I want to understand how DDR4 RAM works in detail: What principles underlie data transfer, how is the clocking organized, and what advantages does the higher bandwidth offer compared to DDR3? Additionally, I'm interested in which factors influence latency and how that impacts overall performance. What do you think are the most important points to consider?
How does DDR4 RAM work and what are the differences compared to previous generations?
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Thanks for the detailed explanation, I now understand better why DDR4 has higher bandwidth and lower voltage. Which RAM timing values (e.g., CL) should we particularly keep an eye on in a gaming laptop?
A few months ago, when I upgraded my old gaming PC from DDR3 1600 MHz to DDR4 3200 MHz, it quickly became clear why the newer generation is not only faster but also more efficient. The principle remains the same—the "Double Data Rate" signal, which transmits data on both the rising and falling clock edges—but DDR4 uses four separate bank groups, allowing multiple accesses to be processed simultaneously without blocking each other. This increases the effective bandwidth despite nearly identical clock speeds because more data can be moved per clock cycle. In my tests, this was especially noticeable when loading large texture packs in games: load times were about 15% shorter, even though latency (CAS latency 16 vs. 9 in DDR4) was slightly higher—the higher bandwidth fully compensated for it.
As for latency, I found that it doesn’t depend solely on CAS ticks but is also influenced by the overall configuration: the memory controller, timings, and voltage. When overclocking my DDR4 kit, I lowered the CL values to 14 without stability issues, and the difference was particularly noticeable in memory-intensive tasks like video encoding. Bottom line: For most desktop setups, DDR4 is the better choice thanks to its higher bandwidth and improved power management features—as long as you keep an eye on the timings and optimize the controller configuration.