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X99 Taichi only 48GB detected, 64GB installed
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harsham05 View Drop Down
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    Posted: 30 Sep 2016 at 1:39am
On my X99 Taichi, I have 64 GB of memory Installed on all 8 slots of the motherboard.

The BIOS detects only 48GB in Tri channel mode. Updating the BIOS to 1.40 detected only 48GB DDR4.

The RAM works fine, I checked each stick of the RAM individually using the same slots on the motherboard (A1-B1-C1-D1).

Is there any BIOS setting that will allow me to detect all 64 GB memory???  Will a future BIOS update detect all 64 GB?

I made a mistake of NOT using Corsair memory finder before buying the RAM, for compatibility with X99 Taichi. Looks like its not officially supported. 

CPU: Intel Core i7 6800K
RAM: Corsair Vengeance LPX 64GB (8 x 8GB) DDR4 DRAM 2133MHz (PC4-17000) C13 


Thank you!
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wardog View Drop Down
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Points: 6447 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wardog Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 2016 at 4:54am
What is the memory p/n ?
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harsham05 View Drop Down
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I was able to get all 64GB detected by slowing the CAS latency from C13 to C16   :)

Hopefully Asrock will support C13 in a future BIOS update !!!!

@wardog Corsair CMK64GX4M8A2133C13




Edited by harsham05 - 30 Sep 2016 at 5:12am
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parsec View Drop Down
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Points: 4996 		Post Options Post Options   Thanks (0) Thanks(0)   Quote parsec Quote  Post ReplyReply Direct Link To This Post Posted: 30 Sep 2016 at 10:07am
Originally posted by harsham05 harsham05 wrote:

I was able to get all 64GB detected by slowing the CAS latency from C13 to C16   :)

Hopefully Asrock will support C13 in a future BIOS update !!!!

@wardog Corsair CMK64GX4M8A2133C13




Corsair markets that memory as compatible with X99 systems, so it should work with any of them.

The memory controller is part of the CPU, the only thing the board needs is a compatible UEFI/BIOS.

Did you try increasing the DRAM voltage with all that memory? Increasing the VCCIO and VCCSA offset voltages will help with "missing" memory. That's what happens when the memory controller cannot handle the load of all that memory, eight DIMMs is a lot to deal with.

Did you compare the actual DRAM voltage with the UEFI DRAM voltage setting?
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p4f View Drop Down
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Points: 4 		Post Options Post Options   Thanks (0) Thanks(0)   Quote p4f Quote  Post ReplyReply Direct Link To This Post Posted: 02 Oct 2016 at 8:48am
Originally posted by harsham05 harsham05 wrote:

I made a mistake of NOT using Corsair memory finder before buying the RAM, for compatibility with X99 Taichi. Looks like its not officially supported. 


Would not help anyway. X99 Taichi is not listed in the Corsair memory finder.


Edited by p4f - 02 Oct 2016 at 8:48am
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