The quickest way to check your RAM speed
On Windows, open Task Manager by pressing Ctrl+Shift+Esc, click the Performance tab, then select Memory on the left. You will see "Speed" listed with a number like 3200 MHz or 4800 MHz — that is your RAM speed right now.
On Mac, click the Apple menu, select About This Mac, then click Memory. You will see the speed listed as something like "2400 MHz" or "5600 MHz" next to each memory module.
Both methods take about 30 seconds and show you the actual speed your RAM is operating at in this moment. This is the number that matters most if you are trying to understand your computer's performance.
Key Takeaways
- Windows Task Manager shows your RAM speed under Performance > Memory, listed in MHz.
- Mac users find RAM speed in About This Mac > Memory, also shown in MHz.
- The speed you see in these tools is what your RAM is actually running at right now, which may be lower than its rated maximum if your system has power-saving features enabled.
- RAM speed affects how fast your computer processes data, but it is only one part of overall system performance.
Why RAM speed matters, and why it might not be what you expect
RAM speed is measured in megahertz (MHz) — the number of times per second the memory can send or receive data. A stick rated for 3200 MHz can theoretically handle 3.2 billion operations per second. Higher speeds mean data moves faster between your RAM and your processor, which can make your computer feel snappier when you are running many programs at once or working with large files.
The speed you see in Task Manager or About This Mac might be lower than the speed printed on the box your RAM came in. This happens because many computers automatically slow down RAM to save power when you are not doing demanding work. If you see 2400 MHz but your RAM is rated for 3200 MHz, your system is running in a power-saving mode. This is normal and intentional.
If you want to know the maximum speed your RAM is capable of, you need to check a different place — either the documentation that came with your computer or a system information tool that shows hardware specifications rather than current performance.
Finding your RAM's maximum rated speed on Windows
Task Manager shows what your RAM is doing right now, but not what it is capable of. To see the rated maximum speed, use a free tool called CPU-Z, made by CPUID. read it from cpuid.com, run the installer, then open the program and click the Memory tab. You will see both the current speed and the rated speed listed separately.
Another option is to check Windows directly without downloading anything. Press Windows key + R, type msinfo32, and press Enter. In the System Information window, scroll down to find "System Summary" and look for anything labeled "Memory" or "RAM" — though this method is less reliable and may not show speed information at all.
The simplest approach if you know when you bought your computer: look up your exact model on the manufacturer's website (Dell, HP, Lenovo, Asus, etc.) and find the specifications sheet. It will list the RAM speed as part of the technical details.
Finding your RAM's maximum rated speed on Mac
The About This Mac window shows current speed, not maximum rated speed. To find what your RAM is capable of, click the Apple menu, select System Report (or System Information on older Macs), then click Memory on the left sidebar. This view shows more detailed information, including the type of RAM — DDR4, DDR5, LPDDR5, etc. — which tells you the speed category, though not the exact rated speed.
For the precise rated speed, check your Mac's original purchase documentation or the Apple support page for your specific model. You can also look up your Mac's model identifier (found in About This Mac) on Apple's technical specifications pages, which list RAM speed as part of the standard configuration.
If you upgraded your RAM yourself, the speed should be printed on the memory modules themselves or on the packaging they came in. If you cannot find that information, you can search for your Mac model plus "RAM specifications" to find what speeds Apple supports for your machine.
What the different RAM speeds actually mean
RAM speeds come in standard categories: DDR4 typically ranges from 2133 MHz to 3600 MHz, while DDR5 (newer) ranges from 4800 MHz to 6400 MHz or higher. The "DDR" part means Double Data Rate — the RAM transfers data twice per clock cycle, so a 3200 MHz DDR4 stick actually moves data at an effective rate of 6400 million transfers per second. This is why the numbers seem high but are not directly comparable across DDR generations.
For most everyday use — email, web browsing, document editing, video calls — the difference between 2400 MHz and 3600 MHz is not noticeable. The speed matters more if you are doing video editing, 3D rendering, data analysis, or gaming at high frame rates. Even then, the amount of RAM (measured in gigabytes) usually matters more than the speed.
If you are shopping for a new computer or RAM upgrade, matching your speed to what your processor supports is more important than chasing the highest number. A processor designed for 3200 MHz RAM will not run 4800 MHz RAM any faster than 3200 MHz, so you would be paying extra for speed you cannot use.
When you might need to change your RAM speed settings
Most computers come with RAM speed already set correctly in the BIOS (the firmware that runs before Windows or Mac starts up). You should not need to change anything. However, if you upgraded your RAM and your computer is not recognizing the new speed, or if you are building a gaming or workstation computer and want to squeeze out extra performance, you may need to adjust BIOS settings.
Changing BIOS settings is not dangerous if you follow the correct steps, but it is also not necessary for normal use. If you decide to do this, look up a guide specific to your motherboard model, because the steps and menu names vary widely. On Mac, you generally cannot change RAM speed settings at all — the system handles this automatically.
If your RAM is running slower than rated and you want it to run faster, check your computer's power settings first. On Windows, go to Settings > System > Power & sleep > Additional power settings and switch from "Power saver" to "Balanced" or "High performance." This often allows your RAM to run at full speed.
Frequently Asked Questions
Can I upgrade my RAM speed by changing settings?
Not really. Your RAM has a physical maximum speed built into the chip. You can enable power-saving features to slow it down, or adjust BIOS settings to let it run at its rated speed if it is being held back, but you cannot make DDR4-3200 RAM run at DDR5 speeds. If you need faster RAM, you have to buy new modules.
Does faster RAM make my computer faster?
It can, but usually not by much for everyday tasks. The difference between 2400 MHz and 3600 MHz RAM is noticeable mainly in video editing, 3D rendering, or competitive gaming. For browsing, email, and office work, you will not feel a difference. Having enough RAM (16 GB or more) matters far more than speed.
Why is my RAM running slower than what it says on the box?
Your computer is likely using a power-saving mode. Check your Windows power settings and switch from "Power saver" to "Balanced" or "High performance." You can also check your BIOS to see if RAM speed is being limited there, though this is less common on newer computers.
Is it safe to check my RAM speed?
Yes, completely safe. Looking at Task Manager, About This Mac, or downloading CPU-Z will not change anything or harm your computer. These are read-only tools that just show you information. Changing BIOS settings is also safe if you follow instructions carefully, but it is not necessary just to check your speed.
What RAM speed should I buy for a new computer?
Match the speed to what your processor supports. Check your processor's specifications on the manufacturer's website (Intel or AMD for Windows, Apple for Mac) to see the recommended RAM speed. Buying faster RAM than your processor supports wastes money because it will run at the slower supported speed.