HP Pavilion 15-ec0xxx (Ryzen 5 3550H) Sticking 10.1GB RAM as "Hardware Reserved" - Both Sticks Functional

Question

Hello,

I am facing a severe memory allocation issue on my HP Pavilion Gaming Laptop 15-ec0xxx equipped with an AMD Ryzen 5 3550H (Radeon Vega Mobile Graphics) and an Nvidia GTX 1650.

The laptop has 16.0 GB of RAM physically installed (two 8GB sticks). However, Windows 11 reports only 5.88 GB usable. In Task Manager, a massive 10.1 GB is flagged as "Hardware Reserved".

This behavior persists across multiple operating systems (originally found on Linux Mint, and still present after a completely clean installation of Windows 11 Home).

Hardware & Software Troubleshooting Already Completed:

Physical Inspection: Opened the laptop chassis, completely removed both RAM modules, cleaned the contacts, and physically swapped their slot positions. The system still detects 16GB total but retains the exact 10.1GB reservation.

OS Configuration: Checked msconfig -> Boot Advanced Options. "Maximum memory" is completely unchecked.

Firmware Limitations: The HP consumer BIOS utility does not provide an option to modify UMA Frame Buffer / Integrated Graphics Share Memory sizes manually.

BIOS Utility Status: Attempted to use the official HP installer tool to update/re-flash the BIOS firmware, but it reports that the current motherboard firmware on the machine is already newer than the executable package online (blocking a manual override).

Hard Reset: Performed a full 35-second physical power button drain to wipe the motherboard's temporary RTC/ACPI memory mapping tables, but the reservation limits remain locked.

Because both modules are confirmed functional by the system topology scanner, this appears to be an unresolvable UEFI/ACPI memory table conflict between this particular HP motherboard revision and the internal AMD memory controller.

How can I force Windows or the underlying firmware map to release this 10.1GB hardware reservation? Any advanced registry overrides or tool deployment advice would be highly appreciated.

Answer 1

Hi GK BHANU PRAKASH

You made clear it isn't a Windows issue when you found the same with another OS.

I suggest you contact HP support.

Answer 2

The problem with Hardware Reserved RAM does not indicate a problem with your two sticks of RAM, this is caused by the Integrated AMD graphics on your processor, Windows is setting aside too much shared RAM for the integrated graphics.

1

Open Device Manager, expand the Display Adapters section.

Right click and disable (not uninstall) the AMD Vega graphics device, then restart (not shut down) your laptop to flush out your RAM to test if that resolves the problem.

2

If that does not resolve the problem, boot your laptop into BIOS, is there an option provided in there to disable the integrated AMD graphics and just use the dedicated Nvidia graphics.

3

If that setting does not exist, in BIOS is there any option for Graphics Settings in the Advanced, Chipset, or BIOS Features tab.

If so, look for VRAM Setting - UMA Frame Buffer Size, Integrated Graphics Configuration, Shared Memory, or DVMT.

If you find any of those settings you may be able to manually set the used shared memory by the AMD integrated graphics.

Answer 3

Windows reports “Hardware reserved” memory when RAM is blocked from use by the OS because firmware, devices, or drivers have claimed it. This memory is not available to Windows or applications.

From the available information, there is no supported way in Windows to “force release” hardware-reserved memory. The reservation is determined by firmware/ACPI and hardware (including integrated graphics and other devices), not by a Windows registry setting. Windows only reports what is left as usable after those reservations.

Relevant points from the context:

• Hardware-reserved memory is explicitly defined as RAM that is reserved by hardware, drivers, or firmware and is not available to Windows or user applications. Reducing this reserved memory improves responsiveness, but it is controlled at the firmware/hardware level, not by Windows configuration.
• Task Manager and similar tools may show confusing or even incorrect memory details; Resource Monitor is recommended for accurate reporting of reserved memory, but this does not change the reservation itself.
• Windows memory management and virtual memory operate on whatever physical RAM remains after hardware reservations. There is no documented registry override to reclaim memory that firmware has marked as reserved.

Given that:

• The same large reservation appears across different OS installations.
• Both RAM sticks are detected and functional.
• BIOS does not expose options to adjust UMA/iGPU memory or other advanced mapping.

This strongly indicates a platform/firmware or hardware issue rather than a Windows configuration problem. On such systems, the only practical ways to reduce hardware-reserved memory are:

1. Firmware/BIOS update or fix from the OEM (HP) that corrects the ACPI/memory map.
2. Hardware repair or replacement (motherboard or related components) if the firmware is already current and behaving incorrectly.

Windows itself does not provide a supported mechanism to override the UEFI/ACPI memory map or to reclaim hardware-reserved regions via registry edits or tools.

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References:

• Hardware Reserved Memory Test
• Task Manager may display incorrect memory information
• RAM, virtual memory, pagefile, and memory management in Windows
• Results for the Memory Footprint assessment