM issues. 

Bye for now.  

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misterj
Exemplar
Exemplar

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Thanks, colesdav.  I think the XMP profile should set the memory voltage, but may not set the SOC voltage.  You may want to raise it a little - very little, maybe 0.1 Volt.  Enjoy, John.

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colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Some thoughts / calculations and information on comparing Corsair Vengeance RGb Pro 3200MHz versus 2666MHz 4x16GB memory kits below:


https://www.corsair.com/uk/en/Categories/Products/Memory/Vengeance-PRO-RGB-Black/p/CMW64GX4M4C3200C16#tab-tech-specs

Fan Included No
Memory Series VENGEANCE RGB PRO
Memory Type DDR4
Memory Size 64GB Kit (4 x 16GB)
Tested Latency 16-18-18-36
Tested Voltage 1.35V
Tested Speed 3200MHz
Memory Color BLACK
LED Lighting RGB
Single Zone / Multi-Zone Lighting Individually Addressable
SPD Latency 15-15-15-36
SPD Speed 2133MHz
SPD Voltage 1.2V
Speed Rating PC4-25600 (3200MHz)
Compatibility Intel 100 Series,Intel 200 Series,Intel 300 Series,Intel X299
Heat Spreader Anodized Aluminum
Package Memory Format DIMM
Performance Profile XMP 2.0
Package Memory Pin 288


Some Numbers then:

=========================================================================
Refer to:https://en.wikipedia.org/wiki/DDR4_SDRAM

Standard    Memory    I/O bus Data    Module        Peak Transfer Rate    Timings        Cas Latency     
name        clock    clock        name        (MT/s)            CL-trCD-tRP    (nS)
        (MHz)    (MHz)
            

DDR4-3200W
DDR4-3200AA    400     1600     3200     PC4-25600     25600             20-20-20    12.5
DDR4-3200AC                                     22-22-22    13.75
                                        24-24-24     15
                        
========================================================================
 The above Corsair Numbers are:
===============================
                                                                                     Timings
                                                                                     CL-trCD-tRP-tRAS
"Tested"  1.35V
========
        400     1600     3200     PC4-25600      25600            16-18-18-36    10nS
                                                                                                           (10-11.25-11.25-22.5).
"SPD"     1.2V
=====
        266.67     1066.67 2133.33 PC4-17000     17066.67      15-15-15-36    14.06 nS
                                                                                                             (14.06-14.06-14.06-33.75)
=========================================================================


SPD is basically fail safe settings that the RAM will work at if you don't manually load a profile or manually set the RAM up ram timings yourself in BIOS.
https://en.wikipedia.org/wiki/Serial_presence_detect

I ran MemTest86 at SPD settings.  2133MHz 1.2 Volts.
It should have worked.
 

=========================================================================
Also note the following data for the other Corsair RAM which does say it is supposed to support AMD 400 series motherboards:
https://www.corsair.com/us/en/Categories/Products/Memory/Vengeance-PRO-RGB-Black/p/CMW64GX4M4A2666C16#tab-tech-specs
=========================================================================

Fan Included
No
Memory Series
VENGEANCE RGB PRO
Memory Type
DDR4
Memory Size
64GB Kit (4 x 16GB)
Tested Latency
16-18-18-35
Tested Voltage
1.2V
Tested Speed
2666MHz
Memory Color
BLACK
LED Lighting
RGB
Single Zone / Multi-Zone Lighting
Individually Addressable
SPD Latency
15-15-15-36
SPD Speed
2133MHz
SPD Voltage
1.2V
Speed Rating
PC4-21300 (2666MHz)
Compatibility
Intel 100 Series,Intel 200 Series,Intel 300 Series,Intel X99,Intel X299,AMD 400 Series,AMD 300 Series
Heat Spreader
Anodized Aluminum
Package Memory Format
DIMM
Performance Profile
XMP 2.0
Package Memory Pin
288
========================================================================
 The above Corsair Numbers are:
===============================
                                                                                           Timings
                                                                                           CL-trCD-tRP-tRAS
"Tested"  1.20V
========
        333.33     1333.33 2666.67 PC4-21333     21333.33        16-18-18-35    12nS
                                                                                         (12-13.5-13.5-26.25).

"SPD"     1.2V
=====
        266.67     1066.67 2133.33 PC4-17000     17066.67        15-15-15-36    14.06 nS    
                                                                                         (14.06-14.06-14.06-33.75)
=========================================================================

DDR4 parameters
=============================

First Number  = CL   = CAS Latency = Column Access Strobe Latency. = Time taken for Ram module to respond to a request for data.
Second Number = trCD = Row address to column address delay.
Third number  = tRP  = Row Precharge Time = time to access a new row address.  
Fourth number = tRAS = Row Active Time = MINIMUM amount of time the row must stay open to ensure the row is read properly.

This video is useful:
https://www.youtube.com/watch?v=Yed-a9vqTYc

Conclusion.
===========
It looks like the  Default "SPD" timings are both 2133MHz on both versions of Corsair Vengeance Pro 3200 and 2666 RAM Specs and they have the same SPD timing (15-15-15-36 ) and voltage (1.2 Volts) specification.
Since my Memtest86 tested were run at default SPD speed (2133MHz) then this indicates the Corsair Vengeance Pro 3200MHz memory should pass if the Corsair Vengeance Pro 2666MHz memory passes.
Unless ...
There are internal chip differences in the Ram Sticks and they are not simply binned out to different speeds. 

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colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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I need to format and add some explanation to the above post. It is there to share information with Asus and Corsair.

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colesdav
Esteemed Contributor III

Re: Asus ROG Crosshair Hero VII, Ryzen 2700x, Corsair Vengeance RGB (Pro) 3200 4x16GB Memtest86 failures.

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Asus Technical Support have offered to submit a request to test the Corsair Vengeance Pro RGB 3200/3000/2666 MHz RAM on the same hardware setup as I have used and see if they can determine if the RAM should work with the motherboard or if there is a reason why it will not.