RAM may be running slower than it says on the box — how to check and speed it up

#ddr4 #ddr5 #xmp #expo

A DDR4 kit advertised at 3,200 often runs at 2,133 by default unless its XMP or EXPO profile is enabled.

The MakeUseOf guide covers how to check the current rate in Windows, locate the profile in BIOS, and what to expect from memory training on the first boot.

It also explains the Intel/AMD distinction and a DDR5 setting that can cause instability if old values are retained.

Why RAM doesn't always run at its advertised speed

A small chip in the memory, the SPD (Serial Presence Detect), stores information about its settings. It includes the basic JEDEC profile, which helps the memory work with different processors and motherboards, as well as the manufacturer's higher-speed profile: XMP for Intel systems or EXPO for AMD systems. Typically, the motherboard selects JEDEC first.

So, a DDR4 advertised at 3.200 MHz might run at 2.133 MHz, the usual default speed. DDR4 JEDEC profiles range from 1.600 to 3.200 MHz. DDR5 also starts at a lower speed: a kit advertised at 6.000 MHz might run at 4.800–5.200 MHz, if its profile is not enabled.

DDR4 has returned to many new PCs as the rise in DRAM prices, which it links to the surge in artificial intelligence, has made it a popular choice again, according to a MakeUseOf guide published on October 9, 2026.

How do you activate the memory profile?

During boot, press F2 or Delete to enter the BIOS. Open the overclocking section — on MSI motherboards it may be called OC and on Gigabyte motherboards it may be called Tweaker — and select the first available XMP or EXPO profile.

These profiles are technically considered overclocking, but manufacturers test and certify them. If instability occurs with an active profile, especially on a system with four RAM modules, first reduce the speed and, if necessary, the voltage.

What to expect after the change

The first boot may take a little longer because the system is doing memory training: adjusting the signals, timings, and voltages between the processor and RAM.

On DDR5, if Memory Context Restore was enabled before changing the speed, disable it. Otherwise, the computer may retain the previous settings and become unstable. It is also recommended to have the latest version of the motherboard BIOS installed, as older versions may struggle with fast memory, especially DDR5.

If you have two RAM modules on a motherboard with four slots, install them in the positions specified by the manufacturer for dual-channel operation.

Read the original English article on Hacks.gr