Tested Memory Map 0 / 64 blocks

Free

Writing

Reading

Error

📦

Allocation

Reserves the memory block for the test

WAITING

✏️

Write

Writes bit patterns across the entire memory

WAITING

🔍

Read and Verify

Reads and checks every byte previously written

WAITING

🔄

Simultaneous Read/Write

Measures bandwidth with mixed operations

WAITING

🛡️

0xAA/0x55 Integrity

Alternating pattern for bit-fault detection

WAITING

Bandwidth (MB/s) 0 MB/s

Test Log

--:--:--Waiting for test to start...

Available RAM (est.)

—

via performance.memory

Write Speed

—

MB/s (peak)

Read Speed

—

MB/s (peak)

Total Bandwidth

—

write + read

Errors Detected

no faults

Block / Mode

32 MB

mode: quick

JavaScript Heap

Used—

Total—

⚠️

Important notice: This site and all of its tests are provided free of charge and on an experimental basis. We are not responsible for any damage, instability, crashing or overheating caused to your computer during or after running the tests. Use responsibly — if your system shows signs of instability, stop the test immediately.

How it works: Writing uses 4 simultaneous strategies — Uint32Array.fill(0xDEADBEEF), fill(0), Float64Array.fill(0) and fill(0xFFFFFFFF) — and reports the fastest. Native fill() is compiled by the JIT into the processor's memset/AVX instructions, measuring real bandwidth. Reading walks every element with Float64Array (8 bytes/access). RW uses f64.set(f64.subarray()), which V8 compiles into a vectorized memmove. A double warm-up primes the JIT before measuring. Close other tabs for more accurate results.

RAM Memory Test