Timing for ram how does that work

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The intersection of rows and column numbers indicates a particular memory address. Row address to column address delay T RCD measures the minimum latency between entering a new row in the memory and beginning to access columns within it. Technically, it measures the latency between issuing the precharge command to idle or close one row and an activate command to open a different row. The same factors affect the latency of both operations.

Technically, it measures the latency between an activate command on a row and issuing the precharge command on that same row or the minimum time between opening and closing the row. These latencies do limit the speed of your RAM.

But RAM specifications set the limit, not physics. You may be able to get performance from your RAM by overclocking and tightening the timings by a couple of cycles. RAM overclocking is the most temperamental of hardware overclocking techniques, requiring the most freezes and experimentation. But faster RAM shortens the processing time for RAM-bound workloads, improving rendering speed and virtual machine responsiveness.

By signing up, you agree to our Privacy Policy and European users agree to the data transfer policy. As technology has improved, our chip designs have become far faster, but electrical complexity and board layouts might lead to higher timings. The way I see it? Finally, when command rate is increased from 1T to 2T, an extra clock cycle is required for every memory command. DDR does it in 18 cycles. DDR does it in 20 cycles. Shaving access time below that standard requires fewer cycles of latency per frequency, so that DDR C14 8.

For a CPU, waiting for every write or read to finish before starting the next would slow the process significantly. Interleaving is a method that allows one command to be started while the other is finishing.

What about the exceptions? One could of course look under the bottom edge of a heat spreader to determine whether certain modules have eight ICs on both sides: Whenever we spot something that deviates from the norm, we mention it in our reviews. Higher data rates improve performance, within the limits of a CPU and motherboard. Timings measure the time the memory chip delays doing something internally.

Here is an example. A memory module with a CL 9 will delay nine clock cycles to deliver a requested data, whereas a memory module with a CL 7 will delay seven clock cycles to deliver it. While both modules may run at the same clock rate, the second one will be faster, as it will deliver data sooner than the first one.

The memory timings are given through a series of numbers; for instance, , , , or These numbers indicate the amount of clock cycles that it takes the memory to perform a certain operation. The smaller the number, the faster the memory. The memory module portrayed in Figure 1 has timings, while the memory module portrayed in Figure 2 has timings. To understand them, bear in mind that the memory is internally organized as a matrix, where the data are stored at the intersection of the lines and columns.

Notice that not all motherboards allow you to change the memory timings. Also, some motherboards may not be able to run at very low timings, and they may configure your memory module to run at a higher timing setting because of this. Figure 3: Configuration of memory timings at the motherboard setup. When overclocking your memory, you may need to increase the memory timings in order to make the system run in a stable manner. Here is where something very interesting happens.

Due to the increased timings, the memory may achieve a lower performance, even though it is now configured to run at a higher clock rate, due to the latency that was introduced. That is another advantage of memory modules sold specifically for overclocking.