Author: parsecSubject: X99 (Taichi) - only seeing 48 of 64GB installed
Posted: 27 Dec 2016 at 10:32am
I discovered something about this model of memory that I will discuss later, but first...
Have you run the memory at stock/Auto speed, which is 2400? If not, or if you have and are trying to use it at 3000, you need to get all of it running at its stock speed, 2400. You need to see if the CPU/memory controller, memory, and board together as a system can work with your memory at its stock speed. If it can't then something is not right and you'll need to diagnose it from there. If all your memory works fine at it stock 2400 speed, then you can move on from there to a higher memory speed.
FYI, all X99 HEDT processors like yours have their memory controller, which is part of the CPU itself, rated up to a speed of 2400.
Speeds above 2400 are a memory over clock, and at best may need some work to achieve, and at worst may never be reached.
That means put all four DIMMs in the '1' slots only, A1, B1, C1, and D1. Be sure to use those slots, which are the closest ones to the CPU socket, in each of the four channels.
Then clear the UEFI/BIOS, which you can easily do using the CLR CMOS button on the board's IO panel. You must have the PSU off and unplugged from AC power when you use the CLR CMOS button.
DO NOT skip clearing the UEFI/BIOS step,
you MUST do this if you are serious about solving the problem.
When you clear the UEFI/BIOS, all the options will be reset to their default values. We want that for the memory, but if you have any other necessary settings, like RAID for the SATA mode (if you use it), you'll need to reset those again. That's normal after clearing the UEFI/BIOS.
It looks like from you pictures that you are using the EZ Mode of the UEFI/BIOS. You need to use the Advanced screens, so do that. There is more than one reason for this.
I want you to set an option only available in the Advanced UEFI screens, the
DRAM Configuration screen, found in the
OC Tweaker screen. In the
DRAM Configuration screen, way down at the bottom (scroll down) find the
MRC Fast Boot option. Set it to
Disabled.
Below that option, find the
Memory Test option, and set it to
Enabled. Setting these two options will cause what is called "Memory Training" to occur, which helps when using large amounts of memory as you are.
You should also check the
DRAM Voltage option, in the
OC Tweaker,
Voltage Configuration screen. That should be set to at least 1.2V, when the memory is at 2400 speed.
Question for you, have you installed Windows yet on this PC? Or are you simply using the UEFI/BIOS to look at the memory, etc?
As I alluded to at the beginning of my post, a review of this memory I found noted that when setting it to a speed of 3000 with the XMP2 profile, the XMP2 profile sets the BCLK to 125MHz, from the standard 100MHz. That change of the BCLK speed also affects the CPU speed, and causes a CPU over clock. For the standard 3.4GHz base speed of your CPU, that BCLK speed results in a CPU speed of 4.250GHz, and standard Turbo speed of 4.5GHz. That will happen when using one DIMM, or all four at the XMP2 speed of 3000.
http://www.hardwaresecrets.com/kingston-hyperx-predator-ddr4-3000-64-gib-memory-kit-review/4/Which is why I'm wondering if you actually can run Windows at a CPU OC of that speed. Or was the review done with an earlier version of your memory, which no longer sets the BCLK to 125MHz. You need to verify if that happens or not. The BCLK frequency will be shown in the main OC Tweaker screen, and in the DRAM Configuration screen.
I've noticed when using the System Browser tool, it can take a while before all the memory is detected after the tool is started. You may even see "Detecting" when you hover the mouse pointer over the memory slots. Yes, a DIMM will appear in red when the mouse pointer is over that DIMM, that is not abnormal.
Racin wrote: