AIDA64's memory benchmark is the standard way to measure RAM performance, reporting four numbers: read, write, copy, and latency. They're often quoted when people compare memory kits or show off an overclock — but they don't all move together, and knowing which responds to frequency versus timings tells you what your tuning actually achieved. This article explains each AIDA64 memory number and what changes when you overclock RAM.
It connects to our guides on RAM overclocking (EXPO/XMP), latency vs frequency, and how memory timings work.
What Each Number Means
- Read / Write / Copy (bandwidth, in GB/s): how much data the memory moves per second in each operation. These reflect throughput and scale largely with memory frequency — higher-speed RAM posts higher bandwidth.
- Latency (in nanoseconds): how quickly the memory responds to a request. Lower is better, and it's driven by both timings (like CAS latency) and frequency together. See what those nanoseconds mean.
What Moves When You Overclock
This is the useful part. Raising the memory frequency (e.g. enabling EXPO/XMP, or pushing higher) mainly lifts the bandwidth numbers — read, write, copy go up. Tightening the timings (lower CAS and sub-timings) mainly improves latency — the nanosecond figure drops. Often you trade between them: a higher frequency can slightly loosen effective latency unless you also tighten timings, which is the heart of the latency-vs-frequency tradeoff. The first and biggest win for most people is simply enabling the rated EXPO/XMP profile, which lifts both versus running at default JEDEC speed.
Which Number Matters for You
It depends on the workload. Latency tends to matter for gaming and general responsiveness, while bandwidth helps certain bandwidth-hungry tasks. The sweet-spot kits (see DDR5 speed sweet spots) balance both. Don't over-fixate on one AIDA64 number — the real-world difference between a good tuned kit and an extreme one is often small.
Frequently Asked Questions
What do read, write, and copy mean in AIDA64? They're memory bandwidth figures (GB/s) for each operation — how much data the RAM moves per second. They scale largely with memory frequency, so higher-speed RAM posts higher read/write/copy numbers.
What lowers memory latency? Tighter timings (lower CAS and sub-timings), and to a degree higher frequency. Latency in AIDA64 is reported in nanoseconds and reflects both together — tightening timings is the main lever for reducing it.
Does enabling XMP/EXPO improve AIDA64 scores? Yes — running the rated EXPO/XMP profile instead of default JEDEC speed lifts bandwidth and improves latency, and it's the single biggest and easiest memory win for most people before any manual tuning.
The One Thing to Remember
AIDA64's memory test reports bandwidth (read/write/copy, driven mainly by frequency) and latency (in nanoseconds, driven mainly by timings). Overclocking frequency lifts bandwidth; tightening timings lowers latency — and you often trade between them. The biggest easy win is just enabling EXPO/XMP. Match which number you chase to your workload, and don't over-fixate — real-world gains from extreme tuning are usually small.
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