[Problem] RAM Upgrade of Clevo P751TM1-G (Z370): 64GB > 96/128GB

BIOS/UEFI Modding BIOS Modding Guides and Problems
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Hi everyone!

I was not sure in which category I should create this topic, but among the listed categories this seems to be the closest, given that the issue is likely to do something with BIOS.

I ended up in a very frustrating situation.

My notebook PC is Clevo P751TM1-G (similar to P775TM1 but just smaller, 15.6"), with Z370 chipset, Prema BIOS, i9-9900K, RTX-2080, 4 RAM slots in dual-channel.
Very nice powerful machine that I really enjoy having.

I realized that 64GB RAM is no longer enough for my needs, and decided to get 2 x 32GB modules and upgrade to 96GB RAM, with the plan to make another upgrade to 128GB RAM in the future.

I ordered 2 x 32GB RAM (Kingston Impact) with the plan to mix them with the 2 x 16GB modules that I already have (also Kingston Impact).

The frustration arrived together with the 32GB modules.

After installing the RAM and booting the OS, what I saw was cetrainly not what I expected.
Only 64GB turned out to be visible, both in the BIOS and in the OS.
The Windows Resource Monitor shows that installed RAM is 96GB, total is 64GB, and hardware-reserved is 32GB.

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I’ve tried all possible variations of RAM modules vs. slots, and always getting the same result.

Have I missed something? Is there something I should change or activate in BIOS, or boot into UEFI-shell change some BIOS variable, or smth else?

32GB modules certainly work: I removed the 2x16GB modules and left just the 2x32GB modules, and had 64GB of RAM in the system.
So I assume in this 2x16GB+2x32GB setup this hardware-supported non-usable RAM is the 2x16GB (otherwise if it was the 2x32GB, then the hardware-supported non-usable RAM would be 64GB instead of 32GB).

I would really, really not like to end up in a double-frustrating situation:
the situation that I made this expensive RAM order for nothing,
and the situation that this awesome power-horse PC it doomed to have maximum 64GB RAM.

I’m very sure that up-to-128GB RAM is a real thing and is very possible in Clevo P751TM1 / P775TM1, here are some few links I’ve found before ordering the RAM modules:

I just don’t know how / what exactly I need to do.

I really hope someone could help and give the right advice/instructions to get it to work.


Edit by Fernando: Thread moved into the “BIOS Problems” Forum Category and title customized

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@User_77
Welcome to the Win-Raid Forum!
As you have seen, I have moved your help request into the “BIOS Modding Problems” Forum Category and tried to make your chosen title as short and understandable as possible.
If you should not agree with my action, feel free to change the thread title by editing your initial post.
Good luck!

1 Like
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But they are really present right… windows see’s 98Gb, does HWinfo or other tool see’s also the modules? So its not really all for nothing.
Now is this Clevo design or bios settings by the OEM…
Latest bios/ec avaiable installed?
(P7xxTM(G)_B10729) BIOS Version 1.07.29 (2020-06-24)

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Yes,
Well, nothing sees 96GB except for the Windows Resource Manager, which reports 96GB installed, 64GB total, 32GB hardware-reserved.. (like in the screenshot in the first post)
The BIOS version is 1.07.20 (2019-10-01), but it’s vendor-customized Prema BIOS (advanced version of BIOS), not the standard Clevo BIOS.
As I’ve seen in this topic, BIOS v1.07.29 doesn’t fix this situation anyway.

UPDATE:
In addition to the Windows Resource Manager, they all (2x16GB+2x32GB) are visible in Aida64 and CPU-Z under their SPD tabs when selecting a single module (can see the parameters of any of the 4 installed).
Also, HWiNFO64 System Summary shows 96GB RAM.