RAM Tester Online
See your available RAM, total memory, read and write speeds in MB/s, and browser memory usage instantly in your browser.
The TechTester RAM tester checks your computer’s memory speed and usage directly in your browser. Open this page and your available RAM, used RAM, and total system memory appear instantly using your browser’s performance APIs. Click Run Speed Test to measure your memory’s sequential read speed, sequential write speed, random access performance, and memory copy bandwidth in megabytes per second giving you a clear picture of whether your RAM is performing at its expected speed for your RAM type and frequency. This free online memory test works on Windows, Mac, Linux, and Chromebook without any software installation, USB boot disk, or account required. Results appear in under 60 seconds.
RAM Tester Online
Stress-test your browser's available memory directly in this page. No download, no iframe.
What the TechTester RAM tester shows you
The TechTester RAM tester uses browser performance APIs and JavaScript memory benchmarking to read your system memory information and measure speed. Here is what each display element shows:
Total RAM
Total system memory installed in your computer. Shown in GB. Uses navigator.deviceMemory API shows the nearest power of 2 (e.g. 8GB, 16GB, 32GB).
Available and used RAM
How much RAM is currently free versus in use. Uses performance.memory API in Chrome and Edge. Shows real-time memory pressure on your system.
Read speed (MB/s)Sequential read speed how fast your system can read data from memory in a straight line. The most important metric for general system performance. |
Write speed (MB/s)
Sequential write speed — how fast your system can write data to memory. Typically slightly lower than read speed. Important for tasks that write large amounts of data.
Random access (MB/s)
Random read speed — how fast memory handles non-sequential data access. Lower than sequential speed due to cache misses. Important for multitasking and database workloads.
Bandwidth score
A combined score based on all three speed measurements. Higher is better. Compare before and after RAM upgrades, frequency changes, or XMP/EXPO profile enabling.
What this browser RAM test can and cannot check
We believe in being completely honest about what a browser-based tool can and cannot do. Here is the full picture:
What the browser test CAN check
Total RAM installed (approximate via
navigator.deviceMemory)
Available RAM and currently used RAM (Chrome/Edge)
Memory read speed in MB/s (sequential)
Memory write speed in MB/s (sequential)
Random access memory speed in MB/s
Memory copy bandwidth in MB/s
Browser JavaScript heap size and usage
Relative performance comparison before/after changes
What requires dedicated software instead
Hardware level RAM faults and errors
ECC error detection and correction
RAM stability under extended stress testing
Memory timings: CAS latency, tRCD, tRP, tRAS
Dual channel vs single channel detection
Individual DIMM slot testing
Row hammer susceptibility
True hardware RAM latency in nanoseconds
Free tools for deeper RAM testing
If you need hardware level RAM diagnostics beyond what a browser can provide, these free tools go further:
Windows Memory Diagnostic
Search “Windows Memory Diagnostic” in the Windows Start menu. Click Restart now and check for problems. Windows will reboot, run a memory test, and report results on the next startup. This is the fastest way to check for RAM hardware faults on Windows without downloading anything.
MemTest64 by TechPowerUp
Download MemTest64 from techpowerup.com. It runs from within Windows without requiring a boot disk making it significantly more accessible than MemTest86. It tests your RAM for hardware level errors using established test patterns and is suitable for diagnosing crashes and blue screens of death.
MemTest86 (free, all platforms, most thorough)
Download MemTest86 from memtest86.com. It boots from a USB flash drive and tests RAM completely independently of the operating system giving the most thorough and accurate results. Use this if you suspect serious RAM faults causing crashes, data corruption, or system instability. The free edition is sufficient for most users.
Apple Diagnostics (built into every Mac – no download)
Shut down your Mac. For Apple Silicon Macs: hold the power button until startup options appear, then hold Command+D. For Intel Macs: hold D at startup. Apple Diagnostics runs a built-in hardware test including RAM and reports any detected issues with an error code.
How to test your RAM online
Step 1 – Open the RAM tester in Chrome or Edge
The TechTester RAM tester uses the performance.memory API for live RAM usage data, which is available in Google Chrome and Microsoft Edge. Firefox and Safari do not expose this API for privacy reasons. For the read, write, and random access speed tests, all modern browsers are supported but for total memory and usage data, Chrome or Edge is recommended.
Step 2 – Read your memory information
Your total RAM, available RAM, and currently used RAM appear automatically when the page loads no button press needed. Total RAM shows the nearest GB figure via the navigator.deviceMemory API. Available and used RAM updates in real time in Chrome and Edge, showing you current memory pressure. If you have many browser tabs, applications, or background processes running, the used RAM figure will be higher.
Step 3 – Run the speed test
Click the Run Speed Test button. The test allocates a memory buffer and performs sequential reads, sequential writes, random reads, and a memory copy operation measuring the speed of each in megabytes per second. The test takes 10 to 30 seconds depending on your system. Keep the browser tab in focus during the test background tabs receive fewer CPU and memory resources and will produce lower scores.
Step 4 – Interpret your results
Use the RAM speed reference table in Section F to understand whether your results are in the normal range for your RAM type. If your scores are significantly lower than expected, check Section G for the most common causes and fixes.
What is a good RAM speed score?
Browser-measured RAM speeds are lower than hardware-spec speeds due to JavaScript overhead. Use these ranges as reference points for browser-level RAM performance:
|
RAM type |
Typical browser read |
Typical browser write |
Verdict |
|
DDR5 (6400 + MT/s) |
25,000 – 40,000 MB/s |
20,000 – 32,000 MB/s |
Excellent |
|
DDR5 (4800 – 6000 MT/s) |
18,000 – 28,000 MB/s |
14,000 – 22,000 MB/s |
Very good |
|
DDR4 (3200 – 3600 MT/s) |
12,000 – 18,000 MB/s |
10,000 – 14,000 MB/s |
Good |
|
DDR4 (2400 – 3000 MT/s) |
8,000 – 12,000 MB/s |
6,000 – 10,000 MB/s |
Average |
|
DDR3 (1600 MT/s) |
4,000 – 7,000 MB/s |
3,000 – 5,500 MB/s |
Older RAM |
|
Integrated/shared RAM (M1/M2/M3) |
20,000 – 50,000 MB/s |
18,000 – 40,000 MB/s |
Excellent unified memory |
RAM speed lower than expected?
Fix 1 – Enable XMP or EXPO in BIOS (most impactful fix)
This is the single most common cause of low RAM speeds and affects a large percentage of gaming PCs. RAM is sold at its maximum rated speed (e.g. DDR4-3600 or DDR5-6000) but by default Windows runs RAM at the JEDEC base speed (typically DDR4-2133 or DDR5-4800) until you enable the XMP (Intel) or EXPO (AMD) profile in BIOS. If your RAM is rated for 3600 MT/s but running at 2133 MT/s, your browser speed test will score significantly lower than your RAM’s potential.
To enable XMP or EXPO: restart your computer and enter the BIOS (usually by pressing Del, F2, or F12 at startup). Find the memory or overclock section. Enable XMP (for Intel systems) or EXPO (for AMD Ryzen systems). Select the highest available profile matching your RAM’s rated speed. Save and exit. Rerun the TechTester RAM speed test to confirm the improvement.
Fix 2 – Ensure RAM is in the correct slots (dual channel)
Most motherboards support dual channel memory running two RAM sticks together for approximately double the effective memory bandwidth. However dual channel only activates when RAM sticks are installed in the correct slots. Most motherboards require sticks in slots 2 and 4 (not 1 and 2). Check your motherboard manual for the correct dual channel configuration. Incorrectly slotted RAM runs in single channel mode at roughly half the bandwidth.
Fix 3 – Close background applications
Memory intensive applications running in the background consume RAM bandwidth and reduce your benchmark scores. Before running the RAM speed test, close all other applications especially browsers with many tabs, video editing software, virtual machines, and games. The more RAM is being actively used by other processes the lower your speed test results will be.
Fix 4 – Keep the browser tab in focus during the test
Browsers deprioritise tabs that are not in focus, reducing CPU time and memory bandwidth available to them. Always keep the TechTester RAM tester tab active and in the foreground during the speed test. Do not switch to another tab or minimise the browser while the test is running.
Fix 5 – Update your motherboard BIOS and chipset drivers
Outdated BIOS firmware can cause RAM to run at suboptimal speeds or fail to apply XMP profiles correctly. Visit your motherboard manufacturer’s website and check for BIOS updates. Also update your chipset drivers from Intel or AMD’s website. These updates often include memory controller improvements that can meaningfully improve RAM bandwidth performance.
TechTester RAM tester vs other online memory tests
Other browser RAM tests – limitations
xbitlabs.com – good benchmark but no speed interpretation table
twoodo.com – RAM speed test but no memory usage display
No site explains browser vs hardware benchmark difference
No site covers XMP/EXPO fix for low speeds
No site explains dual channel RAM impact
No site guides users to deeper free OS tools
All single tool sites no mic, GPU, or keyboard testing
Developer focused language, not gamer or general user friendly
TechTester RAM tester – your advantage
Total RAM + available RAM + used RAM all shown together
Read speed + write speed + random access in one test
Plain-English speed table: what MB/s means for your RAM type
XMP/EXPO fix explained the most common cause of low scores
Dual channel slot configuration explained
Free OS tool guide: Windows Diagnostic, MemTest64, MemTest86, Apple
Honest about browser limitations builds trust
Part of TechTester hub RAM, GPU, mic, keyboard all in one place
Yes. The TechTester RAM tester checks your memory speed and usage directly in your browser. See available RAM, total RAM, read speed, write speed, and random access speed in MB/s completely free, no download, no signup. For hardware level fault detection, use the free Windows Memory Diagnostic (built into Windows) or MemTest86.
Open techtester.online/ram-tester/ in Chrome or Edge. Your total RAM appears automatically on the page using the navigator.deviceMemory API. It shows the nearest power of 2 in GB for example 8, 16, 32, or 64 GB. For the exact figure including memory frequency and type, check Windows Settings, then System, then About on Windows, or System Information on Mac.
Good browser level read speeds vary by RAM type. DDR4-3200 typically shows 12,000 to 18,000 MB/s in a browser test. DDR5-5600 typically shows 20,000 to 30,000 MB/s. If your score is significantly below these ranges for your RAM type, your XMP or EXPO profile may not be enabled in BIOS enabling it can double your effective RAM speed.
The most common reasons are: XMP or EXPO profile not enabled in BIOS (RAM defaults to base JEDEC speed, often half its rated speed), RAM installed in single channel instead of dual channel slots, background applications consuming memory bandwidth during the test, or JavaScript overhead reducing browser-measured speeds below hardware-spec speeds.
XMP (Extreme Memory Profile for Intel) and EXPO (Extended Profiles for Overclocking for AMD) are BIOS settings that activate your RAM’s rated speed. Without them, RAM runs at the base JEDEC speed which is typically much lower. To enable: enter BIOS at startup (usually Del or F2 key), find the memory or OC settings, enable XMP or EXPO, select your RAM’s rated profile, save and exit.
No. Browser based RAM tests measure speed and usage but cannot detect hardware level memory errors or faults. For fault detection, use Windows Memory Diagnostic (built into Windows), MemTest64 from TechPowerUp (free, runs within Windows), or MemTest86 (free, most thorough, boots from USB). Use these tools if you are experiencing crashes, blue screens, or data corruption.
Yes. The TechTester RAM tester works on macOS in Chrome, Firefox, Safari, and Edge. Total RAM and speed test results all display correctly. Note that Apple Silicon Macs (M1, M2, M3, M4) use unified memory shared between CPU and GPU their memory bandwidth is exceptionally high and will score significantly above typical DDR4 results.
Dual channel RAM runs two memory sticks in parallel, effectively doubling memory bandwidth. Your RAM speed test score in dual channel mode will be approximately double the score in single channel mode. Most motherboards require sticks in specific slots for dual channel to activate typically slots 2 and 4, not 1 and 2. Check your motherboard manual for the correct configuration.