1/23/2024 0 Comments Memory master ramThe reason that we’ve used only half of our four-DIMM kit thus far is that it won’t run all four DIMMs at DDR4-3600 and 1T, hence you’ll want to see the penalty of 2T before we add four-DIMM configurations to the mix." It makes sense that most people would shoot for 1T, except that higher data rates often make this unworkable, particularly when more ranks of memory are used (ie, two “double-sided” or four “single-sided” DIMMs). "Command rate is the number of cycles a command must be presented before a memory operation commences, so that 2T incurs an additional cycle of latency to every memory access. Traditionally when running 4 sticks in 2 channels, you are usually forcing the command rate to 2T rather than 1T, making the ram latency worse. And since those haven’t been produced for several years, we hopped in the wayback machine and grabbed a set from this 2015 test platform. To get 16GB from the same four ranks as our current 32GB set, we needed memory with identical capability but half the capacity. Doing so presents a different problem however, as four single-rank DIMMs will perform differently from two, even when the total capacity is the same. After all, two DIMMs of today’s main test kit have only 16GB, but four have 32GB. Capacity: Does More Memory Perform Better?Īs we prepare to compare the performance of two DIMMs to four, we thought we should first show how much performance difference there is between 16GB and 32GB. The difference could be little more than 2%, since numbers near a half-percent are either rounded upward or downward. We see a 3% penalty in 7-Zip for 2T timings at DDR4-3200, which makes a little more sense than the previous chart because a single cycle of extra time is a little longer at DDR4-3200 than at DDR4-3600. Is that greater boost enough to validate rumors that DDR4-3600 C16 and DDR4-3200 C14 are roughly equivalent? Shaving two cycles off DDR4-3600 C18 and DDR4-3200 C16 gives us DDR4-3600 C16 and DDR4-3200 C14, where the later should get a bigger boost since two cycles are a larger portion of sixteen than of eighteen. We started our tests by trying to equalize latency across every testing frequency, but that’s not going to cut it for ultimate performance. Five percent of a $1000 build is $50, and that’s typically more than the difference in price between DDR4-2800 and DDR4-3600.ĭDR4-3200 performance is dead center between DDR4-2800 and DDR4-3600, making the Ryzen 7 3700X appear “optimized” for a broad range of date rates rather than DDR4-3200 alone. And that’s total system performance, so if you use these apps, it might pay to spend a little extra on fast memory. The performance difference between our top and bottom benchmark set jumps to 5% in both F1 2017 and 7-Zip, and 4% in Ashes.
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