Can't OC Corsair RAM

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Soundboard Nightmare

Commendable
May 23, 2016
7
0
1,510
Hello,

First of all, thank you for taking your time to read and respond.

Here is my predicament. I am not able to get past 2133MHz with my RAM, even though they are rated for 3000MHz. I have 4 Corsair RAM sticks, all 8GB and all 3000MHz speed. Two of the four are model CMK16GX4M2B3000C15 and the other two are model CMK16GX4M2C3000C15. The only difference is two have RGB LED heatsinks and the other two do not. I have them plugged in to the correct slots for dual channel. I have tried using XMP in my BIOS which does not get past 2133MHz no matter what I set it at. I have tried setting the voltage, timings, and speed manually with XMP disabled and enabled with no luck. I have updated my BIOS to the latest firmware and I have updated my chipset to the latest drivers. Not sure what else I can do to get this working.

Note: CPU overclocking works without a problem

Hardware
CPU: Ryzen 7 1700
RAM: 2x8GB CMK16GX4M2B3000C15 & 2x8GB CMK16GX4M2C3000C15
MOBO: Gigabyte AB350 Gaming 3 -- BIOS Version: F10
GPU: EVGA GTX 1070

Software
Windows 10 Pro 64bit
Corsair Link 4.9.4.28 (I think this is only used for setting fan speeds and such, but I am wondering if this is causing my problems?)
EVGA Precision XOC 64bit 6.1.2

Please let me know if there is any other information that would be helpful. I have done some research and noticed other people have had similar problems with Corsair memory/this Gigabyte mobo when it comes to overclocking memory. I haven't been able to find a solid solution. Thanks again for taking your time to assist!
 
Solution
MeanMachine41
XMP (Extended Memory Profile) developed by Intel is a table with SPD values for one click overclocking and recognized in Bios, Overclocking your RAM outside the standards is using DRAM Timing and Voltage control to loosen or tighten these parameters for better stability.

With Ryzen the equivalent to XMP is D.O.C.P. so try that. During the post cycle, Bios will attempt various training codes in an attempt to configure the most stable settings for RAM. (hence why the system may reboot a few times)
CPUz will tell you if indeed your RAM has an XMP profile and they probably do. Obtain these values, write them down and give them a try manually.

Unless you have a real need for OC RAM then 16GB is plenty enough for gaming. If your need is...
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MeanMachine41

MeanMachine41

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May 8, 2014
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Hi Soundboard Nightmare :)

The Gigabyte AB350 Gaming 3 officially supports up to 2667Mhz and anything above that are considered 'OC' RAM and 32MB at 3000MHz is quite a bit to ask of the IMC.
Also it is never a good idea to mix RAM kits even of the same spec due to minor variations in Latency and that's why RAM manufacturers bin their modules to ensure conformity.

An XMP profile would not work with 'OC' RAM as it not the JDEC standard so your system Bios would default to the lower 2133MHz. Playing around with DRAM Timing Control and Voltage can work but no guarantee and it can be a frustrating exercise.
Do you have a need for 32MB and can you attain stability with 16MB from the same kit.?
 
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S

Soundboard Nightmare

Commendable
May 23, 2016
7
0
1,510


Hi MeanMachine41,

Thanks for a quick reply! No, I can definitely manage with 16GB of RAM. I had the other two sticks, so I figured why not!

I thought the XMP profile was OCing, am I not correct with that assumption? If we can get two sticks at 2667, then that would be awesome! Would I just need to remove the other two and turn XMP to see if it works?
 
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Calvin7

Titan
Feb 19, 2013
11,725
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Memory is guaranteed in the form it is sold and what is not guaranteed is combinations made by matching up part numbers. XMP profiles are also for the kit in the form it was sold. Other combinations can be done on a "do it yourself" compatibility testing basis. The two kits were never tested together so it is not known how they will work together if at all.

If you have no XMP profile for the desired memory speed then you can manually set the memory parameters.
 
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MeanMachine41

MeanMachine41

Judicious
May 8, 2014
5,195
336
33,390
XMP (Extended Memory Profile) developed by Intel is a table with SPD values for one click overclocking and recognized in Bios, Overclocking your RAM outside the standards is using DRAM Timing and Voltage control to loosen or tighten these parameters for better stability.

With Ryzen the equivalent to XMP is D.O.C.P. so try that. During the post cycle, Bios will attempt various training codes in an attempt to configure the most stable settings for RAM. (hence why the system may reboot a few times)
CPUz will tell you if indeed your RAM has an XMP profile and they probably do. Obtain these values, write them down and give them a try manually.

Unless you have a real need for OC RAM then 16GB is plenty enough for gaming. If your need is for large rendering or Video file editing then a single kit that have been tested and listed on the MB QVL is the way to go.
 
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Solution
S

Soundboard Nightmare

Commendable
May 23, 2016
7
0
1,510


Thanks for the reply, Calvin. I appreciate the info!
 
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S

Soundboard Nightmare

Commendable
May 23, 2016
7
0
1,510


I was actually able to get it working off of your first reply! I took 2 of the sticks out and I was able to do some loosening and then tightening on the timings for the 2 sticks I left in there, and I got it working at 2667MHz! Thanks so much again for you help, I really appreciate it!
 
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