But that just means that DDR5-4800 CAS 40 can only be as quick as DDR4-2400 CAS 20, which would in turn still be laggier than the slowest DDR4-2400 at CAS 18. Of course, the latency situation for DDR5 isn’t as dire as that big number appears at first blush: Latency is specified in clock cycles, so that anything that cycles twice as fast requires half as much time per clock cycle, as outlined in our overview of how to buy the right RAM. Lower numbers, all things being equal, are better when you're talking about latency figures for memory. (Higher-data-rate DDR5 RAM has been announced, but good luck finding any at this writing!) With DDR4 CAS latencies below 20 in high-performing DDR4 memory, that "CAS 40" might sound concerning. Scalpers were even getting in on the proceedings.) And while we expect industry-standard DDR5 to eventually reach data rates as high as DDR5-6400, what’s currently available is DDR5-4800, with a sluggish-sounding CAS latency rating of 40. (Indeed, DDR5 of any kind, period, was scarce at this writing in late November 2021. Why is that? For starters, hardly any high-end (overclocked), performance-grade DDR5 has come available yet. In measuring memory speed, the two parameters we’re dealing with are bandwidth and latency, and early DDR5, so far, isn’t exactly blessed in the latency department. Real-world applications, however, often use a rapid succession of small transfers to and from memory, where the time it takes to open and close memory cells is at least as important as how quickly the data is transferred once those cells are open. (For a primer on the essentials of DDR5, see What Is DDR5? Everything You Need to Know About the Latest PC Memory Standard.) One thing we know about DDR5 is that it’s "faster" than DDR4 by the most commonly marketed numbers, but those numbers are just a measure of theoretical peak data rate. With Intel's "Alder Lake" 12th Generation desktop processors, we have the debut of a new memory standard in consumer PCs: DDR5, which is used by many of the motherboards that support the new chips.
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