If you are running an SLI setup, then scaling would improve beyond 3000, even at 3600 you still see gains with SLI. I would personally say 3000 C15 is "good enough" for almost everyone. Tertiary timings were identical (they are dictated by your board and IMC mostly, if IC's are identical) so the difference in performance was minuscule comparing 3000 C15 to C16. I've purchased the cheapest, most weakest Micron IC's, and managed to make 3000 C15 work on 3 out of 4 kits, with the last kit requiring 3000 C16 to work. With DDR3, relative XMP speed mattered due to how limited DDR3 was when manually overclocking, but this is no longer the case with DDR4. Different IC's prefer different tertiary timings, and even with identical clock speeds and primary timings, there can be a huge difference in bandwidth/latency depending on how your IMC and board train. This shows us nothing when comparing relative ram speeds. You are right however, when you say there is no need to divide clock speeds by timings. I am talking a good 10ns difference with just those two timings alone (ask happened to his kit after tweaking those two). Cas latency has a big impact on latency, there is no denying that, but you can get significant gains by tightening tRFC and raising tREFI. The lower your RTL/IO-L, the lower your overall latency. RTL (Round Trip Latency) is far more important, and factors in not only your primary timings and frequency, but even tertiary timings and command rate. Latency is dictated by far more than just CL. Instead of trying to multiply and divide random numbers hoping to get any meaningful result, you should look at benchmarks and decide based on that if paying a higher price for higher frequency is worth the performance difference. The price for higher frequency is (almost always) higher, and so is the performance. Still, if 3GHz CL15 was the same as 3.2GHz CL16 then the price of ram would be the same for both. Ideally we would have lower CL and higher frequency but in order to keep memory stable at higher frequencies the CL needs to be increased. Most programs, including games, perform better with higher frequency. Latency is CL, you do not need to divide by megaherts.Ĭertain programs perform better with lower CL. 15 cycles / 3000 Mcycles/sec = 0.000000005 secondsġ6 cycles / 3200 Mcycles/sec = 0.000000005 secondsīasically get the faster RAM if you had a choice between these two.
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