AMD Smart Access Memory Not Available | Fix In 10 Min

That “Not Available” label is annoying because it feels like you’re locked out of a feature you paid for. In most builds, nothing is failing. One prerequisite is blocking the toggle, so AMD Software won’t even show an on/off switch.

This guide walks you through the fastest path that actually changes the status: confirm your parts are eligible, set the right BIOS switches, make sure Windows is installed in UEFI mode, then confirm the result inside Adrenalin.

What “Not Available” Means In AMD Software

AMD Smart Access Memory (SAM) is AMD’s label for the PCIe Resizable BAR feature on Radeon systems. When it’s active, the CPU can map a larger window of the GPU’s VRAM, which can help in some games and workloads.

In AMD Software: Adrenalin Edition, you’ll usually see one of these states:

• Enabled — Resizable BAR is active at the platform level and Adrenalin is using it.
• Disabled — The platform can use it, yet the toggle is off in Adrenalin.
• Not Available — One or more prerequisites are missing, so Adrenalin hides the toggle.

“Not Available” is a gate, not a diagnosis. Fix the gate and the status changes, often after a single reboot.

AMD Smart Access Memory Not Available On Your PC

Start with a quick eligibility check. If the platform can’t expose Resizable BAR, no driver reinstall will make the switch appear.

In general, you need a modern Radeon GPU, a platform that can run Resizable BAR, and firmware that actually includes the setting. Desktops are usually straightforward. Laptops and prebuilts can be hit-or-miss because the vendor controls which firmware options exist.

Fast Compatibility Check

• Confirm the GPU model — Device Manager → Display adapters, note the exact Radeon name.
• Confirm the CPU model — Task Manager → Performance → CPU, note the CPU name and series.
• Confirm the motherboard or system model — Run msinfo32 and note BaseBoard Product and System Model.
• Check BIOS age — If your BIOS is old, Resizable BAR options may not exist yet.

Common “Eligible” Patterns

Most Radeon RX 5000-series and newer desktop GPUs are commonly paired with platforms that can expose Resizable BAR. Many Ryzen 3000-series and newer desktop CPUs are also common matches, as long as the board BIOS is recent.

If you’re on a laptop or a prebuilt, eligibility can still be blocked by vendor firmware choices. That doesn’t mean the GPU can’t do it, it means the vendor may not expose the needed switches for that model.

Hardware And Firmware Prerequisites Before You Change Anything

Before you start flipping settings, get a clear picture of what you’re aiming for. SAM is usually “Not Available” for one of three reasons: the platform isn’t eligible, the BIOS settings aren’t correct, or Windows is installed in legacy boot mode.

Item	What To Check	What It Affects
GPU	Radeon RX 5000-series or newer	Provides the Resizable BAR capability
Platform	Modern desktop chipset and recent CPU generation	Allows large BAR mapping to be exposed to the OS
BIOS	Latest stable BIOS from the board or system vendor	Adds Resizable BAR options and fixes quirks
Boot Mode	Windows installed as UEFI on a GPT disk	Needed for the firmware memory map Resizable BAR relies on

If your Windows install is legacy (MBR/Legacy BIOS Mode), you can set every BIOS toggle and still get “Not Available.” That’s why this guide checks boot mode early, not at the end.

BIOS Settings That Usually Make SAM Appear

BIOS menus vary by brand, yet the same three switches show up across most boards: Above 4G decoding, Resizable BAR, and CSM set to off. Get those right first, then worry about everything else.

Update BIOS First

Resizable BAR settings were added and refined across many BIOS releases. A newer BIOS can change “Not Available” to “Disabled” without any other work.

• Download the latest stable BIOS — Use the board or system vendor download page for your exact model.
• Use the BIOS flash tool — Flash from within BIOS (brand tools vary by vendor).
• Load defaults after flashing — Save, reboot, then go back into BIOS to set the Resizable BAR switches.

Enable The Three Core Switches

• Enable Above 4G Decoding — Often under PCIe, Advanced, or AMD CBS menus.
• Enable Resizable BAR — Sometimes shown as “Re-Size BAR” or “Resizable BAR.”
• Disable CSM — Set CSM to Disabled so the system boots in full UEFI mode.

Quick BIOS Pitfalls That Waste Time

These are the small snags that keep the status stuck even when you think you did everything right.

• Use the primary x16 slot — Put the GPU in the top PCIe x16 slot tied to the CPU.
• Set PCIe mode back to Auto — If you forced Gen 3 or Gen 4, use Auto while testing.
• Save and reboot twice — Some boards apply resource-map changes cleanly after two boots.

Once you’ve set those switches, boot into Windows and check Adrenalin again. If it changes from “Not Available” to “Disabled,” you’re past the hard gate.

Windows Setup Checks That Keep The Feature Hidden

Windows boot mode is the biggest silent blocker. You can enable Above 4G decoding and Resizable BAR in BIOS, then still see “Not Available” if Windows is installed in legacy mode.

Confirm UEFI Boot And GPT Disk

• Check BIOS Mode — Press Win + R, type msinfo32, then check “BIOS Mode.” It should say UEFI.
• Check the system disk style — Open Disk Management → right-click Disk 0 → Properties → Volumes → “Partition style” should be GPT.

Fix Legacy Boot The Clean Way

If BIOS Mode says Legacy, SAM may stay “Not Available” even with the correct BIOS settings. A fresh Windows install in UEFI mode is the cleanest fix, since it resets the boot chain and the device resource map in one go.

• Back up your files — Copy anything you need off the system drive.
• Create a UEFI installer — Use the Windows Media Creation Tool on a USB drive.
• Boot the USB in UEFI mode — The boot menu often shows two entries; pick the one labeled UEFI.
• Install to a GPT disk — Delete old partitions during setup, then install to the unallocated space.

Install Chipset Drivers Before GPU Drivers

After a fresh install, install chipset drivers first. It helps Windows enumerate the platform devices cleanly, then the GPU driver lands on top of a stable base.

• Install the chipset package — Use AMD’s chipset driver page for your socket and chipset.
• Reboot once — Let Windows rebuild device resources.
• Install Adrenalin — Use a current recommended driver branch for your GPU.

Device Manager “Large Memory Range” Check

This check is handy because it doesn’t rely on Adrenalin’s UI. When Resizable BAR is active, Windows often lists a “Large Memory Range” resource on the GPU device.

• Open GPU properties — Device Manager → Display adapters → your Radeon → Properties.
• Open the Resources tab — Scan for “Large Memory Range.”
• Re-check BIOS if it’s missing — Above 4G decoding, Resizable BAR, and CSM are the usual culprits.

If “Large Memory Range” is present, Windows is seeing the platform feature. At that point, a stuck “Not Available” label is more likely an Adrenalin state issue, a vendor firmware limit, or a graphics-mode constraint on a laptop.

Confirm It In Adrenalin And Test It The Right Way

Adrenalin has moved the SAM status around across releases. Use these two paths to find it, then confirm it says Enabled or Disabled, not “Not Available.”

Find The Status In Performance

• Open AMD Software — Right-click the desktop, open AMD Software: Adrenalin Edition.
• Open Performance — Go to the Performance tab.
• Open Tuning — Find the Tuning area and locate Smart Access Memory status.

Find The Status In Graphics Settings

• Open Settings — Click the gear icon in AMD Software.
• Open Graphics — Go to the Graphics section.
• Read the SAM line — It should show Enabled or Disabled when the platform is ready.

Do A Simple Before-And-After Test

SAM gains vary by game and by scene. Use a repeatable test so you’re not guessing.

• Pick a repeatable scene — Use a built-in benchmark or a fixed save point.
• Run two passes — Same settings, same resolution, same driver, same game version.
• Watch frame pacing — Smoothness can change even when average FPS barely moves.

If the toggle is available and you can switch it on and off, the core problem is solved. At that point you’re tuning, not troubleshooting.

If It Still Says Not Available After All That

If the status still won’t change, treat it like a conflict you need to isolate. The quickest way is to strip your configuration back to the minimum and add extras later.

Do A Minimal BIOS Pass

• Clear CMOS — Use the board jumper or button, then boot into BIOS.
• Load defaults — Save and reboot once.
• Change only the three switches — Above 4G decoding on, Resizable BAR on, CSM off.
• Boot Windows and check Adrenalin — Confirm the status before enabling RAM tuning or CPU tweaks.

Prebuilt And Laptop Limits

Some laptops only show SAM when the system is in a dGPU-only mode. Some prebuilts hide PCIe options entirely. In those cases, the vendor decides what firmware features are exposed.

• Try a dGPU-only mode — If your laptop has a MUX switch or vendor GPU mode setting, set dGPU-only and reboot.
• Update with vendor tools — Use the laptop or prebuilt vendor updater for BIOS and firmware.
• Check vendor BIOS notes — Scan the release notes for Resizable BAR or Smart Access Memory being added.

Clean Reinstall The GPU Driver

Driver state can also keep the UI stuck. A clean reinstall is a fast reset when the platform side is already correct.

• Remove the current driver — Use AMD Cleanup Utility, then reboot.
• Install a fresh Adrenalin package — Install, then reboot again.
• Stop driver swapping — After install, check that Windows Update didn’t replace the Radeon driver.

If you’re seeing the exact message amd smart access memory not available, keep your first checks simple: BIOS mode is UEFI, CSM is off, Above 4G decoding is on, and Resizable BAR is on. Those four items solve the bulk of cases.

If the message amd smart access memory not available returns after a BIOS update or a Windows reinstall, re-check boot mode and BIOS switches first, then confirm “Large Memory Range” in Device Manager. That sequence saves time and keeps you out of reinstall loops.