Excerpt from Michael Crider (How to Geek) Higher-quality, more expensive RAM has lower latency, and both this rating and the RAM’s clock speed can be overclocked by enthusiasts.
That being said, the differences in latency are so minuscule that unless you’re running industry-level server operations or multiple virtual machines, you’re unlikely to see any real difference between RAM with a higher or lower latency.
But What Does All This Do for My PC?
Honestly, it doesn’t mean a lot. While faster, lower latency RAM will indeed increase the technical performance of your computer, it works at such a fundamental level that it’s almost impossible for us flesh-and-blood humans to actually appreciate the difference. It’s like the comparing Data from Star Trek and C3P0 from Star Wars—if one can calculate the odds of survival in one billionth of a second and the other takes two billionths, does it really matter which one you ask?
Faster RAM will give your PC better performance in certain specific benchmarks, but in terms of actual benefit to most users, having more RAM available is almost always better than having faster RAM. So if you’re on the fence about purchasing 8GB of DDR4 RAM with a speed rating of 3200 or 16GB of DDR4 RAM with a rating of 2400, go with the second option every time. It also means that overclocking RAM in the system BIOS is rarely worth the effort. Faster RAM can help visual performance with computers that use an integrated GPU, like Intel’s non-discrete designs or AMD’s Accelerated Processing Unit series. That’s because this setup relies on system memory for graphics performance. It can also make a more obvious difference for machines that are constantly accessed from multiple points, like a high-traffic web server or a virtual machine host. But for most users, it just isn’t a big deal.
RAM comes in different generations, with updated standards allowing faster and faster access to the data stored in memory. The original DDR standard—short for “Double Data Rate”—succeeded Single Data Rate RAM way back in 2000, and we’re currently on DDR version 4. DDR3 RAM introduced in 2007 is still used in older or cheaper PCs.
Each successive version of DDR increased the memory bus and speed capabilities of the RAM module format, leading to increased performance. But what’s really important to remember is that the standards are not backward- or forward-compatible. If your laptop or motherboard is rated for DDR3 memory modules, it can only use DDR3, not DDR2 or DDR4. The physical slots for the different standards don’t even match, so it should be impossible to install the wrong DDR standard anyway.
A motherboard’s RAM slots can operate at speeds below their maximum without issue. So if your motherboard accepts DDR4 RAM at up to 3600MHz, but you’ve found a sweet deal on modules rated for a maximum of 2400MHz, feel free to install them.
Also note that your motherboard may not run your RAM at its advertised speed out of the box. If you buy DDR4-3600 RAM and your motherboard supports anything up to DDR4-3400, it may still clock it to the lowest setting by default—say, DDR4-3000. You’ll want to head into your computer’s BIOS and set it to the correct speed, either by enabling Intel’s extreme memory profile (XMP) or by adjusting the speed yourself.
Also note that installing non-matching RAM DIMMs (which have different speed and timing ratings) is generally OK—your motherboard is smart enough to handle the different hardware. But in each case, the system will clock down to match the slowest memory module it has access to, so buying faster RAM to mix with slower RAM doesn’t have any real benefit. Where possible, it’s best to match new RAM with old RAM.
https://www.howtogeek.com/303455/how-does-ram-speed-and-timing-affect-my-pcs-performance/
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