Corsair CMK64GX4M4B3333C16 BIOS Memory Settings

[Asgaroth]

Hi All,

I have 64GB of Corsair CMK64GX4M4B3333C16 and noticed last night that it was running at 2133MHz.

I've had a read around the forums before I signed up this morning to see how to go about doing this in the BIOS. Most threads I came across mentioned that, for Dual Rank memory, the most stable setting is around the 3066MHz mark. One thread mentioned that one should use SIV to pull the SPD information and then apply the settings manually in the BIOS.

Initially, what I tried first was to go into the BIOS, set it to "Easy Mode" and then just select the XMP profile in the drop down list. This did not go as well as I had expected. System rebooted, ran for about 10 minutes, hard-locked and then booted twice before telling me I had BIOS settings issues.

I then rest to optimized defaults, went into advanced mode, then selected the DDR4-3066 memory profile setting in the drop down list for memory speed. I also set the voltage for bank AC/BD to 1.35V. I am currently running with this setting, I noticed a substantial improvement in responsiveness.

I'm just wondering if this is the right way to setup the timings for this memory, because, when I run SIV and look at the SPD timings it returns, there is no specific speed for 3066MHz, there is one that is slightly higher, and the settings listed don't quite match what is defined in the preset (as shown by CPU-Z). What is the right way to set the timings up, or am I OK with how I have currently done it?

As an aside, the memory is rated/tested at 3333MHz for the XMP setting, does anyone know if I will be able to run at this speed?

Any thoughts/tips/tricks would be much appreciated.

Cheers
Asgaroth

[spadizzle]

Your on the right track.
Memory I purchased:

Memory (RAM)
Total Size 32768 MB
Type Quad Channel (256 bit) DDR4-SDRAM
Frequency 1599.1 MHz - Ratio 1:16
Timings 18-19-19-39-58-1 (tCAS-tRC-tRP-tRAS-tCS-tCR)
Slot #1 Module Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #2 Module Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #3 Module Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #4 Module Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18

Suppose to run at 3600 stable, but I have it to get it their without the system being stable. So just running it at 3200. All the adjustments you have made, I have made also.

I imagine after the BIOS gets a little smarter, we should be in a more stable area to actually run our systems at the recommended speed.

[Asgaroth]

Thanks for the update on how you did it, I was wondering though, as, in other threads, people were recommending to put the timings in manually, I just used a preset, so I'm not sure if the timings are correct, they don't seem to match with any specific timing listed with SIV's SPD timing list.

For example, here is SIV's SPD information for one of the memory modules:



With the DDR4-3066 memory preset CPU-Z mentions the following timings:



As you can see, SIV doesn't have a SPD setting listed for the preset settings that have been applied by the BIOS.

The closest one I can see is this one (which is slightly higher):

1564.1 15 17 17 34 51 (Clock tCL tRCD tRP tRAS tRC)

I'm wondering if:
(a) Will this cause me any issues/damage?
(b) If I wanted to manually put in the listing above, how/where do I go in the BIOS to actually manually put it in (without disabling any of the CPU boosting etc).

I'm currently running BIOS 0701 which appears to be the latest listed on the ASUS support site for this motherboard.

Thanks for reading 🙂

[Ljugtomten]

Those timings (1564.1 15 17 17 34 51 (Clock tCL tRCD tRP tRAS tRC)) are the same as I am using with my Corsair 3200MHz sticks @3066MHz.

Go for those at 3066MHz 🙂
Can't remember the actual submenu, but you'll see it when you get there (you will see a long list with the DRAM timing attributes and you can enter them manually there)

DRAM overclocking is separated from CPU overclocking so you can still use CPU core boost.

[Asgaroth]

Ljugtomten wrote:
Those timings (1564.1 15 17 17 34 51 (Clock tCL tRCD tRP tRAS tRC)) are the same as I am using with my Corsair 3200MHz sticks @3066MHz.

Go for those at 3066MHz 🙂
Can't remember the actual submenu, but you'll see it when you get there (you will see a long list with the DRAM timing attributes and you can enter them manually there)

DRAM overclocking is separated from CPU overclocking so you can still use CPU core boost.

Thanks, I'll have a look around and see if I can manually set this up.

[spadizzle]

Asgaroth wrote:
Thanks, I'll have a look around and see if I can manually set this up.

Don't forget to change the DRAM voltage power, otherwise I think the system defaults to 1.2v and I believe your memory is 1.35v

Can either do it manually or just use D.O.C.P. and set the speed of the memory manually.

[Asgaroth]

OK, I've found the sub-menu (DRAM Timings), so, for anyone who wants to know how I did it in the future, here's how I did it.

[1] Set the speed from the memory preset list, in my case DDR4-3066
[2] Set the voltage for banks AC/BD to that listed in SPD, in my case 1.350v
[3] Go to DRAM Timings and fill in the value's as listed in the SPD profile closest to 3066MHz.

An I end up with the timings that better match SPD as shown by CPU-Z:



This is with ROG Zenith Extreme BIOS version 0701.

Thanks all for the help. Hopefully this helps someone else in the future.

Hopefully at some point I'll be able to run this memory at the rated 3333MHz speeds. The difference this change alone has made is HUGE for my usage profile.

Cheers
Asgaroth

[spadizzle]

So the memory I have is suppose to run at 3600. The system will post and windows will be ok, but will fail after a given amount of time. So I backed clocked it to 3333mhz and i'm running a tighter memory setting actually meant for 3200mhz. Makes no sense, but the damn thing is running great with the 3200 timings and running stable at 3333. Ran Memtest64 for a bit and some gaming.

Memory (RAM)
Total Size
32768 MB
Type
Quad Channel (256 bit) DDR4-SDRAM
Frequency
1666.3 MHz - Ratio 3:50
Timings
16-17-17-35-52-1 (tCAS-tRC-tRP-tRAS-tCS-tCR)
Slot #1 Module
Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #2 Module
Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #3 Module
Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18
Slot #4 Module
Corsair 8192 MB (DDR4-2137) - XMP 2.0 - P/N: CMK32GX4M4B3600C18


Check out CPUID's validation, that way you can easily see the memory combos you can run.

Example of mine:
XMP timings table CL-tRCD-tRP-tRAS-tRC-CR @ frequency (voltage)
XMP #1 9.0-10-10-20-30-n.a @ 899 MHz (1.350 Volts)
XMP #2 10.0-11-11-22-33-n.a @ 1000 MHz (1.350 Volts)
XMP #3 11.0-12-12-24-36-n.a @ 1100 MHz (1.350 Volts)
XMP #4 12.0-13-13-26-39-n.a @ 1200 MHz (1.350 Volts)
XMP #5 13.0-14-14-29-42-n.a @ 1300 MHz (1.350 Volts)
XMP #6 14.0-15-15-31-46-n.a @ 1400 MHz (1.350 Volts)
XMP #7 15.0-16-16-33-49-n.a @ 1500 MHz (1.350 Volts)
XMP #8 16.0-17-17-35-52-n.a @ 1600 MHz (1.350 Volts)
XMP #9 17.0-18-18-37-55-n.a @ 1699 MHz (1.350 Volts)
XMP #10 18.0-19-19-39-58-n.a @ 1798 MHz (1.350 Volts)
XMP #11 19.0-19-19-39-58-n.a @ 1798 MHz (1.350 Volts)
XMP #12 20.0-19-19-39-58-n.a @ 1798 MHz (1.350 Volts)

Anyways, I am hoping further BIOS updates will correct this eventually.

[Ljugtomten]

Those timings (1564.1 15 17 17 34 51 (Clock tCL tRCD tRP tRAS tRC)) are the same as I am using with my Corsair 3200MHz sticks @3066MHz.

Go for those at 3066MHz 🙂
Can't remember the actual submenu, but you'll see it when you get there (you will see a long list with the DRAM timing attributes and you can enter them manually there)

DRAM overclocking is separated from CPU overclocking so you can still use CPU core boost.