Asus H170M-E D3 - Upgraded to Kaby Lake. OS and UEFI sees only 8GB of 16GB

[nicolaevladescu]

Hello.

I recently upgraded my CPU to Intel i7-7700 from Intel i3-6100

I upgraded the firmware to the latest version ( 2001 ) that introduces support for Kaby Lake CPUs on my MB: Asus H170M-E D3

I have 2 kits of: https://www.amazon.com/Kingston-Technology-1600MHz-Desktop-HX316LC10FBK2/dp/B014R8J4P2

In total 16GB ( 2 dual channels, 4 DIMMs ).

So after i booted with the new CPU, in the POST boot screen it could see 16GB, but in the UEFI interface only 8GB is listed, also in Windows 10 64bit pro.

Using Speecy in Windows i can see 16GB, only UEFI and Windows see 8GB.

I can also see all the DIMMs plugged in and reporting voltages and temps correctly.

I got curious and mounted the i3-6100 back and the problem was gone, i could see all 16GB everywhere ( POST screen, UEFI, Windows).

So i am guessing it's an ASUS firmware bug, i'm sure they did not test this setup with DDR3L and Kaby Lake on this board.

My question is, does anybody have this issue, using an ASUS H170-E D3 board, with DDR3L and and a Kaby Lake CPU installed?

I would like to know if it's an isolated case, at this point i don't want to do anymore digging or part replacement or sending any parts to warranty, since i'm pretty sure it's a firmware issue and i would be wasting my time.

Thank you.

 

[Calvin7]

Memory manufacturers guarantee the rated speeds of any memory to be obtainable only in the kit it is sold in. If you are adding an additional set of memory, the memory may not work at all or may be unable to operate at rated specifications. You will need to relax the timings and/or frequencies in order to get two sets of memory to work. Another option you may need to do is increase the dram voltages or reducing the CPU multiplier.

 

[nicolaevladescu]

Memory manufacturers guarantee the rated speeds of any memory to be obtainable only in the kit it is sold in. If you are adding an additional set of memory, the memory may not work at all or may be unable to operate at rated specifications. You will need to relax the timings and/or frequencies in order to get two sets of memory to work. Another option you may need to do is increase the dram voltages or reducing the CPU multiplier.

Hello and thanks for the reply.

I tried your suggestions by setting both the frequency to 1333 and the latency to 11-11-30.

I cannot increase the voltage since the processor can handle at max 1.35V.

As for the CPU multipler i'm not sure how this works on Asus UEFI, it's very strange.

I'm thinking at upgrading to DDR4, do you think i will encounter the same problem?

UPDATE: see the message below

 

[nicolaevladescu]

Problem was solved by ASUS, my hunch was correct.

As to H170M-E D3 BIOS 2001 Update, support for Kaby Lake was added, and my issues with DDR3L, 2 kits each in it's own dual channel popped up ( 16GB total). The system could see and use only half of ram ( 8GB ).

As to H170M-E D3 BIOS 2202 Update the above issue was fixed.

Thanks, i hope this helps other people.